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Curtis B.
Curtis B., Technician
Category: Small Engine
Satisfied Customers: 25687
Experience:  have worked on and around most engine models for 35 yrs./Polaris ATV expert
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Curtis this 27hp Kohler propane on the Bob Cat Mower runs

Customer Question

Curtis this 27hp Kohler propane on the Bob Cat Mower runs about 20 min then starts smoking like a freight train. Give me some direction. Compression is about 175 both cyl
Submitted: 7 months ago.
Category: Small Engine
Expert:  Curtis B. replied 7 months ago.

Oil level correct? Not over full? one cylinder or both? Check spark plug for fouling, showing which cylinder. Are valves adjustable? Are they set and not too tight? If all is well with oil level, and valves, I would suspect yu have a head gasket that is leaking and letting oil be sucked into the cylinder.

Expert:  Curtis B. replied 6 months ago.

Did you find the problem?

Customer: replied 6 months ago.
Not yet. Guess I'll have to pull heads don't see the fouled or oil soaked plug
Customer: replied 6 months ago.
Because oil level fine, hydraulic valves
Expert:  Curtis B. replied 6 months ago.

Neither plug shows to be oily? And oil is not thinned from gas in the oil. Head gasket would be next.

Customer: replied 6 months ago.
Expert:  Curtis B. replied 6 months ago.

Or , just thinking, locate the vent line from the crankcase, going into the air intake , usually right at the air cleaner, and remove the hose, and see if it is filled with oil. Oil may be coming from crankcase, into the air intake.

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