Engines with electric auxiliary pumps become more efficient, as they generate less excess heat and oil consumption. Even though not all vehicles have one yet, these pumps are growingly popular in modern, low-emission and high-output engines that have to run within a small temperature range in order to maintain their efficiency.

The usefulness of an auxiliary electric water pump

So, what is an auxiliary water pump? It is a secondary pump that plays a crucial role in maintaining engine efficiency and passenger comfort. These pumps can send hot coolant into the heater core regardless of the engine’s RPMs, providing hot/cold air to the cabin even when the engine is idling or off. The auxiliary coolant pump can continue to operate while the car has stopped, allowing coolant to circulate and fully dissipate the heat from the supercharger.

This type of water pump is essential for passenger comfort, since it allows for sufficient heating even when passengers are driving in traffic or at low RPM. Also, many modern cars use this second pump to allow you to use the air condition for a period while the engine is off. 

Note that unlike the main water pump, this one is not running all the time. The electronic control unit will regulate the auxiliary pump according to the needs of the moment.

To sum up, some of its unique advantages include:

• Facilitates demand-driven cooling of the vehicle.
• Saves on fuel.
• Enhances passenger comfort.
• Is efficient in cooling down power train components.
• Reduces emissions.

Auxiliary electric water pump diagram

Understanding the auxiliary electric water pump diagram is essential to grasp how this component integrates into the vehicle’s cooling system. This pump is typically located near the heater core or within the engine bay and operates as part of the broader coolant circulation system.

A standard auxiliary electric water pump diagram includes the following key components:

• Main coolant lines – Transport coolant throughout the engine.
• Heater core – Receives heated coolant to provide warmth to the cabin.
• Bypass hose – Allows the auxiliary pump to circulate coolant independently.
• Electronic Control Unit (ECU) – Regulates pump operation based on temperature and vehicle conditions.
• Electrical connections – Power and control the auxiliary water pump motor.

The pump activates based on inputs from the BCM (Body Control Module), ensuring coolant circulation even when the engine is off or idling. This contributes to passenger comfort, fuel efficiency, and optimal thermal management of powertrain components.

For a detailed diagram specific to your vehicle, always refer to the manufacturer’s service manual.

Related content: Peculiarities of an auxiliary water pump

Reasons to change your auxiliary electric water pump

The main reason these pumps fail is the electric motor’s natural age and wear. If this does happen, then the heater core will not be able to heat up and replacement will be necessary.

Within age and wear, there are 5 common ways in which electric auxiliary water pumps can fail:

• Weep hole is leaking coolant, indicating that the dynamic seal has failed. 
• The water pump leaking into the engine, making the oil milky and thin.
• Pump’s impeller fails and makes a chirping noise as it contacts the housing.
• The galleries in the water pump become plugged from sludge build-up.
• Electric motor fails due to a short in the wiring, making it inoperable.

Potential complications

A failed auxiliary water pump will almost never cause the vehicle to overheat. However, if inoperative, you might notice some of the following situations during driving:

• No warm air coming from the heater: since its primary job is to supply hot coolant to the heater core, the first symptom of a problem with this component would be no hot air blowing from the heater.
• Heater shows fluctuating heat: the temperature inside the vehicle is increasing or decreasing based on the driving mode, especially if there is a noticeable temperature decrease when the engine is idling.
• Windows defrost is not working: when windows fog up, the defrost mode is in charge of blowing warm air onto the windshield for clear vision. If the pump is failing, the windows will not defrost rather quickly.
• High-pitched buzzing sound: coming from under your dashboard, this might happen if there is an electrical short in the wiring, making the pump run faster than it should or continue to run after the engine is off.

How to replace an electric auxiliary water pump step by step

Once you have verified the condition of the electric auxiliary water pump and confirm its need for replacement, make sure to follow these steps one by one for an optimal replacement. Remember to always consider individual instructions proposed by the vehicle’s owner manual.  

Auxiliary water pump replacement step-by-step:

1. Drain the coolant from the system.
2. Remove any interfering parts, if necessary.
3. Disconnect the auxiliary water pump connector.
4. Remove all the hoses connected to the pump.
5. Remove all the mounting bolts and the auxiliary water pump.
6. Install the new auxiliary water pump and tighten the bolts.
7. Connect again the hoses back.
8. Install all previously removed parts in the reverse order.
9. Fill up the cooling system with indicated coolant to the required level.
10. Bleed coolant system according to the service manual.
11. Check coolant system for leaks.

