Timing chain problems - Page 2

ulfilias · #11 11th March 2010, 07:38 PM

Hithere,

300,000 miles. Wow....Ok. That gives me a lot more hope. I'd heard something about 100k and was contemplating the smarts of doing both at the same time as the can is 156k. Irritatingly the cam belt etc was done by audi less than 25k ago just before i bought the car and it would have made sense to have done it then. Nasty think is i have a feeling it was just showing back then as they ivestigated noises at the front end. Replaced oil filter housing etc.

However there was a check engine light which i was told was due to the LPG, however the VGACOM code did mention timing....not that you know this when buying a car etc.

Hmmm....I am wondering if my mechanic guy is really suited for this. I don't want to go to the dealer if pos.

BTW those figures about inc or ex vat ???

Oli18 · #12 11th March 2010, 07:40 PM

Can't tell for sure but i think that's what happened to me too?!...

See here

Mine was a write off in the end but i got a better car in return

Good luck with it mate...

Oli

ulfilias · #13 12th March 2010, 09:24 AM

Hi There Oli,

Looking at yours the Chain snapped. I don't know quite why you'd need a new head though, unless something nasty happened. Maybe bending the cam shaft, but even then swap the shaft not the head. Although maybe its quicker to swap the head....but given you couldn't find a matching one easily ???

cya,
Lee

#14 14th March 2010, 07:25 AM

Quote:

Originally Posted by ulfilias

Hi There,

Right been on to Audi Huntingdon and the code is now 077109087P As it has been superceeded from the E. Audi is quoting £308.15+v = £362.08 - I checked with Audi Peterborough and its the same price.

A net search is giving an american site with pictures if anyone is interested !
http://www.ecstuning.com/Audi-D2_A8-...ical/ES261322/

Hi there same thing as happened to me, I've got a 2.8 v6, you can get the part at A8 parts for £97-00 plus all your gaskets, Audi quoted me £460-00 for the tensioner on its own.

ulfilias · #15 16th March 2010, 09:31 AM

OK.....Am looking at this job. The timing belt needs removing....However it was replaced 25,000 miles ago, so i see little point in replacing it. The old idea was 100k, however the audi invoice thinks 75k. Either way its 2-3 years of motoring at my current level and you only gain a year by doing it now and add a considerable cost in parts.

The big thing that is throwing me at the moment is the special tools. My mechanic is happy to do the job, but doesn't have them as he is not an Audi specialist. Is obtaining them a killer ???

Ta,
Lee

ulfilias · #16 18th March 2010, 11:45 AM

Just got a variator from A8 Parts and the nylon guide is clipped on. Literaly a press fit. I was curious how they could make them bonded and what adhesive would last in an engine enviroment due to the heat ect - I work with adhesives !
They have a code on them 10.100472 - I've taken a few snap shots and will upload them later. They are quite this and i would guess would fit under the slack of the chain when the variator is down - In compression test minus plugs and packs we noticed the chain and variator raised and lowered.

I've not got the car with me, so i've yet to check, but it is certainly interesting. What i am worried about is that as the guide broke the chain may have grooved the metal and thus i may not be able to press fit it anymore ?

ulfilias · #17 30th March 2010, 10:18 AM

Hi There,

In doing some research, the pads are available as an aftermarket part. They are sourceable via Ebay as "AUDI VW 1.8 20V TIMING CHAIN TENSIONER PADS" - It seems after checking a load of US sources they are the exact same pads as the ones in the 40v AVP engine i have and after ordering a set they are identical down to the code on them (10.100472). After a bit of thought and seeing the wear on the other side of the engine, I have ordered a second pair for the other side. For the sake of £100ish extra (£33+£5 gasket+labour) it makes sense to do it.

Looking at the new pads, they don't have any grooves on the top and the left hand side you can see a good couple of mil of wear, so i think it makes sense.

http://cgi.ebay.co.uk/AUDI-VW-1-8-20...item439bac24fc

ulfilias · #18 30th March 2010, 09:50 PM

And so the plot thicken....

I got to the garage this evening and they both sides changed with new shoes on and the timing belt on. The engine cranked and they were checking for oil flow. However Huston We have a problem.....The 'new' (RH, front) tensioner was not rising. In swapping the shoes on the other (LH, Back) the top part seemed free and raised, however that was the state it was in on the engine.

Both the 'new' one and the old (chain bitten) one, the top part seemed jammed....but not quite, it would rotate slightly (1-2 degrees) and lift slightly (2-3mm). Yet wiggling (on the chain bitten old one) and even some considerable pressure would not free it.

We checked the cam sensors, the solinoid action and a few other things besides before noticing on cranking that there was oil leaking from the top of the tensioner arround the shaft.

In trying to 'free' the old one to see what had happened i snapped a chain locating lug on the tensioner and me and a couple of mechanics decided to open the thing up to see what had gone wrong. We pretty much destroyed it in the persuit of investigation and found that there is a ball bearing lock which when the top part is down locks it in position if there is not enough oil pressure in the unit, a kind of fail safe i guess. There was a perished O ring which was the cause of lack of presure, thus the lock out wouldn't release and the top tensioner was mainly inactive. The bottom part still keeps the chain taught but the variable timing i guess is inactive. I also think this is what caused the shoes to break up along with natural wear and tear.

Curious that the 'new' second hand one is also plagued with the problem. This one is still on the engine and without destroying it, its is imposible to say for certain, however the oil presure not builing up and floating the top shoe plate because it is comming out the shaft would indicate a similar perishing.

I am curious how many people have this problem without noticing. You'd need to take the rocker covers off and remove the spark plugs then turn the engine over and watch. I bet there are a lot of worn shoes and O ring leaks in older, higher mileage engines though !

To fix mine now i'll be rapidly searching for a new tensioner for the RH side tomorrow. I wonder where Audi keep spares in the UK ?

Goran · #19 4th March 2011, 09:46 PM

I hope you fixed your problem, I was very scared reading your post to find out there are these plastic things inside the engine with chains running over them.

I was curious and after a lot of searching I found a nice picture on audiworld which shows this system.

http://forums.audiworld.com/showthread.php?t=2799035

ulfilias · #20 10th March 2011, 09:02 AM

Hi There,

Well it was all sorted. The right hand passenger bank was replaced and since i had spare shoes we replaced those on the left hand side and all was well.

*HOWEVER*

I have recently had another nasty noise, the mechanic initialy thought it was the gear box/flexiplate/torsion converter as it was from the back of the engine and note didn't change much, but No it is the drivers side tensioner

It seems free and is moving up and down. I haven't seen it, but am curious what would be causing this ???

Any ideas or is it swapping a new tensioner on the lefthand bank ???

077109087P - Cylinders 1-4 ? - BTW just my luck there is a new and cheaper 5-8 audi part on ebay atm. *waaa*