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Duane Davis

My Craftsman GS6500 riding lawnmower with 54" deck occasionally spews white smoke while mowing in 3rd gear, why?

by Duane Davis
April 26th, 2010

Craftsman model GS6500, 54" mower deck, 26 HP Kohler Pro engine. I did a small test on a hunch and it doesn't seem to blow smoke when I mow in 6th gear...I didn't try them all. I couldn't detect any distinct smell from the smoke, but it seemed a sweet rather than acrid. It started last season after I changed the oil at 50 hours of use....not sure how I could have screwed that up since it was literally drain old oil, take off old filter, put new filter on, fill with Craftsman oil recommended by the Sears guy. Today it was spewing a lot more smoke than it ever had before, and much more frequently. At the end of last season I figured it was just a spot of oil might have dripped onto the engine, but that's not the case since it's been thuroughly washed since then. I smelled the oil that's in there, and it smells slightly like fuel, but I'm not sure if that's normal for the type of oil used either....thoughts???

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Craftsman , Lawn Mowers
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2 Answers from these members:
Manage My Life
White smoke is created when the engine is burning oil. Check the oil level in the engine and look closely at the oil for gasoline mixed with the oil.

Several things could be causing the engine to burn oil. The drain that lets the oil from the valves and lifters drain back into the crankcase might be stopped up in one head.

If there is an air leak into the engine it can cause the pressure to build in the engine and force oil past the rings.

Whatever is happening must not be doing it all the time, but is sounds like it is getting worse.

I suggest you schedule service and get a Sears technician to diagnose the problem.
by Manage My Life
April 26th, 2010
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