And that’s it! You are done! 

Remember to always test drive the vehicle by driving it around and monitoring the cooling temperature!

Discover our range extension of Auxiliary Electric Water Pumps

The importance of proper selection of auxiliary electric water pumps

A good quality electric auxiliary water pump will determine the time span of an optimal coolant system and performance in any modern vehicle. These pumps are not only used to make modern engines efficient but have enabled the cooling of batteries in hybrid and electric vehicles.

With a complete range of auxiliary water pumps of more than 60 references, DOLZ offers its customers the best solutions thanks to personalized attention and the latest technology in the manufacture of water pumps for the aftermarket sector.

If you are looking for top-tier auxiliary electric water pumps, contact us and we will provide you with the information and support you need.

La entrada When and how to install an auxiliary electric water pump se publicó primero en Industrias Dolz.

In today’s article we talk about the top 5 mistakes in the installation of a water pump and how to effectively install this key element of the cooling system.

Keep learning: Understanding the water pump drive: Exploring its location and operation

Installing a water pump: Mistakes

1. Cooling System Preparation

One of the main and often overlooked problems is in the preparation of the system through which the water pump will circulate the coolant.

Before installing a water pump it will be especially important to flush, drain and refill the cooling system with the OE (original equipment) specified coolant mix. On the contrary, the correct operation of the new water pump would be jeopardized.

Dolz Tip: When preparing the cooling system, if you notice that the old coolant is very dirty, it is advisable to check the thermostat and replace it if necessary. If you’re unsure how to check thermostat car, ensure you follow proper steps, including inspecting the thermostat for signs of malfunction and verifying coolant flow behavior.

2. Improper mix of coolant and water

Another common error is found in contamination caused by the incorrect mix of coolant and water or its improper use. Contaminated or improperly mixed coolant can cause corrosion problems, the dreaded cavitation, and cause leaks between the two contact faces of the water pump’s dynamic seal.

When choosing the right coolant, it is essential to check the expiration date and follow the vehicle manufacturer’s recommendations, as each individual engine is made from different materials and has specific needs.

3. Incorrect use of sealing paste

The use of sealing paste in the water pump is only necessary in those that are supplied without a gasket. Otherwise, if we add sealant when it is not needed, we will cause any particle of sealing paste that circulates through the cooling circuit coming from the pump gasket, which may affect the functionality of the dynamic seal, preventing the correct sealing function and causing a failure premature of it.

Incorrect use of sealing paste will directly affect the life expectancy of the water pump. Therefore, unless specified or referenced without a gasket, avoid the use of sealants.

4. Water pump dry rotation

Another mistake to avoid during installation is dry rotation of the water pump.

When refilling the cooling circuit after replacing the water pump, many manufacturers recommend that the pump be turned by hand until it is full. This fine-tuning of the pump can reduce the possibility of loss of the “mechanical” seal since the coolant liquid reaches the component of the mechanical seal creating a film that will prevent its spillage.

Otherwise, if the pump runs dry, it will cause damage to the seal, which may lead to premature leaks or squeaking noise in the water pump.

5. Water pump and timing belt

One of the most common mistakes is to overlook the distribution when we are doing the installation of the new water pump. The water pump is driven by the belt transmission system, which means that combining the replacement of both systems improves the quality and the safety of the process, which is why it is a highly recommended practice.

Previously the replacement of these two components was carried out separately, but nowadays it is more and more common to carry out this operation at the same time. This allows better vehicle performance and longer average lifespan of the water pump.

If the timing belt and other related items are installed incorrectly, this will directly affect the performance of the water pump.

Relating Content: Discovering the main water pump components

Discover Dolz’s water pump range

We manufacture more than 5.5 million units per year over a range which comprises:

• Water pumps for passenger cars
• Water pumps for industrial vehicles
• Auxiliary electric water pumps
• Variable water pumps
• Electric water pumps

All our range has the ISO 9001:2015 certification, which means quality 100% tested. A process as simple as it is fundamental and for which, among many other factors, DOLZ water pumps are the pumps with the highest quality on the market.

