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OC-4 Smoking

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Rich Hurley

09-06-1999 20:32:10




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I am having trouble figuring why my OC-4 (3cyl.gas) is sending out oil smoke. All cylinders?? and Head. Compression is good
130+. I changed with new oil..?? still making
smoke.. Any ideas..Thanks Rich




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C. Ziegler

09-08-1999 09:35:21




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 Re: OC-4 Smoking in reply to Rich Hurley, 09-06-1999 20:32:10  
Rich, another good test to try is the following: Check your compression again as a benchmark. Then pour about a tablespoon or two of motor oil, into the cylinders through your spark plug hole. Wait about 15 seconds for the oil to make its way out to the cylinder walls, screw in your gauge, and recheck compression. The idea is that the oil will act to seal worn rings so if the compression improves a significant amount after adding the oil and checking it, the rings need to be replaced. If not, then suspect the guides. If you end up replacing the rings, I would probably go ahead and do the guides and the valves (measure diameter to determine if valve replacement is necessary) anyway to eliminate leakage past this area anyway.

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charles stangeland

09-06-1999 23:41:27




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 Re: OC-4 Smoking in reply to Rich Hurley, 09-06-1999 20:32:10  
my first guess is that it could be that your intake valve guides are wore out. A good test for that is to run the engine at an idle for say 30 sec to a min (thus producing suction at the valves and valve guides). Then rev the motor the smoke should be bad. Then put the engine under a load (if possable) and run it faster (thus creating less suction at the area in ?). The smoke should be less if worn guides are the problem.
My second guess is that there might be rings stuck in their groves or broken rings. But unlikly due to the good compression. Hope it all works out for ya
Charles

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