the_merv

iTrader: (88)

I've been looking into a major Oil consumption problem that I have and from what me and some people have narrowed it down to it may be the Rocker Bolts leaking Oil into the Cylinder. I didn't know that they had to be sealed, so there is tomorrow's project.

Here is the details on my problem and what I looked at to come to that conclusion..

-All 8 Cylinders are wet with Oil as soon as I shut the car off, I pull the Plugs out and Oil is on the threads and on the Plug. That rules out the Rings since it's wet, if it was the Rings the Chamber would be dry.
-Last set of Rings that came out of the Engine were flawless(I had re-built this ~6k miles ago due to a Spun Bearing when the Oil Pump failed), so this kinda makes me lean away from the Rings aswell.
-Engine has great Compression and runs very nicely and stable.
-Was thinking Valve Seals, but it burns waaaay to much Oil to be them.
-IMO no way possible all 8 Pistons could have bad Rings or all 16 Valve Seals could be bad after ~6k Miles..not all of them at once.
-Burns most of the Oil on the acceleration and the deceleration.


This what I have come to figure out because all 8 Cylinders are doing it, and every other thing checks out. There is no PCV System on the car, I took it off so I could narrow this down.

Anyone have any input?

Sorry if I ramble on with this..I'm just trying to get this piece to stop burning Oil..

Heads are stock L92's BTW..

LS1MCSS

iTrader: (18)

If the rocker bolts aren't sealed, that could very well be the problem. I don't know what everyone else uses, but I put red loctite on mine.
I have the engine sitting in the car finally, but have a lot of wiring changes to do before it fires.

the_merv

iTrader: (88)

I talked to a friend of mine and he said that he uses Teflon Paste, so I'm going to go and find some of that today and tinker with it.

69LT1Bird

iTrader: (1)

How do you think the rocker bolts are allowing oil into the cylinders? Unless the ports were ported and ported too much the holes that the rocker bolts go into will not be exposed.

What kind of breather system do you have?

the_merv

iTrader: (88)

I have L92 Heads..they have some large Ports. That and from what I have researched I should have sealed them. I'm about to do that now, so hopefully it helps.

69LT1Bird

iTrader: (1)

I have the same heads, that's why I am quizzing you on how you think the oil can get past the threads and into the ports in enough quantity to cause your problem. There is no direct hole into the ports.

Scoggin Dickey

iTrader: (34)

There's no direct hole to the ports on those heads in stock form. Only some CNC ported heads have the intake rocker bolt holes exposed to the runner.

the_merv

iTrader: (88)

Yea I found that out when I took it apart earlier..I'm still burning Oil. Next step is pulling the Intake and checking the Runners and the top of the Valves. If they are wet then it's the Valve Seals.

It's just wierd that it's all 8 Cylinders wet..

I'm still leaning toward something in the Heads.. I figure if it was Rings that the Chamber would be dry, but that's my knowledge so correct me if I'm wrong.

69LT1Bird

iTrader: (1)

Since you don't have a pcv system, what are you using for breathers?

AJ52486

I had to use teflon thread sealant on my rocker studs when I installed my AI 200cc heads.

I could see blue smoke coming out the exhaust when the car was idling, but there was no smoke when I was driving. When I would stop for more than a few seconds, the smoke would come back. This was caused by the vacuum at idle pulling the oil through the threads on the studs.

After I sealed the rocker studs, I haven't been burning any oil.

the_merv

iTrader: (88)

^^With your Heads them Threads more than likely protuded into the Runner, with mine they don't. Later today I'm pulling the Intake and checking the Ports and the top of the Valves. If they are covered in Oil then I know it's the Valve Seals or Guides.
I'll update when I find anything out so hopefully we all can use that info to figure out what's up with it..

I have a 90* Elbow on the drivers side Valve Cover where the PCV Valve would have been. On the passengers side I just have the oil cap, I have been looking into making a Breather for that side aswell.

the_merv

iTrader: (88)

Well I got the Intake off, on every Valve that is closed there is a nice little pool of Oil.

Looks like it's Valve Seals. I don't understand how all 16 could be bad..maybe I installed them wrong or it's a bad batch or something.
Atleast that's easier than Rings.

Scoggin Dickey

iTrader: (34)

What springs and valve stem seals are you using?

IH8FORD

iTrader: (6)

I'm having the same problem. I replaced my valve seals and same thing happened again. Did you get yours sorted out

1lejohn

iTrader: (9)

Thats what I use.

1lejohn

iTrader: (9)

There are different seals for the intakes and exhausts. You used the correct ones of course.

IH8FORD

iTrader: (6)

Yes black ones on the intake brown ones on the exhaust. The machine shop had installed the seals from comp I believe and they did the same thing.

1lejohn

iTrader: (9)

Stock GM ones here with no problems. I think you answered your question in the other thread. Good luck.

BigDB

Same issue here too, my studs do protrude into the port (TFS heads) but they are seald. I beleive its the PCV system for me as my manifold was covered too.