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Belt too tight

Question : SINCE replacing the timing belt on my Citroen ZX a month ago, there has been a whirring noise from the engine on gentle acceleration. The noise is not present when running at high speed or when the vehicle is at a standstill or idling.

Kindly advise if the noise will eventually have an adverse effect on the engine and if it can be eliminated easily.

Answer : IF the noise was not present before the timing belt change, it is most likely that the belt was over-tensioned after renewal, resulting in overloading of the water pump bearings and the resulting whirring noise.

This is common, especially on engines where the timing belt idler (bearing) has to be manually tightened against the belt.

A special tool is used to measure belt tension.

Guesswork is not an option since over-tensioning results in shortened belt life as well as the life of the components that the belt drives, such as the water pump.

 
   
 

Timing chain or timing belt

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Self service

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Safer to change other bits, too

Doubting the manufacturer

Belt too tight

Timing chain

Belt or chain?

Timing Belt

Timing chain

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