Main characteristics of the range

• The DOLZ range is made of 1300 references, among which 990 for cars applications & 18% only for Asian applications,
• 95% coverage of the European car parc.
• 95% of the DOLZ range includes a Silicon Carbide Dynamic Seal, that guarantees optimum tightness and durability of the water pump,
• Water pumps designed according to OE specifications,
• Automatized manufacturing process that guarantees an excellent quality.

All of them have 100% cast aluminum material, resistant to wear and OE equivalent, always following the highest standards.

At DOLZ, we have been an expert manufacturer of water pumps since 1934. If you would like to find out more about our range of water pumps and other Dolz product lines, contact us!

La entrada Top 5 mistakes to avoid when installing the water pump se publicó primero en Industrias Dolz.

La entrada Failing car water pump: Signs se publicó primero en Industrias Dolz.

Temporary leakage: key aspects

First of all, it should be noted that the watertightness of all water pumps made by Industrias Dolz is checked by a calibrated machine which automatically detects It introduces air at 1 bar of pressure on the surfaces of the water pump which have been in contact with the coolant for a specific time. After a period of adjustment, it checks that the drop in pressure is less than 3.5 cm3 /min. That is why the pumps manufactured by Dolz do not leak under proper operating conditions.

Adequate operating conditions

To prevent future leaks and ensure the longevity of your cooling system, it’s essential to maintain it regularly and know what optimal conditions the coolant should meet:

1.- There must be no solid particles dissolved in the coolant of less than 0.5 mm.

These particles can get between the two contact faces of the dynamic seal and cause a temporary leakage in the water pump due to the imperfect coupling of the two friction rings. When the two contact rings of the dynamic seal are in constant rotation these particles can be expelled from them by the centrifugal force of the rotation.

2.- The main function of the spring which pushes the graphite ring against the silicon carbide ring is to balance the hydrostatic pressure of the coolant, keeping the two rings of the dynamic seal in constant contact. Temporary variations in pressure can cause a hydrostatic imbalance in the working area of the dynamic seal and produce a leak in the water pump.

For all these reasons, to avoid this phenomenon, there must be no air in the circuit. In addition, it will be necessary to check that the coolant in the expansion tank is between the maximum and minimum levels.

Cross section of dynamic seal

Coolant stains at the water pump outlet pipe

If you observe coolant stains by the water pump’s drain hole, you could think that the pump is leaking, but this phenomenon is normal. The two contact surfaces of the dynamic seal are in a state of constant rotation and friction. In normal working conditions allowed to permeate between them in proportion to internal pressure.

Under normal working conditions, a small film of coolant liquid is allowed to enter between them due to the internal pressure gradient. The coolant acts as a lubricating medium which reduces both the wear and the heat produced by the friction of the two contact surfaces. Normally the liquid evaporates before reaching the last of these contact rings, thereby not producing any leakage from the seal.

What to do if you observe small temporary leakage stains from the water pump

• If there are small coolant stains near the water pump drain hole you may feel that the pump is leaking.
• When small amounts of coolant, normally less than 10 cc, are coming from the water pump´s drain hole must check that there is no air in the circuit and there are no residue particles in the car´s coolant expansion tank.

If you carry out these operations and the leakage persists, then you must remove the water pump to be analyzed at the factory.

Related content: Emerging Car Brands | DOLZ x BYD DR EVO GEELY MG 

Dolz, without limits

At Industrias Dolz we guarantee the quality of our products through the different phases of their production. Our extensive experience as manufacturers of water pumps together with the constant improvement and innovation of our production processes allows us to ensure the perfect adaptability of our products.

In this way, we ensure that the water pumps comply with all existing regulations for adaptability and functionality, always equivalent to OE Quality (art. 1 EC Category Exemption Regulation 1400/2002).

La entrada Temporary Leakage: water pump Inspection and Diagnostic Tips se publicó primero en Industrias Dolz.

Heavy vehicles such as trucks or industrial vehicles involve large engines and therefore generate a large amount of heat. That is why the cooling system is considered a key element for good engine performance. Overheating can increase the risk of engine damage, so it is essential to ensure that the engine does not experience additional stress due to extremely high temperatures.

