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Valve Timing (TDI AEL/AAT)

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Old 01-22-2006, 11:24 PM   #1
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Default Valve Timing (TDI AEL/AAT)

Hi All!

I have changed the timing belt. But my car left the power. The fuel compusion higher.
I didn't use the special tool, which fixing the camshaft. I just setting up by eye.
Question1:
If there are 2-3 degrees differences in the timing, should this cause the problem?

I have changed the copper washer under the injector. But 4 in 5 are leaking.
Question2:
Cause this problem the power loss?

The leaks are not too big. Just a bit. The diesel oli are flow out to the motor block... About 10ccm per/40 km.
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Old 01-22-2006, 11:32 PM   #2
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Default Yes that will cause bad problems....The timing needs to be EXACT...

that is why it is reccommended you use the cam locking tool. Its very dangerous to even crank the engine over when the timing is wrong.

However, I'm suprised the engine will even run if the timing is off. Maybe you got lucky and something else is the source of your problems.
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Old 01-23-2006, 04:25 AM   #3
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Default Read this.

Always, always, always use the cam tools. I know lots of people here don't. Yes, you don't need the tools to get the belt back on the same way the old one was...but it is right? All you can be sure of is that it's as good as the old one, plus or minus any differences in the two belts. Our cars were designed with infinitley adjustable timing. Setting the timing correctly is the best power/fuel economy mod you can do.

Check the link, which contains a few other links about the timing belt replacment on my C5. The C5 is a little different, but the timing belt procedure and cam timing importance are the same.<ul><li><a href="http://forums.audiworld.com/a6/msgs/580921.phtml">A couple of posts (follow the links) about cam timing on my C5</a></li></ul>
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Old 01-23-2006, 05:45 AM   #4
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Default This is 2.5 5 cylinder diesel. The cam timing is just as important as on....

any petrol engine but the fuel distributor is also cam-belt driven so it has to be correct.

I do not know the exact procedure for adjusting the injection timing but I do know it is critical for performance, economy and emissions.

With regard to the leaking injectors, try losening them off then gently re-tighten them but try to move the copper washer as you tighten. This all allow the washer to seat properly.
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Old 01-23-2006, 06:58 AM   #5
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Default I missed the diesel part (whoops).

But the cam timing is also infitely adjustable on the diesels too. And I agree with Edd that the pump timing should be set when the belt is changed too.
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Old 01-23-2006, 11:27 PM   #6
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Default Re: Valve Timing (TDI AEL/AAT)

I checked the timing again. But it's very very exact. I turned the flywheel to the correct position and used the special tool for checking the timing. It's well.
BUT
I tried my friend's MAF sensor, and my car regained the power. Not all, nearly 70%.
How can i clean the MAF sensor? Everybody say no way to do this. I've to buy an other one. Isn't it?
I've VAG-COM and I adjusting the injection timing by computer to the right position.
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100, 1996, 2002, 25, aat, ael, aelaat, audi, belt, diagram, economy, injection, power, tdi, timing, valve

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