Dolz continues to strengthen its commitment to quality, innovation, and excellence in the aftermarket by incorporating Litens tensioners into its belt kits. This enhancement delivers an even more comprehensive solution by bringing together, in a single product, the expertise and engineering know-how of two leading manufacturers in the automotive industry.

With this upgrade, aftermarket professionals will benefit from belt kits that combine the renowned quality of Dolz components with the technology and expertise of Litens, the inventor of the automatic belt tensioner and an original equipment supplier to the world’s leading vehicle manufacturers.

The integration of Litens tensioners is part of Dolz’s continuous improvement strategy and reflects its commitment to further raising the quality standards of its product portfolio. The result is a solution engineered to provide precise operation, enhanced durability, and outstanding performance throughout the belt drive system.

“The incorporation of Litens tensioners into our belt kits represents significant added value for our customers. Through this integration, we are delivering a solution that meets the highest standards of quality and performance,” said Jesús Dolz, CEO of Industrias Dolz.

This development has been made possible through Dolz’s integration into Litens Automotive Group, creating synergies that bring original equipment expertise, technology, and quality standards to the independent aftermarket.

The kits will continue to reflect the philosophy that has always defined Dolz: helping distributors and workshops with complete repair solutions, reducing installation time, and delivering confidence in every repair.

With this latest enhancement, Dolz further reinforces its commitment to innovation and product quality.

For more information about Dolz belt kits featuring Litens tensioners or to learn about the available part numbers, please contact your local Dolz sales representative.

About Litens Automotive Group

Litens Automotive Group is a global automotive technology supplier and a world leader in the development of power transmission systems. As the inventor of the automatic belt tensioner, the company supplies original equipment solutions to the world’s leading vehicle manufacturers. With a global presence and decades of engineering and innovation expertise, Litens brings the same OE technology, quality, and performance that define its original equipment products to the aftermarket.

La entrada Dolz Introduces Litens tensioners into its belt kits to deliver a Premium-Quality Solution se publicó primero en Industrias Dolz.

As part of Litens Automotive Group, Dolz leverages decades of experience and know-how in belt drive systems, combining Litens’ innovation and technical rigor with Dolz’s ability to deliver robust, reliable products perfectly suited for the aftermarket.

Tensioners not only guide and redirect V-belts or poly-V belts but also maintain optimal tension at all times, absorbing fluctuations caused by load changes in the engine and auxiliary systems. Their advanced design prevents vibrations and premature wear, even over long runs without belt overlap.

The launch of this line is part of Dolz’s growth strategy, focused on expanding its range of complete and competitive solutions for industry professionals. Like the entire Dolz range, these tensioners are manufactured through controlled, ISO 9001-certified processes, ensuring maximum quality and reliability in every component.

Download the Complete Truck Tensioner Range

Dolz provides a comprehensive PDF Catalog with all Truck Tensioner and idler references, applications, and product photos. This catalog is designed to help distributors, mechanics, and fleet operators quickly find the right part for their vehicles.

About Dolz

Dolz, part of Litens Automotive Group, has decades of experience in producing premium belt drive components. With a focus on innovation, performance, and durability, Dolz offers an extensive range of heavy-duty truck tensioners designed for industry professionals worldwide.

La entrada Dolz launches 75+ new Truck Tensioner references for heavy-duty vehicles se publicó primero en Industrias Dolz.

Spain, December 2025 – Industrias Dolz, a manufacturer with more than 90 years of experience in developing water pumps for the aftermarket, expands its product portfolio with the launch of a new range of Crankshaft Damper Pulleys designed to deliver optimal performance, increased durability, and a significant reduction in engine vibrations.

With more than 130 new part numbers this new range covers the most in-demand vehicle applications, including versions for gasoline engines, diesel engines, and viscous dampers for high-torque diesel engines (more than four cylinders).

