maggiesadie8525

Would a leak in the intake manifold gasket cause the motor to burn oil when excelling? It just started burning oil the same time I noticed the leak. Any input is wecome. Thank you

Bluestripe67

Yes it can. What are you seeing as the leak? The oil can get sucked into the intake port and burned. Have you looked at the plugs. You could also have lost a valve seal on one or more cylinders. Is your PCV system working well? Dennis

DUB

There is no way you can see a leak at the intake gasket that would suck in oil...because it would be under the intake where you can not see it.

Oil leaking out of an intake bolt(s) do not constitute and oil leak that would necessarily get into the intake runner.

PCV function is critical...so an answer is needed.

DUB

TCracingCA

It sounds like buildup of internal engine pressures to me if related and if not, then independant problems! Also how is your oil pressure gauge reading?

Frankie the Fink

DUB is on to something; oil pullover (not necessarily a leak) could be the culprit...you should have a baffle under the intake; the 'tomato can' in the lifter valley to separate oil and vapors and a properly functioning PCV system (or road draft tube).

Hard to say if you DON'T TELL US WHAT CAR AND WHAT ENGINE ?

maggiesadie8525

Sorry about that it's a 327/350hp just rebuilt. I have a good idea why the intake gasket is leaking but not sure if the leak is causing the burn on exceleration once it puffs out smoke it seems to be alright go figure.
Thank you

Frankie the Fink

You're positive the smoke is on acceleration and not when you let off the gas which is when manifold vacuum spikes up ??

maggiesadie8525

when i floor it it comes out. What do you think?

DUB

Blueish white smoke??? black smoke??? white smoke?

How many miles on engine and has it been rebuilt to you knowing.

Exactly when it is blowing smoke.
1.) ONLY when I crank it the first time of that day.
2.) Only once...when I get on it when it is warm/hot.
3.) It does it all the time when I get on it..and it is like a smoke screen behind the car.

DUB

maggiesadie8525

Looks like blueish, around 2,000 mi I had it rebuilt from a guy in Wisconsin

66jack

Did they surface the intake?

maggiesadie8525

no jack

Frankie the Fink

Could possibly an intake leak or bad piston oil rings. Prob not valve seals...they normally smoke on start up which the OP hasn't said is happening...

maggiesadie8525

HI Frankie the Fink, could a leak from the intake manifold cause the car to burn oil?

VetteRed1965

Had an internal intake leak on the no 4 and 6. Replaced the intake valve seals.Did not clean things up.
Pulled the intake,you could see on the bottom of the mating surfaces on the no 4 and 6 head runners where oil was being sucked in from the lifter valley.Cleaned the mating surfaces and put on a new gasket no problems. Smoking gone

Frankie the Fink

The post above covers it - however as mentioned, you prob can't see this leak with the manifold installed.

maggiesadie8525

Hi VetteRed1965, what did you use to clean the mating surfaces?

VetteRed1965

Denatured alcohol from a local hardware store.

DUB

I generally clean cast iron surfaces with acetone or rubbing alcohol.

Depending in whether the gasket stick or some stays behind when the intake is pulled. I use a single edge razor blade to clean the surface. I do not use the 3M Roloc discs (fabric scuff type of rubber tipped type) because they can sling crap into the lifter valley. I do use the 3M discs when the part is off and can be cleaned without the chance of debris getting into the lifter valley...and YES...I know about laying material in the valley...but I still do not like getting stuff into the valley and also intake runners...which I also know can be filled with fabric.

I DO NOT USE the 3M discs on aluminum at ANY TIME. I fix/repair so many Tuned-Port engines where some "BOZO" got into it with a disc and almost ruined the runners and plenum...and created such a wicked vacuum leak...you can hear it with the hood shut...NO LIE.

DUB

MikeM

I know you said the manifold hadn't been cut. Nothing said about the heads or the block however, if you have no prior history on that engine, you have no idea what's been done to it.

When you get the manifold off and get the mating surfaces cleaned up real good, put the intake gaskets on the heads and set the manifold back on the engine. See how much gap you have between the manifold and the front/rear ends of the block.

Also, when you get the manifold off, you can look in the intake runners and see if they have been sucking oil.