Oil Film on M Breather Cap

When I work my M hard at high speed while bush hogging, I get an oil film at the breather cap and on the air cleaner breather pipe. Doesn"t drip, just a heavy film.

What would cause this?

Thanks in advance for your response.
 
Oil vapor condenses on any surface cooler than its liquid temp. (almost anything it touches cooler than 350 degrees) Thus normal oil vapor deposition (never visible or an issue on pollution controlled cars from about 1973 due to adopted positive crankcase ventilation regulations)is to be considered normal. Jim
 
Sounds like crankcase blowby going out the vent tube into the air cleaner inlet pipe.

Check that the large breather tube (it runs from the tappet cover down to behind the left frame rail) is not plugged, kinked or otherwise restricted.

If the breather tube is clear the problem is excessive blowby - time for a ring job or engine rebuild.
 
No live pump. It's a 1941 with the belly pump.

I took the crankcase breather tube off and cleaned it. While a little cruddy, it wasn't plugged shut
 
Whats the condition of the air cleaner itself? There should be enough suction to pull the vapors from the tube through the air cleaner, if its all stopped up, it might not be pulling the vapors through, but there again that would probably cause running issues if it were that bad.
 
So the 'breather cap' you're talking about, are you speaking of the air breather intake? Does it get oily?

Allan
 

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