Vehicle & Technical > Defender

300tdi squeak on idle - IDEAS?

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v8seriesone:
i've put a bit of lube on all the pulleys, played with the tensionner, had a good listen and i'm now thinking its the water pump. main reason is when i slacken the tensionner with the engine running the squeal doesn't change and it should i think.

Dom.

muck_truck:
i thought exactly the same as you. when engine is running put a ring spanner on the bolt that goes through the center of the tensoner wheel so its anywhere between 9 - 11 o'clock (not the bolt that holds it to the engine.) Then gently pull the spanner towards you so you are twisting the tensioner and see if the noise goes away. you may have to play about a little pulling a birt harder, pushing on it etc.

Give that a go. i had spent ages trying to fix this same problem and the washer fixed it in mins.

the noise comes from the groves on the belt climbing up the groves on the water pump pulley and then slipping back in cause the tensioner doesnt run true to the water pump pulley anymore. You may find the bolt that holds the tensioner to the engine is slightly bent as well.

Its cheap and quick to try before buying a water pump and new coolant.

v8seriesone:
Thanks Dan I'll try that!

Dom.

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