Keep reading to learn more about electromagnetic truck water pumps, their variable operation and how they differ from traditional mechanical water pumps.

What is an electromagnetic water pump?

There are different ways to regulate the coolant, some of them are carried out by an electro hydraulic actuator, or a belt drive, also by electrical activation on the water pump back housing (thermostat) or also by an electromagnetic coupling.

In relation to the last one mentioned, the use of this electromagnetic technology has spread to form part of systems such as vehicle air conditioning or engine cooling system, meeting the growing demands for efficiency and flexibility in engine performance.

A key component of any water pump is the impeller, responsible for moving the coolant through the system. But what is impeller in pump technology? The impeller is a rotating component with vanes or blades designed to increase fluid pressure and flow. In an electromagnetic water pump, the impeller’s operation is optimized by the electromagnetic clutch, adjusting the coolant flow based on engine demand.

The main difference between a mechanical water pump and one that has the EM (electromagnetic) clutch is that this electromagnetic clutch system can automatically adjust output flow of the water pump more meets the demand of motor. On the other hand, the traditional water pump will circulate the coolant in a fixed and constant way because its speed is directly connected to the speed of the engine.

How does the electromagnetic clutch work? 

In an electromagnetic clutch, the pulley (rotor) is independent of impeller. The connection between both elements is achieved by pressing two friction elements using an electromagnet.

When this electromagnet is activated, the clutch engages, and both the rotor and the impeller rotate together. Without current, a spring separates the friction elements leaving the rotor free of the system. Clutch system control is performed by the engine control unit (ECU) using thermal sensors located on the engine.

To guarantee a minimum flow of the pump when the electromagnetic clutch is deactivated, a second magnetic clutch is fixed to the rotor. This second clutch does not guarantee joint rotation between both components, but it guarantees a 50% and 60% of the flow between them when there is a friction coupling.

In most situations, this flow is enough to keep the engine properly cooled and to have this type of clutch, which has no friction or contact between the rotor and the impeller, significantly reducing power consumption and besides fuel consumption. Only in some situations as per example high outside temperatures, a 100% flow is necessary and, in those cases, the electromagnet will activate to generate a total coupling by friction.

For all the above considerations, its main advantages are:

1. 1. Reduces fuel consumption.
   2. Provides greater flexibility thermal management.
   3. Reduces system inertia and increases tolerance to changes in revolutions.

• Guarantees minimum flow for normal circuit operation if an electrical system failure occurs.

*V501 Dolz electromagnetic water pump for truck

Related content: Truck water pump: How to select the correct one?

Main components of the EM clutch

• The rotor, the pulley, the element that is in contact with the belt fixed to the water pump.
• The static friction ring, attached to the rotor, and the spring-loaded secondary friction ring, engaged to the impeller through the inner shaft.
• The electromagnet, attached to the water pump, which acts on the spring-loaded friction ring and engages it on the static ring. And then, there is a secondary magnetic clutch magnets.
• The secondary clutch armature ring, over the magnets.
• Heat dissipation system

Dolz Electromagnetic Water Pump

Industrias Dolz has been manufacturing and distributing high-quality water pumps for passenger cars, commercial & industrial vehicles since 1934.

Among the strengths of Dolz water pumps are:

• Full in-house production …All in Dolz
• Self-lubricating silicon carbide (SiC) seals, with HNBR rubbers and synthetic graphite contact rings to increase durability and guarantee performance.
• OE equivalent.
• ISO 9001:2015 Quality Management System
• All water pumps are supplied with the necessary fittings/gaskets.

Dolz has a manufacturing plant built on an aera of 25,000 square meters focused on innovation and market demands, automation and robotization in production processes and logistics efficiency. It manufactures more than 100,000 automotive water pumps per week and has a permanent stock of more than half a million water pumps.

Keep reading: …All in Dolz. In-house production end to end.

Contact to discover more about our full range of electromagnetic water pumps and other Dolz product lines. 

La entrada Electromagnetic water pumps for truck se publicó primero en Industrias Dolz.

Main uses and functions of secondary water pumps in vehicles

Secondary water pumps, also known as auxiliary pumps, are the star component in upsetting any vehicle’s cooling system. Even though not all vehicles have one (yet), these pumps are growingly popular as engines become more efficient and generate less excess heat. 

