Question about Audi A4

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Hi I have a Audi A4 which the tensioner bolt broke and this made the timing belt become loose, replaced with new tensioner and set the timing up, car wont start, removed the rocker head cover and all the input valves are down does this mean that the valves are all damaged, the car is 20 valve 1.8.

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  • rabc2000 Sep 07, 2010

    Its not the intake valves its the exhaust valves that are all down the exact same amount, the valves look to be in position its the buckets that seem to be down.

  • rabc2000 Sep 07, 2010

    its the exhaust valves not the intake valves they are fine.

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  • Master
  • 1,978 Answers

If the intake valves are down you will have to remove the head and replace the valves. A compression test will confirm the issue. If the fact that the motor turns over to fast is not enough to convince you. Some motors are designed not to bend the valves when the belt slips or breaks, unfortunately , yours is not one of them.

Posted on Sep 06, 2010

  • David Belcher
    David Belcher Sep 07, 2010

    Does it turn over fast like the spark plugs are out? Have you run a compression check? I'm sorry but if all four valves (intake OR exhaust) now have excessive clearance between stem and rocker arm or cam and shim (are not coming back up) and there is no compression , you have bent valve stems and need to replace the valves.

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tdisline_471.jpg
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Including the new tensioners £250 I had mine done about 6 weeks ago but I also got a water pump at the same time. If you are doing it anyhow then do get new tensioners and replace the water pump they commonly fail on the 20v engine and most times thats the engine finished.

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This isn't too bad a job as timing belts and water pumps go, but then I've done so many timing belts and water pumps on so many different vehicles its all just a blur now!!

It is always recommended that if you release the tension from an old timing belt then you should fit a new belt and discard the old one.

I would also urge you not just to fit a timing belt. Buy a whole belt kit. You should change everything the belt touches which runs on a bearing, and apart from the water pump, it will all be included in the belt kit. The water pump is purchased seperately.

If any of the bearing-run components pack up then it will be just as devastating to the engine as a broken timing belt, because the timing will jump several teeth and valves and pistons will collide. The belt may even sheer or snap.

It is for this reason that if I ever get a call out for a routine timing belt change, I always advise the full kit, and the water pump.

It may sound a bit expensive to be replacing items that may not require changing, but if you think its only once every six years or so then its not that bad.

It is also very important to observe the torque settings for the center bolts of any pulley wheels (idlers and tensioner). If you whack them up too tight then the applied forces from the timing belt, instead of being dissipated through the bolt and into the engine, will instead act upon the bolt and it will eventually snap.

Apart from that, the very best of luck with it.

Regards

Geordie

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