Slight oil leak on 300 around manifold area

ShawnAgne · Jan 21, 2018

Notice after I run it for awhile there is some oil that builds up on the ouside of the motor around the manifold. Particularly around the rectangular plate on that side that looks like could be removed (sorry I don't know the specific name). I know there is a gasket for the manifold but is there something else I should check/replace? I was going to touch up some of the areas paint wise and cleaning up and repainting the manifold was one of them so replacing the gasket was already on the list just want to stop the issue.

heavyhaulertoo · Jan 21, 2018

Sounds like the valve cover gasket is bad

ShawnAgne · Jan 21, 2018

(reply to post at 18:40:15 01/21/18)

Thanks. Since I will be pulling the manifold off should I replace that gasket then also?

Janicholson · Jan 21, 2018

The Valve Cover can leak down onto the manifold and make a mess, The side cover is also a place to leak.
it covers the lifters and it also has a gasket. The manifold can be painted, but the paint will burn off
unless it is ceramic coated (pricey but beautiful) Jim

ShawnAgne · Jan 21, 2018

(reply to post at 19:31:25 01/21/18)

When I repainted my Cub I got some very high temperature paint that a local guy who restores cars recomended. Has worked ok so far. Thanks for the advice on fixing the oil leak.

DR. EVIL · Jan 22, 2018

The cover under the manifold behind the carb is the coolant header plate. No oil there. The cast cylinder
walls are behind that cover and are completely covered in coolant. Valve cover gasket is leaking. Probably
the easiest gasket to replace. I wish somebody would make valve cover gaskets like Ford made for the 302 or
5.0 Liter years ago. It was steel stamping with rubber gasket material molded around it. The stock cork
gaskets sucked! Why would anyone think decaying tree bark would be a good gasket material? The new gaskets
were Life-Time parts, reusable, would not crack, break, move around. I think that type of gasket would be
a great improvement to the H & M series engines. Two part numbers could fit about two and a half million
of IH's 5 million tractors.

cuby · Jan 22, 2018

I think you should clean the area real good before attempting to fix the problem. After cleaning, run the engine to see for sure where the oil is comeing from and then go from there. Just my way.

BarnyardEngineering · Jan 22, 2018

You don't need to remove the manifold to fix the rocker cover. Unless there is some other compelling reason to remove the manifold, you may be better off leaving it alone, as removing it opens up the potential for broken off studs and other such tomfoolery.

pinball · Jan 23, 2018

Slight oil leak on 300 around manifold area

ShawnAgne

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heavyhaulertoo

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ShawnAgne

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Janicholson

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ShawnAgne

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DR. EVIL

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cuby

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BarnyardEngineering

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pinball

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