This type of pump is not connected to the main engine cooling system, so it is not running all the time. Instead, it provides supplementary coolant that circulates through a bypass hose to the heater core when needed. Additionally, it guarantees the cooling of the electric motor, and the inverter that electric and hybrid vehicles have.

Secondary water pumps keep the coolant flowing even when the engine is not running, ensuring there is always enough volume of coolant to keep the heater core warm. This enables vehicle engineers to use larger heater cores, allowing for the following features:

Improve driver comfort

Some types of engines, such as diesel-power ones, do not generate great amounts of heat when running or idling. This means that in lower engine speeds, the coolant in the heater core might lose its heat before being passed through the outlet. Adding a secondary coolant pump secures optimum heating even at low speeds.

This is important for passenger comfort, since it allows for sufficient heating even when passengers are driving in traffic or at low RPM. Moreover, an auxiliary water pump can also keep the cabin heated for short periods of time, even after the driver has turned off the ignition.

Maintain battery temperature

Thermal management poses a singular challenge in fully or partially battery-powered vehicles. Modern vehicles with hybrid drive and stop/start systems use batteries that must be kept at a certain operating temperature of engine to remain efficient in the long term. This is where auxiliary pumps come into play, for example to cool down the turbocharge.

The intelligent thermal management in these vehicles relies on several auxiliary pumps, which are turned on by the ECU when needed for a more targeted cooling. These pumps are individually adjustable; each of them is responsible for cooling a different area and can fail or be replaced without affecting the others.

Related content: When and how to install an auxiliary electric water pump

Signs and causes of failure in the secondary water pump

The main reasons why a secondary water pump fails are:

1. Fluctuating heating performance
2. Buzzing sound under the dashboard
3. Age and wear
4. Overheating
5. Low or bad coolant
6. Defective pump or improper installation

Keep reading to know more in depth about them:

1. Fluctuating heating performance

If the secondary water pump in a vehicle is inoperative, it will most probably lead to reduced or fluctuating heater performance at low speeds and at idle. This might also affect window fog, resulting in the defrost mode not working.

2. Buzzing sound under the dashboard

If there is an electrical problem with the secondary coolant pump, the pump might run faster than it should or continue to run after the engine is turned off. This will occasionally result in a high-pitched buzzing sound.

The sound indicates an electrical short in the wiring that powers the engine auxiliary water pump and is a key indicator of a need for replacement.

3. Age and wear

Like all moving and rotating components, brushes wear and windings short. The most common cause of water pump failure is simply from age and wear of its electric motor. Over time, most parts in a car or truck, auxiliary pumps included, start to break down due to constant wear and tear. 

4. Overheating

Overheating issues might affect any water pump’s lifespan. Too much heat in the engine can cause problems with the coolant system. Overheating can hasten the auxiliary water pump’s failure because increased cooling system pressures can force coolant past the shaft seals.

5. Low or bad coolant

Low coolant can cause a pump to fail. If too little coolant is circulating through the circuit, the blower fan will pull enough heat out of the coolant and cause the heater core to get cold. Furthermore, if the fluid in the cooling system is not properly maintained or if it is mixed with improper fluids such as water, corrosion will occur, reducing pump efficiency.

6. Defective pump or improper installation

A defective or improperly installed auxiliary pump will, at some early point, start showing the malfunctioning symptoms outlined in the previous section. Investing in a quality and compatible brand, as well as paying attention to all individual specifications of assembly will ensure the correct functioning of the vehicle’s cooling system.

You may like: Peculiarities of an auxiliary water pump

Guaranteed auxiliary water pumps with a trusted supplier

Industrias Dolz, with almost 90 years of history, is a leader in the manufacture of water pumps. From mechanical and electrical water pumps to variable and auxiliary water pumps.

Currently our range of auxiliary electric water pumps offers more than 70 references, all of them now available, which allows us to cover most of the current fleet of vehicles, fully covering the needs and demands of our customers and allows us to continue expanding our range of products.

This year we launched 28 new references of our auxiliary electric water pumps.

The new secondary water pump references cover the demands of more than 850 vehicle models from brands such as Mercedes-Benz, Audi, BMW, Ford, Porsche, Jaguar, or Opel.

If you want to know more about them, check this post!

