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  You are here:  Home Products Engine Tensioners and Pulleys


Under the bonnet, a lot depends on the drive belt, which is rendered useless if you can’t depend on the tensioners and pulleys holding it in place. We only supply OE quality parts from suppliers including INA and Corteco.


Tensioner Sets

Hydraulic-Automatic-tensionerINA’s unique solution, of supplying all the parts required to replace the timing belt in its tensioner set and, in some cases, more parts than the main dealers offer, is proving popular. As the leading OE supplier, INA can offer an unequalled level of quality and confidence. To back that up the warranty offered by INA is unrivalled. It says the tensioners and guide pulleys are warranted for the life the vehicle manufacturer specifies for the timing belt. Even more impressive is that, as long as an OE quality belt is fitted at the same time as the INA tensioner set, in the unlikely event of a failure INA, will cover both if a manufacturing defect is identified.

RANGE – With over 210 tensioner sets in the range, and single tensioners where sets are not required, INA have the largest range of primary drive components.


  • Always follow the Vehicle Manufacturers timing and tensioning process exactly,
  • it’s important not to take short cuts!
  • Always tension the belt on a cold engine.
  • Always use a torque wrench to tighten tensioner and pulley bolts.
  • Check all the components driven by the belt for wear / damage.  



Over-running Alternator Pulleys

OAPOAP’s replace the conventional pulley on the front of many of today’s alternators. For many years the electrical requirements of today’s cars has been increasing and so has the size of the alternators. With today’s engines producing more torsional vibration and the mass of the alternators growing, the FEAD system was expected to absorb more vibration. A cost effective and innovative solution was to decouple the alternator with a one way or sprag clutch to allow it to freewheel during decelerations in engine rpm.

RANGE – INA have produced over 45 million OAP’s and with 160 part numbers in the range they are the global market leader in OAP.


  • Check the OAP every time the FEAD belt is removed by locking the alternator rotor and turning the pulley. It should “slip” in one direction only.
  • When changing from a non INA OAP to an INA OAP check the torque value hasn’t changed.
  • You will need a special tool to remove it and they are available from Camberley Auto Factors.


FEAD Systems

Auxiliary belt tensioners are notorious for being ignored; vehicle manufacturers give little or no advice about replacing them, merely suggesting “check the condition” on service schedules. It should be borne in mind that they are, in many cases, a safety critical component (belt driven PAS pumps or Vac pumps assisting brakes); will have done the same mileage as the primary drive belt tensioner; could lead to a primary drive failure if the FEAD belt wraps around the crank pulley and, probably most obvious of all in most vehicle applications, you have to remove the FEAD belt and tensioner to replace the timing belt so renewing it will incur minimum cost to the vehicle owner. With two million FEAD belt replacements per year the profit opportunity in replacing FEAD tensioners and pulleys is massive.

RANGE – INA is the largest OE supplier and with over 800 FEAD components in the range INA can offer the largest and latest FEAD components in the aftermarket.


  • Hydraulic tensioners should be primed before the belt is fitted.
  • A vibrating tensioner may be due to a faulty OAP.
  • Always use a torque wrench when tightening tensioner and pulley fixings.
  • Always check every driven component in the system for wear / damage.


Decoupled belt pulleys and bolts

decoupled-pulleyUnder the bonnet, a lot depends on the auxiliary belt drive - alternator, power steering pump, water pump and other ancillary units all need to keep moving. However, the transmission of typical crankshaft vibrations to these units can produce an increased noise level, severe wear of adjoining components and undesirable vehicle vibration.
An innovative development from Corteco allows effective decoupling of crankshaft vibrations from the entire belt drive for the first time. The Decoupled Belt Pulley is connected to the crankshaft by a highly elastic elastomer-metal joint, minimising the transmission of vibrations to other vehicle components and therefore the associated undesirable effects on the entire vehicle.
The vibrations of the crankshaft are reduced by up to 90% over wide speed ranges. This has the effect of lowering the resonant speed of the belt drive when the engine is idling.  The Decoupled Belt Pulley is therefore designed to meet the requirements of modern, high performance diesel engines, which develop a considerably higher vibration response than petrol engines.

Expensive Economy Measures
No matter whether a customer complains about a drive belt being too loud or whether ancillary units damaged by vibration lead to expensive repairs – belt drive decoupling deficiencies are always associated with dissatisfaction. Anyone not using original parts for a Decoupled Belt Pulley is making a false saving. Cheap counterfeit products generally lead to complaints after a short running time and loss of customer confidence. On the other hand, original parts from Corteco still work reliably, often after 100,000 kilometres.
It is important that only an original replacement is used, because a Decoupled Belt Pulley must be matched exactly to the engine. Corteco is an original equipment manufacturer for many vehicles, and the quality of their replacement parts is guaranteed by the correct selection of components and exhaustive testing.
The decoupled belt pulley should be checked after about 90,000 km and replaced together with the tension belt.  Rely on OEM quality, for only satisfied customers are good customers.






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