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Paul! With engine running, try to disconnect the high pressure lines from each injector at the time and check iff there is a change in the noise...and disconect the small vacuum tube from the EGR valve also. i hope is not a valve issue.
All the best Eugen
AKA "THE THREAD KILLER"
99 A6 V8 saloon
85 UR Quattro
01 Sharan v6 4motion
91 Golf gti cabrio sportline
95 Audi 80 DS2 saloon. project "SWEEP"
95 Audi 80 quattro v6.(but i have a 3b engine sat on the floor)protect "SUE"
I tried loosening injectors to detect which cyl was off but it wasn't helpful. Then I had the idea to disconnect the air pipe that feeds both cyl banks by separate inlets. I unplugged the fuel pump and cranked it. Back pressure on left bank - passenger side.
Little while later I have the cam cover off and could see one inlet cam follower missing! I teased it and the valve tapper out with a magnastick. Then I found another one loose at opposite end of the bank. No tapper found on that one yet. The inlet cam is well worn and the cam followers all look like little bananas with a bite taken out. **** this is gonna be expensive. :-(
Just been speaking with a local diesel doctor. I was perplexed as to why one or more valves is stuk open. He has a very plausible theory that says the valves were staying open too long because of cam wear and then one or more came into contact with a piston causing it to be bent then not seating properly. I sort o get that except I would expect less lift with worn cams and followers - not longer duration.
Hope to have the head off tomorrow for a proper look. Damn cars.
The worn cams..at that engine can let the connection piece between the tapet and the valve to leave the location an stuck into a propper position to keep open the valve.
Then.. the piston will slam into the valve.
Sorry to hear this!
yikes Paul....i heard that the early pd diesels caused significant wear to the cam lobes due to the insane pressures they run and also there was some suspect material issues causing premature wear to the cams...though Audi never officially recalled for it, quite a few went under the radar for changes.
Not sure if it was the same for the v6 but i know when Tom rebuilt mine his Dad said the cam had a fair bit of wear on it.....hope mines not going the same way
Oh sh*t. Feel your pain Paul.
What is it with Audi's damn V6 cams made of chocolate????:
I've just gone through this with my RS4.
General consensus is that I had roughly 10-20 miles before the collets got knocked off the valve and it dropped into the cylinder. And I had zero noise up until about 300 miles before they were pulled out. Car drove spot on.
Some pretty chocolate flavoured pics for you.
Hope you get it sorted.
Offside cam, rear of the head.
Nearside cam, rear of the head (you can see the lifter on it's way out.)
Hole worn right through offside lifter.
2001 Avus Silver B5 RS4.
2004 A4 Avant 1.8T quattro Sport-LE.
1995 S2 Coupe - sold (sniff)
foook Jas, thats some amazing pictures. there has to be a QA issue that Audi never publically acknowledged. Interestingly I was just about to post this link about exactly the same thing but for the pumpe dusse engines:
foook Jas, thats some amazing pictures. there has to be a QA issue that Audi never publically acknowledged. Interestingly I was just about to post this link about exactly the same thing but for the pumpe dusse engines:
Jeez, pictures of some lifters exactly the same.
You're right David, I suspect they knew but just ignored it. It's as common a problem on the RS4 and slightly less on the S4, as it is on the 2.5TDI V6.
Many many theories abound as to why, but I'm of the opinion it's down to sh*t quality by the cams manufacturer (INA "I think")
2001 Avus Silver B5 RS4.
2004 A4 Avant 1.8T quattro Sport-LE.
1995 S2 Coupe - sold (sniff)
Cheers for the thoughts folks. Too late to post more pics now but yeah the cam and follower wear is shocking. Odd thing is it has never missed a beat before or rattled recently. Basically it looks like the thing got so badly worn that a follower just falls off. Found lots of web threads with people having different theories on whethe the issue is down to design, material or oil.
Found a place that does a whole kit for both heads for 550 plus shipping. No point in just changing one cam and a a few followers. I hope there is only a couple bent valves and that the head isn't scrap.
There is so damn much disassemble to get the head off on the V6 TDi that it's not funny. Great source of revenue for audi dealers but I bet the mechanics hate that engine.
Fair play to Mrs. S2Central's observation in the 1st place, total catastrophe averted by the looks of it. Did they ever sell that engine in the US, that's the only place you really see Audi hit the recall button. Best of luck with getting it back working.
What do you get out of a 2.5 TDI on a homefry actually?
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project "SWEEP"
Hopefully new parts will have had these manufacturing issues corrected
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