Oil Burning

[bigvette1]

Finished rebuilding the BB and after breakin and maybe 200-300 miles it is using oil. If fact, you can see a haze from both exhausts so it is considerable.

Here are some symptoms or info.
1. There is no oil inside the PCV hose so I am not sucking it out of the valve cover.
2. With the PCV plugged you draw a vacuum from the other valve cover - that seems right.
3. With both the PCV out and the other valve cover opened, cover both valve covers and you have a postive pressure - think that is ok also.
4. Compression is equal on all cylinders.
5. All spark plugs are equally black and have a oil coat.

So this seems to be 3 areas: Intake manifold, valve guides or seals or rings.

Queston - is there a fairly reliable way to determine what the cause of the problem is??

 

[bigvette1]

Many thanks. That is a comprehensive writeup on all aspects. Thanks. JP

 

[69autoXr]

Only 300 miles, the engine is not even broken in yet. Is the oil consumption excessive? I'd say your rings have not fully seated yet, and I would expect some oil use in with that few miles on the motor. Also, are you driving it hard? You should go easy on it for at least the first 500 miles, then change the oil and hopefully you should see improvement in the oil consumption.

 

[bigvette1]

Nope I am not driving it hard at all. Tops has been 4000 rpms. The oil burning a visable smoke at idle, take off or if you rev the engine it really smokes. I have been hoping the rings will seat but it seems to be getting worse. I really think either the oil rings have failed or the valve seals at junk. Thanks for the advice.

 

[Jack]

Finished rebuilding the BB and after breakin and maybe 200-300 miles it is using oil. If fact, you can see a haze from both exhausts so it is considerable.

Here are some symptoms or info.
1. There is no oil inside the PCV hose so I am not sucking it out of the valve cover.
2. With the PCV plugged you draw a vacuum from the other valve cover - that seems right.
3. With both the PCV out and the other valve cover opened, cover both valve covers and you have a postive pressure - think that is ok also.
4. Compression is equal on all cylinders.
5. All spark plugs are equally black and have a oil coat.

So this seems to be 3 areas: Intake manifold, valve guides or seals or rings.

Queston - is there a fairly reliable way to determine what the cause of the problem is??

Something to consider ... It can be real easy to install rings upside down ... on one piston ... or all eight. I once carefully laid out all eight sets in the "proper" order ... then two pistons into ringing ... I realized I'd laid out each set with a ring upside down. Upside down top or second rings will pump oil & never seat.
JACK:gap

 

[bigvette1]

Jack, that is the horror or my dreams. Ring upside down. I am going to pull the intake and put in new gaskets just to make sure before I have to get into the big stuff. Thanks.

 

[kbelcher]

Re: Re: Oil Burning

Something to consider ... It can be real easy to install rings upside down ... on one piston ... or all eight. I once carefully laid out all eight sets in the "proper" order ... then two pistons into ringing ... I realized I'd laid out each set with a ring upside down. Upside down top or second rings will pump oil & never seat.
JACK:gap

I'd agree with Jack. Sounds like the rings were installed incorrectly...