The power transmission system of vehicles is made up of different components responsible for transmitting the energy that comes from the engine to the wheels so that they produce the movement of the vehicle. For this, tensioners, belts, and pulleys are essential for the engine timing.

As we have pointed out on previous occasions, internal combustion engines are sensitive to outside temperature, their performance varying according to the degree of temperature. For this reason, it is important that engine in the most suitable temperature range.

In today’s article we talk about the drive belt tensioner (also known as friction wheel), designed to ensure accurate the engine’s condition and performance.



Drive belt tensioner, main features


This complex component has a torsion bar tensioner as an elastic element, replacing the classic spiral spring. It is an adjustable tensioner, and its main function is to optimize the thermal management of the engine.

As it does? Once the engine has reached a certain temperature and its thermal state needs to be checked, this tensioner activates and drives the water pump.

The drive belt tensioner powers the crankshaft pulley to the water pump pulley, which is engaged and disengaged by an electric actuator.

All this innovative system results in less mechanical loss during the disconnection phase of the water pump.

Dolz continues expanding its line of products for vehicle transmissions with SKD173T and SKD174T for PSA Peugeot, Citroën and BMW Mini (Prince Engine), available for dealers and workshops.



foto tensor de correa ajustable

Prince Engine

Awarded as the best engine in its category in the “International Engine of the Year” since 2007.

Prince engine is a compact engine family of 1.4 to 1.6 L in displacement that includes the most modern features, such as direct fuel injection, turbocharging or variable valve shock.





Advantages of drive belt tensioner


Among the main benefits of this unique system, we find:

  • Reach engine temperature faster and more efficiently.
  • At start-up, the water pump is switched off, for a better engine performance.
  • Reduce fuel consumption.
  • Reduce CO2 emissions.



Maintenance recommendations


In short, cars are intricate machines that need regular care to function properly. The transmission of the vehicle is of paramount importance for the correct performance of any engine. For this reason, it is advisable to carry out an effective maintenance that helps the proper performance of its elements and extends its useful life.

Common causes of driveline problems include improper installation of belts and pulleys, environmental factors, or faulty transmission components, but by far the biggest cause is improper maintenance. 

To do this, Dolz recommends:

  • Follow a preventive maintenance program.
  • Ensure the correct installation of the components.
  • Before placing the tensioner, clean the mounting surface.
  • Perform in the same operation the replacement of all the elements related to the transmission, including the water pump.



Related content:  3 reasons to replace both the timing belt and the water pump at the same time 



Why choose Dolz?


About us

Dolz offers a wide range of cooling and power transmission products for passenger cars and heavy-duty vehicles.

With innovative technologies, Industry 4.0, and in-house production, Dolz is a reliable supplier and manufacturer that has locations in more than 70 countries around the world and three factories in Spain (Castellón), Argentina (Buenos Aires) and China (Shouzou). 


Product Range

Water pumps – Timing Belt Kits – Timing Chain Kits – Thermostats

Selecting the best supplier is a must. Do not hesitate to contact us if you have any questions or require more information about our products.


Since 1934 …yes we have!