And if you are looking for top-tier auxiliary electric water pumps, contact us and we will provide you with the information and support you need.

…yes we have!

La entrada Common causes and symptoms of secondary water pump failure se publicó primero en Industrias Dolz.

Where a car’s engine is housed, there are several systems in charge of making it work as it should. Among them, the cooling system where the engine water pump is a key component, helps to lower the excessive temperature of the engine dissipating excess heat.

Find out everything you need to know about the water pump, what role it plays in your engine, and how to choose the correct water pump to ensure efficient driving.

What does the engine water pump do?

Simply put, an engine water pump is at the heart of an engine’s cooling system (without it, the system would not be able to fulfill its purpose). Thanks to the water pump, which operates together with the thermostat and the radiator, it is ensured that the engine block maintains the correct temperature, preventing overheating and optimally completing combustion.

As we’ve seen, the job of the engine water pump is to circulate coolant that absorbs heat, the full circuit being receiving coolant from the radiator and sending it through hoses to the engine. Once it reaches it, the coolant liquid absorbs heat and goes back to the radiator, where it’s cooled so that the cycle can start again. All this allows the combustion engine to reach its intended service temperature as soon as possible and maintain optimal conditions in different load situations.

Thus, the water pump is essential for the proper functioning and durability of the cooling system and the overall operation of the engine. It’s important to ensure that this system has the best possible quality and therefore contributes to good thermal management of the engine.

Basic parts of an engine water pump

A water pump consists of several key components, each playing a crucial role in ensuring the efficient circulation of coolant throughout the engine. Below are the basic parts of water pump and their function:

• Impeller: It is a rotor that increases the pressure and flow of liquid inside a water pump. The impeller is the heart of a water pump, and without it, the entire system can fail. There are different impeller types, each designed for specific applications to optimize efficiency and durability.
• Housing: responsible for protecting the water pump from external damage, as well as preventing the coolant from leaking out of the circuit and damaging the engine. They can be made from aluminum, cast iron or steel.
• Spindle bearing: it represents the mechanical support enabling the shaft to move continuously and steadily. It receives the turning force from the pulley and transfers it to the next component in line, which is the impeller. 
• Hub or Pulley: it acts as the power source for the impeller, thus generating the rotation forces needed to the engine water pump to function.
• Seal: it’s in charge of preventing leakages and avoiding bearings from being contaminated. It plays an important role in keeping the water pump intact.

Related content: Discover the main parts of a car engine (and its functions)

The relationship between the water pump and the engine

The purpose of the water pump is to counteract the increased heat produced by the engine. It would not be possible to dissipate the excess heat generated by combustion or to cool it faster and more efficiently without a water pump in the cooling circuit.

All in all, the performance of the different parts of the engine and the water pump is intrinsically connected: the power consumption of the water pump thereby increases in line with the engine speed. In fact, if your water pump stops working, your engine could fail.

Understanding the engine cooling system 

A typical engine cooling system comprises the following components: 

• Radiator, which acts as a sort of heat exchanger through the use of many fine tubes in charge of receiving and cooling the liquid sent from the engine. Radiators pass excess heat into an airstream, effectively cooling the liquid that is then returned to flow back into the channels. 
• Water pump in charge of circulating coolant. As we’ve seen, it’s driven by pulley and belts from engine crankshafts. It will send coolant down through the radiator, assisting in the circulation of the coolant.
• Thermostat, in charge of adjusting the level of coolant that will later circulate into radiator.
• Fans, driven by belts, it is responsible for pulling out air through the radiator.
• Hoses, where the coolant circulates.
• Coolant, the liquid in charge of absorbing heat from the engine and circulating through the whole cooling system. It is highly recommended to always use the antifreeze that’s recommended by your car manufacturer and never use water.

Keep reading: Engine cooling system: how it works and main components

Expert manufacturers of engine water pumps

One consideration to keep in mind after what we have seen in this post is that the process of choosing the right water pump brand can make a difference in engine efficiency and durability.

At Dolz we produce and distribute quality water pumps for passenger cars and industrial vehicles as part of the independent aftermarket. 

