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Donald
Donald, Small Engine Technician
Category: Small Engine
Satisfied Customers: 2050
Experience:  I have 25+ years of experience repairing 2 & 4 cycle engines
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I have a 10HP K241. It was smoking, I took it apart and

Customer Question

I have a 10HP K241.
It was smoking, I took it apart and found both the cylinder and piston worn out.
Took it over to the machine shop and had it bored to .030 over.
Fitted it with a new piston and rings .030 over.
The rest of the engine showed minimal wear. I refaced the valves and seats.
Guides are nice and tight.
Put it together and started and it is smoking.
At first I thought it was oil in the muffler. But it continued on and off after driving for a hour.
{It is the original engine in a C-101 Wheel Horse I have}
I pulled it back out and pulled the piston out to see if I broke a ring or ring land.
No problem.
I checked my ring gap on all of the rings, I have .013 gap.
I pulled the head yester day and oil is actually puddeling on the piston.
The vent system is clean.
Any Ideas?
I am thinking about changing the rings again.
Cylinder finish is perfect.
This is the 3rd one {K series} of these I have done in the last year with the same parts. And have had great success with the other 2.
Thanks
Bob
Submitted: 1 year ago.
Category: Small Engine
Expert:  Donald replied 1 year ago.

Hello Bob. Thank you for choosing Just Answer. My name is***** you checked your valve guides, breather assembly, and the oil ring on your dipstick. If there is a leak in crankcase vacuum, or excessive crankcase pressure, your engine will smoke.

Expert:  Donald replied 1 year ago.

The best to check for a cause, is by doing a Leak Down Test. This test will help to pinpoint our problem. This test will also reveal if your rings, or head gasket is at fault.

Expert:  Donald replied 1 year ago.

I would also check your cylinder head for warpage, just in case.

Expert:  Donald replied 1 year ago.

You and I can continue from here. Thanks!

Expert:  Donald replied 1 year ago.

Keep in mind, that if your rings are ok, you will need to focus on either excessive crankcase pressure, or a vacuum leak.