auditunerb5

Shortly after spiking my motor way pas 30 psi due to faulty wg connection, my motor developed a tick in the back of the motor and also started burning oil big time. Mainly on plug #4. I also found a small amount of metal on #4 with a magnet.

I pulled my motor apart last night. Unfortunately I didn't do a compression test first.

What I found was no problem with pistons,walls,headgasket,head, nothing I can tell is wrong. Just lots of oil runnin down motor between head and block, oil in every cylinder.

I'm thinking the head bolts stretched and lifted the head?

pics :

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no oil in the turbo!

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JWG

the head gasket appears in good shape.

Audi uses stretch bolts meaning the steel has "spring" quality to it--according to a local automotive engineer who has two Audi V-8 chassis and three aluminum V-8 engines (not only can he always mod one engine, but when he swaps it into one of the chassis, he does not lose any driving time--now that's dedication), the bolts will stretch in and out like a spring within tolerance. However, also like a spring, stretch it too far and/or too often, and it will never return due to fatigue.

With 30 psi, you likely took those bolts way beyond tolerance. You need ARP studs to handle that kind of pressure; try www.arp-bolts.com. I would definitely do compression and leak-down checks. I would also worry about having done damage to the bottom end, but that takes a lot of hours to properly inspect.

Also, have a machine shop check the head for warpage and electronically scan for cracks invisible to the naked-eye.

Good luck!

STASIK_A4

it depends on the type of pistons and piston rings that you have used you might of worn them out with the ammount of boost you were running, and our 1.8T have oil squirters that squirt oil up the piston to cool aswell as lubricate it. It could be leaking oil through that and that could be your problem....

jrryan

and purged oil past the rings or valves. Block or head/s should to be 'o'ringed over 20 psi. Advice would be to bolt the head on - do a leak down test and check for ring damage at the very least.Tensile strenth is gone on the head bolts, replace them!!! Good luck to ya!

Justin517

coolant too, but if u fried ur rings there would be only oil.

Rob K

Should have done a leakdown test before pulling it all apart.

SMOKINA4TURBO

Re: I agree, I've ran 30 psi on stock head bolts before.

auditunerb5

Interesting turn of events once I got the head back on:

1. There was small amount of coolant with the oil. Plenty of oil had leaked from between head and block but looked like it had been doing it for awhile. Also found fault pcv valve which explains most of the oil.

2. I did a leak down using snapon leak down tester. Some air was heard thru the dipstick but it wasn't terrible. Not a lot of compression tho because none of the intake valves are sealing? #1 is the best, #4 is the worst. I even took of the cams to make sure there was no pressure downward on the valves. Can They all be bad?

3. Minor detonation on cylinder two.

auditunerb5

I was getting 20% leakage on every cylinder. This is with the cams out of the head..

I'm going to pull the head and check the valve seats.........

any ideas?

Devious27t

explan how you did the leak down... my engine did 3% across the board 6000 miles ago (68K)