Oil coming out of exhaust
 

Engine Guru's:
I have just developed a problem with my new engine. Oil is coming out of port side thru transom exhaust. Engine only has 10 hrs on it. The engine has had a slight miss between 1300 and 3000 rpms--totally goes away higher than 3000 rpms. Now oil is coming out of port exh BAD. Motor is a 540 shortblock, NA, Dom 1050 carb, KE exh. Checked the plugs and number 5 was super wet with carbon and oil.

Checked the wire and OK.
Replaced the plug and NO HELP.

What would cause oil coming out of exh?????????????????
Broken ring???????????

YEP...broken ring

You need to do a leak down test. That will tell the story. Probably lifted a ring land in the piston.
Eddie

How do you know it is oil and not fuel? They both present the same in the water. Does the engine have significant blowby out the breathers?

Had the same problem before. Motor had a broken oil ring

could be a bad oil cooler.

then why only on one side and one hole ? this motor, i imagine has multi piece oil ring so either it was misassembled and trapped the expander over a rail or it broke a land like eddie says. either way... a leak down is on your list of things to do followed, i imagine , by a comprehensive disassembly .

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I pulled the exh manifold today and OIL is definately coming from the #5 cyl out the exhaust. That rules out fuel and cooler problems. I'm pulling the motor.

It has to be a broken ring--RIGHT???????

I'm getting really good at working on this motor. This will be the 5th or 6th time the motor has been pulled, and motor only has a total of 30 hrs on it. Man am I lucky!!!!!!!!!!!!

Hole in piston?