As such, we’re in charge of manufacturing more than 5.5 million water pump units per year. Our water pump catalogue includes 1,300 references: 900 for passenger cars (of which 230 are specifically for Asian applications, and another 200 for hybrid and gasoline cars) and 400 for trucks (trucks, vans, tractors, 4×4, 4×5, 4×6, 4×7, 4×8, 4×9, marine applications, forklifts, industrial engines).

Get in touch with us and discover our full range of products. 

La entrada Engine water pump: what does it do and why it’s a key component se publicó primero en Industrias Dolz.

New additions include water pumps for Ford, Buick, Chevrolet, Pontiac, Lincoln, Chrysler and RAM american applications.

Click and Download the full information!

Dolz USA Range PDF

About Dolz

Trusted for 90 years, Dolz (a member of Litens Automotive Group) has been a leading manufacturer and supplier of cooling products and timing drive kits for the automotive aftermarket.

With presence in more than 70 countries around the world and three factories in Spain (Castellón), Argentina (Buenos Aires) and China (Shouzou). Once again at Dolz we combine the latest technology with coordinated planning and flexible production, which allows us to provide the best possible service and quality.

We’re committed to helping our customers find the best solutions. If you have any questions, please contact us.

…yes we have it!

La entrada USA RANGE: Dolz water pumps for the North American Aftermarket se publicó primero en Industrias Dolz.

In today’s article we explore the effects of pump impeller cavitation, and we also talk about the preventive measures that must be taken against this phenomenon and keep water pump in safe working condition.

The impact pump impeller cavitation

Pump impellers can tolerate a small amount of low energy cavitation without damage or significant reduction in life. The more intense the cavitation is, the quicker the water pump will be damaged.

In other words, cavitation causes pump performance deterioration, mechanical damage and erosion to the impeller as we can see in the following pictures (which can ultimately lead to pump failure).

The impeller is one of the key components of a water pump, essential for its efficiency and performance within the cooling circuit. But what is impeller in pump? The impeller is the rotating component responsible for moving coolant efficiently through the system, ensuring optimal engine temperature and preventing overheating.

Keep reading: The importance of the water pump impeller

There is also the possibility of material release from the blades and even from the volute as well.

Under normal conditions, the impeller of a water pump do not show any deterioration and can only be encrusted with settled solids build-up on their blades.

Are there any signs of failure on the vehicle?

The answer is Yes, but we must address a few explanations first to understand what cavitation is and how it affects the operation of the cooling system.

The first issue to highlight is that any liquid and in general any material can exist in liquid, solid or gaseous state. In this case, the coolant state basically will depend on two parameters: pressure and temperature (during a phase-change process, both are dependent properties).

By decreasing the pressure of the coolant liquid to the same temperature, the liquid will turn into a vapor state. And vice versa, if we increase the pressure of a gas, it will become a solid.

The coolant circulates throughout the engine coolant circuit. This is a closed-loop and sealed system by the radiator cap or the expansion tank cap.

When we start the vehicle’s engine, the heat from the turbocharger and the engine cylinder head heats up the coolant and thus the pressure in the circuit increases. At that moment, two situations can occur:

1. If the pressure of 1.0 bar is exceeded, the circuit pressure is relieved by opening momentarily.
2. If the cap does not close the cooling circuit, the pressure automatically decreases (being atmospheric).

How is cavitation done?

Cavitation in the water pump happens in two phases. Initially, the coolant exposed to high temperatures begins to evaporate and forms the bubbles that constantly burst into the coolant that circulates through the water pump.

The process that initiates cavitation is a sudden pressure drop and/or coolant temperature increase, that is: rapid changes in pressure. This occurs when the coolant liquid passes from the suction side of the impeller, and the pressure decreases, the liquid molecules turn to vapor. But when the impeller increases the speed and transfers the energy of that vapor, this vapor becomes coolant liquid again. Ejecting (in an explosive way) bubbles that collapse, creating an intense shockwave that hits the impeller and creates pump vibration and mechanical damage as we have observed previously.

How to prevent pump cavitation?

By preventing cavitation, you will significantly increase the efficiency and lifespan of your water pump. Among the main causes of cavitation in cooling systems is the incorrect use of coolant.

To avoid it, it is important to maintain the appropriate coolant fluid level, as well as always use the coolant fluid recommended by the car manufacturer. It is also important to inspect the condition of the water pump or thermostat through preventative maintenance.