Driven by OE Heritage

Thanks to Litens’ long-standing experience as an Original Equipment (OE) supplier, Dolz offers crankshaft damper pulleys developed with the same engineering standards demanded by vehicle manufacturers.

Each Dolz crankshaft pulley undergoes rigorous durability testing and includes all components required for a quick and easy installation, such as crankshaft bolts and fixing washers.

The manufacturer also highlights key advantages over competitors, as the product offers superior balance and outstanding technical performance:

• Resonance frequency: within ±10% of the OE pulley.
• Torsional performance: within ±10% of the OE part.
• Durability: validated through rigorous testing.
• OE quality: engineering and precision developed to vehicle manufacturers’ standards.

“With the addition of Crankshaft Damper Pulleys, we reinforce our goal of offering an increasingly comprehensive range of drive solutions for aftermarket professionals,” says Andrea Taverna, Dolz Commercial Director. “Our expertise, combined with Litens technology, enables us to guarantee products of the highest quality and performance.”

The new Dolz Crankshaft Damper Pulleys are now available through the standard distribution network and the Dolz electronic catalogue, as well as on TecDoc.

More information: www.idolz.com
Contact: dolz@idolz.com

La entrada Dolz’s new crankshaft pulleys now available se publicó primero en Industrias Dolz.

Throughout Sustainability Week, Dolz launched a diverse range of initiatives aimed at engaging employees at every level. The goal was to raise awareness and encourage the adoption of sustainable habits both at work and in everyday life. These activities not only focused on environmental stewardship but also emphasized personal well-being and community involvement, reinforcing Dolz’s holistic approach to sustainability.

Employee Engagement: The Heart of Sustainable Transformation

Throughout the week, employees took part in a range of engaging activities focused on health, environment, and awareness, including:

• Daily fruit baskets to promote nutrition and healthy habits at work.

• Yoga classes, reinforcing the importance of physical and mental balance,

• Interactive recycling workshops, educating staff on waste separation and circular economy practices.

• Community clean-up challenge, where teams collected litter in surrounding areas to reduce local environmental impact.

• Planting of shrubs and greenery within company grounds, contributing to biodiversity and greener workspaces.

• A book swap corner, encouraging the reuse of materials and sharing of knowledge among colleagues.

This initiative is part of Dolz’s broader sustainability strategy, fully aligned with the environmental and social values of the Litens Automotive Group. The success of the first Dolz Sustainability Week sets a strong precedent. Going forward, Dolz plans to integrate similar initiatives regularly throughout the year and further embed sustainability into every layer of its organization—creating lasting value for people, the planet, and the aftermarket industry as a whole.

Sustainability in the Automotive Industry: A Strategic Approach to ESG in Manufacturing

“Sustainability in the automotive industry is no longer an option—it’s a responsibility,” said Jesús Dolz, CEO of Dolz. “This week has shown how small actions, when shared across a team, can lead to meaningful impact.”

With a strategic focus on People, Planet, and Performance, Dolz continues to advance its ESG roadmap—investing in innovation, environmental impact reduction, and employee engagement to help build a more sustainable and resilient future.

On the Road to Sustainability: An Inspiring Conversation

On the Road to Sustainability features an insightful conversation between Andrea Taverna, Commercial Director, and Javier Gascó, Purchasing Director, as they reflect on Dolz’s journey toward sustainability and share their vision for the future.

From prioritizing people to minimizing environmental impact and fostering innovation, their dialogue reveals how sustainability is redefining the automotive industry’s path forward.

What does it truly mean to be a sustainable company today? How crucial is the role of people in driving this transformation?

Join this engaging conversation on conscious leadership, meaningful change, and the commitment to building a more sustainable future.

La entrada Dolz reinforces its commitment to Sustainability in the Automotive Industry se publicó primero en Industrias Dolz.

Industrias Dolz presents its latest in-house development: the A255VD switchable pump (OE 04L121011), equipped with the innovative SHC (Switchable Hydraulic Control) technology and protected by a global DOLZ-exclusive patent.
This new variable pump is designed to meet the demands of modern engines, intelligently managing engine cooling through a switchable hydraulic control system. Thanks to SHC technology, thermal efficiency is optimized, reducing fuel consumption and harmful emissions.

