Posted by Tom Fleming on August 09, 2009 at 17:52:11 from (67.20.240.67):
In Reply to: S/C Engine Smoke posted by S/C Bob on August 08, 2009 at 16:49:36:
Bob, a slight bit of white/blue smoke that only occurs at idle and goes away under load has always indicated worn valve guides to me. Other people may disagree, but that is what my experience has found.
Now, if you are going to work this tractor hard, and expect strong performance out of it, invest in a valve job.
If you are going to run it once in awhile, and only moderately work it, then I wouldn't get to worried about it. Over time, worn valve guides will cause valve seats to wear oblong. This is over time. If they go too oblong, then wheel dressing new seats may or may not be possible, and the only solution is to have stellite seats installed. Not a crisis, but more money.
I wouldn't get too worked up until you decide to redo the engine. Rings, bearings, seals, etc. Then invest in a good valve job, which would include new valves, guides, springs, and keeps.
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