Audi 1.8T Timing Belt Problem.

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Last month a work friend was driving home in the above car and getting a loud banging from the engine..
He was only driving a short distance to get home (less than a mile)

We have looked into the problem and it seems the cam belt tensioner has gone so the timing may have skipped a tooth or two..

The ECU is coming up cam error..

What sort of damage could have been done? the belt is still on and has SOME tension but i wouldnt of thought enough to stop from skiping.

Any idea would be great..

Cheers

 

[-=Maxed=-]

what would the compression test tell us? that a valve has been bent?

We have turned the engine over by hand and it dosnt seem to have much trouble but we will check again!

The belt hasnt snaped but has become a lot losser... there is no tension being aplyed to the belt.

 

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Its lose enought to move a good half an inch freely...

So the only way to see if it needs more work is to compression test and if there is none then a valve is bent and need more work.

 

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You can turn the belt much more than 90 degrees...

The tensioner is a strange little thing.. its uses a spring and a metal rod to pull down on a cam witch pushes the belt in and gives tension..

I will try and get a compression test done and ill go from there.

Cheers

One thing i should have mentioned earlier is that you could check the timing marks on the cams and crank to see if they are out, that will give you some idea of how much it is out.

How much would be too much?

 

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Yes i think thats what its going to be... we have a endoscope (if thats how you spell it) at work so were going to try that in and see if there is anything that we can see.

There is a scratch on the piston 4 that ive noticed as well...