The A255VD reference covers a wide range of VAG Group vehicles, with key applications in brands such as Volkswagen, Audi, SEAT, and Skoda, equipped with 1.6 and 2.0 TDi engines.

After successfully passing stringent performance, sealing, and durability tests at our facilities, the pump has also been tested under real-world driving conditions by installing the A255VD in compatible vehicles.
Following several months of intensive use, results have been outstanding, confirming not only the reliability of the design but also its excellent performance in real driving scenarios. This additional validation phase further strengthens market confidence in the quality of the company’s proprietary developments.

The A255VD switchable pump is now available—a 100% Made by DOLZ product, the result of the joint efforts of our R&D team and the company’s strong commitment to technological innovation and continuous improvement.

With this new addition to its product range, DOLZ reinforces its commitment to quality, efficiency, and the development of proprietary solutions that add real value to the aftermarket.

About Industrias Dolz

With more than 90 years of experience, Industrias Dolz is a leading manufacturer of water pumps, timing kits, and engine components for the automotive aftermarket. Present in over 70 countries, it is part of the Litens Automotive Group, a global benchmark in belt drive systems and thermal solutions.

Before you go, don’t miss out! Download this month’s New to Range with over 53 fresh references– just one click away!

La entrada DOLZ A255VD Switchable Pump with Patented Technology se publicó primero en Industrias Dolz.

The Commission presented Europe’s new 2030 climate targets, including a proposal for amending the Renewable Energy Directive, on 14 July 2021. It sought to increase the 32% target to at least 40% renewable energy sources in the EU’s overall energy mix by 2030.

DOLZ’s robust investment and growth strategy play a significant role in the energy transition and the systematic decarbonization, aiming for net zero by the year 2040.

Our purpose gives us a vision to aspire to, but turning it into reality requires a clear plan. To build on this progress, Dolz has set a bold goal: sourcing 100% of our energy from renewable sources by 2028. This transition follows a structured plan:

• 2025: 25% of our total energy consumption will come from renewable sources, marking the first major milestone in our transition.
• 2026: We will double this share to 50%, significantly reducing our dependence on non-renewable energy.
• 2027: Our renewable energy usage will rise to 75%.
• 2028: We will achieve 100% renewable energy—two years ahead of our initial target.

By accelerating our shift to clean energy, we are reinforcing our long-term commitment to sustainability, lowering our carbon footprint, and contributing to a greener future for the automotive industry.

Beyond our own operations, we are also working with our global suppliers and partners to drive emissions reductions throughout our supply chain, addressing all ‘Scopes’: 1, 2 and 3 and reinforcing sustainability as a core value of our business.

Why Renewable Energy Matters in Manufacturing?

Manufacturing is a highly energy-intensive sector, relying heavily on electricity and fuel for production, transportation, and facility operations. This dependence on non-renewable energy sources drives up operational costs and increases environmental impact.

Antonio Tarí, Chief Operating Officer, emphasizes the significance of this milestone, stating: ” This achievement reflects our commitment to reducing our environmental impact while ensuring operational efficiency and competitiveness in an increasingly eco-conscious industry”.

To make progress on reducing Scope 3 emissions, which include supply chain emissions, we are employing a number of complementary strategies.  These include actively engaging with suppliers and incorporating sustainability requirements.

Measuring Our Impact: CDP and Sustainability Reporting

Transparency and accountability are fundamental to our sustainability strategy. That’s why Dolz actively participates in the Carbon Disclosure Project (CDP), a global initiative assessing companies on their environmental impact and climate strategies. By aligning our renewable energy transition with CDP reporting, we ensure our commitments are measurable, verifiable, and aligned with international standards.

Through CDP, we track key metrics such as greenhouse gas emissions, energy efficiency improvements, and the long-term benefits of our green energy investments.