Related content: Coolant guide. Suitable coolants for the vehicle.

At Dolz we also recommend that, if you see the impeller has material loosening, do not replace just the water pump, replace also the radiator cap or the expansion tank cap in the same operation.

In conclusion, good design to avoid cavitation is always the best option. Dolz water pumps have excellent certified quality, equivalent to the original equipment manufacturers. Our commitment to Quality, Service and Innovation has been amply demonstrated for decades, been recognized as one of the leaders in the manufacture of water pumps in Europe.

If you need any help identifying which components you need for your system or further information about Dolz’s water pumps for passenger cars, heavy duty or commercial vehicles, don’t hesitate to contact us at dolz@idolz.com.

Don’t compromise on quality!

La entrada An overview to pump impeller cavitation se publicó primero en Industrias Dolz.

In today’s article we focus on the keys that will extend the service life of your spares, enhancing performance and durability.

Does quality matters for lorry spare parts?

First, it is essential to know that spare parts play a crucial role in maintaining the safety and proper performance of equipment. Reliable spare parts can help to increase fuel efficiency. This means you will save on fuel costs over time and quickly offset the upgrade cost.

In order to prevent potential failures and prolong the lifespan of the equipment it is always necessary for you to try and maintain your lorry in good condition. Regular replacement of worn or damaged parts can prevent potential accidents and prolong the lifespan of the vehicle.

One of the key reasons for always choosing quality lorry spare parts is because the failure of the lorry lead to high costs for the driver or the company. So, there are certain considerations that should be taken into account when it comes to purchasing spare parts:

• Compatibility: Placing a faulty part number in a lorry can cause damage to other components. That’s why the component should be compatible with the application and handle the load capacity it requires. This includes checking the size, weight, and other specifications of the part to ensure it will fit and work properly.
• Quality: When buying lorry spare parts, one of the mistakes is sacrificing optimum truck performance and safety for a modest price difference. Spare parts should always meet industry standards and specifications to ensure a longer lifespan and the best possible performance.
  By buying OE equivalent quality replacements for your lorry, you are ensuring that it will be designed to fit exactly as it should. The manufacturer will meet the required specifications and have been rigorously tested.
• Warranty: The warranty should be one of the most important factors to consider when making a purchase decision. The spare part should come always with a warranty, giving the customer peace of mind and protection against any potential defects or issues. Its purpose is to protect you, the purchaser, from receiving an item that contains a manufacturing flaw.

Furthermore, never underestimate the importance of customer service when buying any type of product. A good customer service implies the company is ready to accommodate the needs and requirements of their clients, but also can provide guidance in terms of operation, maintenance, or replacement of parts.

What is the importance of lorry maintenance?

Carrying out truck maintenance is vital for several reasons and should never be underestimated.

• It will save you money improving truck’s fuel efficiency.
• It helps to keep your truck in good working condition. This means that you can avoid breakdowns and expensive repairs. (A well-kept vehicle will last longer.)
• It can help you avoid safety hazards. The most important reason for having a truck maintained is safety.

Related content: DOLZ New-to-Range. June 2023

DOLZ water pumps for industrial vehicles

Dolz water pumps combine excellent certified quality, equivalent to Original Equipment, with maximum standards and reliability, for optimal performance of the vehicle’s cooling system.

With a complete range for industrial vehicles, Industrias Dolz covers the main applications for the following segments:

Truck – Vans – Tractors – 4×4 to 4×9 – Marine applications – Forklifts – Industrial engines

Dolz has a manufacturing plant, built on an area of 25,000 square meters oriented to innovation and market demands, automation and robotization in production processes and logistics efficiency.

Besides, our commercial team is constantly committed to offer a comprehensive service to all our clients in assisting them on finding the right part.  So, if you need quality spare parts for trucks or tractors and have doubts about our product lines, don’t hesitate to contact our team by sending an email to dolz@idolz.com.

Before you go, you can browse in our Truck water pumps eCatalogue. In this easy-to-use catalogue, specifically designed for industrial vehicles, you can search by product application, part number, reference, OE number or brand. Besides, you will find individual downloadable product data sheets for specifications.

La entrada Top Quality Lorry Spare Parts: Enhancing Performance and Durability se publicó primero en Industrias Dolz.