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EA82 - Timing Belt Tension


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I have a whine coming from my oil pump now only since the t-belts were replaced I suspect it's bearing related. The Haynes manual tensioning method required 18 ft-lbs applied to the camshaft sprocket bolts in a c-clockwise direction... doesn't this just unthread the bolts??!?

Belt tensioning is not really addressed in the USMB repair manual (timing belt check and replacement).

 

I think I have them too tight now, but how do you get the right tension?

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tensioning the timing belts is actually unnecessary. i've never even seen folks ask about it ever, until twice in the past month- odd.

 

i would expect something else is causing the problem. the oil pump doesn't have bearings in it, the shaft just rotates inside the housing/seal. there's no bearing there.

 

are you positive the whine is due to the oil pump?

 

if it is indeed from the oil pump i would guess the outer thin metal ring around the oil pump got bent while you were working on it. it's a very thin lip that extends just a 1/4-1/8" past the sprocket teeth, hardly noticeable unless you look at the pump.

 

that ring can separate and rub against the belt or something else. i would check that first. and also check the timing pulleys, if you didn't repalce those there's a good chance one of those is noisy.

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Indeed. No bearings... The whine is the oil pump though, I did the belts the Haynes way and I think they are too tight, felt odd snugging them up... Checked the service records that came with the car, the pulleys were done only 2 years ago. Off to relieve the belts. Thanks.

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