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Manage My Life

my riding mower generates lots of light sky blue smoke while running. Can I repair it my self?

by Manage My Life Last activity date:
June 18th, 2010

It is craftsman model 917-272672, motor model 31c 707-0230-E1. I like to fix it myself since I have the time, space and tools. Is the problem usually associated with the cylender head ot just one of the gaskets that need to be replaced?

Craftsman , Lawn Mowers
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Answers (2)
Manage My Life
Several things can cause the engine to smoke. Blue or white smoke is usually caused by the engine burning oil.

Lawn mower engines run with the crankcase in a vacuum. The engine has a crankcase breather that lets the air out of the crankcase. If something on the engine is leaking oil, it will also leak air into the engine crankcase. If pressure is built inside the crankcase, the pressure will force oil past the rings and cause the engine to smoke.

If a head gasket is blown, the air drawn into the engine will cause it to smoke.

I would clean the engine and look for an oil leak before taking anything apart. Check the sealing gasket in the oil fill and dip tube cap. Look closely at the o-ring that seals around the oil fill tube.

If you don't find oil leaking remove the head and inspect the gasket for an area that might be blown. Usually it will be toward the center of the head so it it leaking into the crankcase instead of outside.

You could also have a problem with the rings or a scored cylinder wall. If you pull the head, rotate the engine so the piston goes down and inspect the cylinder wall for wear or scratches.
Answered in 20 hours
by Manage My Life
June 18th, 2010
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afritz afritz
Hi Monir, I myself and I'm sure others as well have wanted to repair a broken item that belongs to us due to the cost of paying someone to repair it and also just getting that knowledge to know how to fix it just in case you have to deal with that problem again you already know what to do. A suggestion that I could give you is going to the SearsHomeServices website and finding out what you can do to repair it. I have provided the link below for you if you are interested. Hope this helps!
Answered in 2 hours
by afritz afritz
June 17th, 2010
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