Posted by ScottyHOMEy on November 03, 2009 at 05:00:46 from (71.241.194.40):
In Reply to: Re: Tight C posted by RalphL on November 03, 2009 at 04:32:14:
Depends on the color of the smoke. Black smoke would be fuel. Blue is oil.
It's altogether possible the rings haven't seated yet and, depending on how the tractor was kept after the rebuild, they could be stuck, either from gummed up oil from sitting or even light rust.
If the smoke is bluish and persists after another ten hours or so of warm running, you might want to try one dose of an additive like Seafoam, 1/2 can in the crankcase oil and the rest in the fuel tank, to free them up and give them a chance to seat. If the smoke clears up beforehand, I wouldn't bother with the additives. If you do use one, change it out after another ten hours or so and go back to straight oil.
One other thought. If the smoke is oil, and is more pronounced for the first few minutes after startup, it could be worn valve stem guides, often overlooked on rebuilds. If that is the case, and the smoke clears up as the head warms up, the problem isn't too sever and could be fixed with a set of valve stem seals. They weren't originally put in the motor, but they're commonly included in a lot of gasket and seal kits anymore, and are readily available otherwise.
Still, if it were mine, I wouldn't pursue that until the motor has been given a chance to break in.
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