Question about 2004 Audi A4

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Broken timing belt. engine turns over and put a wrench on cam shafts and they turn over pretty good

I have a 2002 audi a4 1.8T and it broke the timing belt, I removed spark plugs and turned engine to where no pistons were on top and turned the camshafts with a wrench it seemed to turn good and I did not hit any spots where it would lock up. cranked the engine, it cranked smooth and even, tried to look down the spark plug holes and did not see any spot where the valves might have played tag. what's my chances on not removing the head????

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Have someone perform a leak down test on each cylinder. This will tell you if you possibly bent a valve on any of the cylinders. If you did you need to remove the cyl. head to have it looked at. If the leak down test is good on all cylinders you should be good with just replacing the timing belt and tensioner. The likely hood that you didn't bend a valve is slim since that motor is an interference motor.

Posted on Apr 23, 2009

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I will give you 1500$ for it, you will need a new engine. these are interference motors- you bent valves and damaged pistons

Posted on May 19, 2009

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These are interference engines. If the timing belt was never replaced and the car has over 120000 miles on it, I bet the belt broke and then the pistons hit the valves and you have trouble.

Without spark plugs in, you should be able to use a large wrench to turn the engine. If there's any resistance, you probably have a piston touching a valve.

What I would do is to remove the valve cover and possibly the cams, then with all the valves closed, see if I can turn the crank over.
You might be able to get a small inspection camera down the spark plug holes to look in the cylinders, and maybe even with all the valves closed do a leak-down test to see if the valves are sealing.

If you can get all the valves to seal, they're not bent or broken AND the pistons are sealing well (meaning, no holes in them). Then you could adjust the timing and put a new belt on it and see if it runs.

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A used engine might be a good idea, but I'd verify there's a problem first. You CAN get lucky and the belt broke when the engine was started and nothing got damaged.

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Here are the full instructions and tools needed.

Required tools:

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1 Answer

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