Industrias Dolz holds the ISO 14001:2015 Environmental Management System (EMS) certification at its Almazora (Spain) plant, which spans 25,000 m². This certification reflects our commitment to environmental responsibility and is seamlessly integrated with our ISO 9001 Quality Management System, reinforcing our dedication to both quality and sustainability. By adhering to these rigorous frameworks, Dolz ensures continuous improvement, regulatory compliance, and the adoption of best practices in all our processes.

By embracing continuous innovation and responsible business practices, we aim to provide premium aftermarket solutions that contribute to a more sustainable world, ensuring compliance with sustainability regulations.

La entrada Dolz Sustainability Milestone: 25% Renewable Energy se publicó primero en Industrias Dolz.

La entrada Discovering the main water pump components se publicó primero en Industrias Dolz.

In today’s article, we will learn about its main function and the importance of this key element in the timing chain system. 

What does the timing chain tensioner do?

We find two types of chain tensioner: hydraulic tensioner and mechanical chain tensioner.

The tensioner ensures the correct and necessary tension of the timing chain that surrounds the crankshaft sprocket and the camshaft sprocket. It exerts full control, making the chain run smoothly, preventing it from rattling and coming off the sprockets. In addition, it protects other elements such as alternators or water pumps against failure.

On vehicles equipped with a timing chain, we can find the tensioner in the cylinder block. When the chain is driven, the tensioner provides the necessary tension and can absorb shock and vibration of the chain, which means that it also improves its resistance to wear. Therefore, it is a vital component in the timing chain system.

What signals timing chain tensioner damage?

Is a fact that chains will stretch due to use and over time. Wear and tear cause increase of vibration and besides causes wear on other components such as the chain tensioner.

There are some signals that can warn of a tensioner malfunction and, as such and as further explained below, will advise the user of the presence of a failing timing chain system so that they can take appropriate action.

• Rattling noise from vehicle engine.
• Loss of engine power.
• Problems when starting.

As we can see, if timing is not synchronized as it should, this will cause a series of problems related to the engine, even becoming catastrophic.

Normally, any abnormality related to the chain drive can be detected by a rattling noise. Chain tensioners that have suffered a lot of wear can be heard in some cases because the chain makes this sound.

You may like: The fundamental role of the crank sprocket in the timing chain

How to prevent chain tensioner damage and avoid costly repairs

As we all know, it’s easier to stop something happening in the first place than to repair the damage after it has happened. For that, at DOLZ we always recommend acting preventively to avoid possible damage caused by any breakdown.

Preventive maintenance will save you from potential serious engine damage as well as costly repairs.

It is important to be attentive to the symptoms of wear and tear that we have discussed previously. If any of these signs happen, check with your trusted dealer as soon as possible.

When replacing a component of your vehicle’s engine, at Dolz we always recommend a practice that will optimize the system life: replace all the associated parts with that component. By doing this, the condition of the timing components is consistent so the overall performance will be optimized.

Keep reading: Top 8 reasons to choose Dolz vehicle replacements

Discover our new range of Timing Chain Kits

Dolz timing chain kits correspond to the top-selling PN numbers on the market, which are available in the electronic catalog TecDoc (TecAlliance).

These are Full-Kits with all necessary for a professional replacement: timing chain, chain tensioner, guides, cam and crack sprockets, gasket, oil seal, VVT, bolts…

Therefore, as an key component in the distribution system, all our kits include tensioners. These can be with a simple pusher, which require the tilting guide, or they can have the guide itself already incorporated into the piston plunger. For further information contact us.

Related content: Ready to take the next step? 👉 Dolz introduces 4 exciting new timing chain kits for the DV5 engine including the Full Assembled version!

La entrada Chain tensioner: key component of the timing chain system se publicó primero en Industrias Dolz.

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.

La entrada Peculiarities of an auxiliary water pump se publicó primero en Industrias Dolz.