Valve Timing (TDI AEL/AAT)

ALC_A6 · 01-22-2006, 10:24 PM

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.

EDIGREG · 01-22-2006, 10:32 PM

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.

4Driver4 · 01-23-2006, 03:25 AM

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.

A couple of posts (follow the links) about cam timing on my C5

Edd W · 01-23-2006, 04:45 AM

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.

4Driver4 · 01-23-2006, 05:58 AM

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.

ALC_A6 · 01-23-2006, 10:27 PM

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.

01-22-2006, 10:32 PM	#2
EDIGREG AudiWorld Super User Garage is empty, add now Join Date: Oct 2005 Posts: 4,333	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. __________________ Ed

01-23-2006, 03:25 AM	#3
4Driver4 Tech Guru Garage is empty, add now Join Date: Oct 2002 Posts: 32,308	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. A couple of posts (follow the links) about cam timing on my C5 __________________ 4Driver4 "Never give up the throttle until the bitter end." -RC 2005 A6 Sedan Q 3.2 (wife's whip) 2000 A4 Avant Q 2.8 (daily driver) 2003 Mini Cooper S (Fun!) 1995 Mazda Miata: the anti-Audi 1999 Mazda Miata SSB: track beotch 2003 GMC Yukon Denali XL: the anti-earth 2004 Dodge Dakota: hey, at least it's stick and 4x4

01-23-2006, 04:45 AM	#4
Edd W AudiWorld Super User Garage is empty, add now Join Date: Aug 2002 Posts: 4,212	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. __________________ A8 4.2Tdi, 06, Grey/Grey - my new toy - how can a diesel be this fast? 2010 A4 2.0tdi 6 spd SE Executive avant - dark blue & Vanilla - Wife's new one. VW Touareg 06 30k 6spd 2.5Tdi - Wifey's new one, A4 was not big enough! A6 2.7t 01my 6spd Avant 51k miles - Sold Dec 2011 - Gone to Banbury A4 2.0FSi SE 03.8 22k miles - Wifey's new one - the golf was not luxurious enough. Sold 30/08/08 - gone to Heathrow. Golf Tdi 03.08 130pd, 6spd, 19k miles - Sold 8th November 2006 - gone to Coventry! A6 2.8q 98.11 115K miles - sold 20th Feb 2006 - gone to Kidderminster. 100 2.8q 92.1 147k miles - Sold 6th July 2004 - its new home is Edinburgh A4 1.6 97.8 99k miles - Sold 12th Feb 03 VW Golf Gti 86 22k miles 2.0 Oettinger 190bhp, lowered, lightened and quick and sold 23/03/08. Gone to Coventry.

01-23-2006, 05:58 AM	#5
4Driver4 Tech Guru Garage is empty, add now Join Date: Oct 2002 Posts: 32,308	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. __________________ 4Driver4 "Never give up the throttle until the bitter end." -RC 2005 A6 Sedan Q 3.2 (wife's whip) 2000 A4 Avant Q 2.8 (daily driver) 2003 Mini Cooper S (Fun!) 1995 Mazda Miata: the anti-Audi 1999 Mazda Miata SSB: track beotch 2003 GMC Yukon Denali XL: the anti-earth 2004 Dodge Dakota: hey, at least it's stick and 4x4

01-23-2006, 10:27 PM	#6
ALC_A6 New Member Garage is empty, add now Join Date: Sep 2005 Posts: 6	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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01-23-2006, 10:27 PM
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