Dayco has recently introduced the auxiliary belt tensioner and water pump friction wheel drive into the aftermarket for independent garages working on the PRINCE BMW PSA 1.4 and 1.6L petrol engines commonly seen in a wide range of BMWs, MINIs, Peugeots and Citroens.
With concerns that many technicians may still be unaware of the system, Dayco’s Glen Goldstone has shared some of the common system failings that come with age.
Dayco produced both the single-arm torsion bar tensioner, which replaces the traditional spiral spring tensioner on the auxiliary drive system, and the motorised ‘switchable’ friction pulley that actuates the water pump.
When running below normal operating temperatures, the water pump is disengaged and only operates when the friction wheel is activated under warm engine conditions.
The friction wheel is in constant contact with the crankshaft pulley, but with the use of an electric motor the pulley’s radial movement is altered, and the rotating friction wheel comes into contact with the surface of the water pump pulley, bringing it into operation.
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