QuestionKohler Command Model CH 20S
Spec# 64501
date of manufacture 2001
I have replaced float and valve. Changed oil and filter. Engine ran great. However, after approximately five minutes, began producing white/blue smoke. Removed oil down to app. 1 quart (holds 1.9qt.) such that oil stick showed oil at a little over "low" mark.
Ran great, for about five minutes and, again, white-blue smoke
Drained crankcase of app. 2 plus quarts of what I would estimate to be a 1:1 gas/oil mixture.
Have removed carburetor, no leaking gas observed (gravity feed gas line).
Removed valve cover where mechanical fuel pump is located. Observed rust on both push rods, much more pronounced on the rod the lifts the rocker arm that operates the fuel pump. Also, some rust on the one-way valve to carburetor. (Note: it was reported by cousin who had borrowed this piece of equipment that there was water in the crankcase and we puzzled over how that could have occurred.)
Do I replace the valve cover/mechanical fuel pump, to eliminate the gas into crankcase problem?
Do I replace the push rods, or, just clean them?
Thank you,
Mike Gamble
Dothan, Alabama
AnswerIf you're certain the carb is okay, then I'd replace the fuel pump assembly. You should be okay with just cleaning the push rods.
Personally, I'd go through the carb again just to be safe. It's really hard to say where the water might have come from. Ethanol blended fuels are hygroscopic and suck up water very quickly. Or it could come from rainwater. You'll have to examine how it's stored and look for sources for that one.
