Author Topic: Oil seals on Stihl MS660 keep going bad.  (Read 242 times)

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Offline 3000 FPS

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Re: Oil seals on Stihl MS660 keep going bad.
« on: January 02, 2020, 12:45:25 am »
If the crank is smooth where the seal rides on it and the seals are the correct ones then I do not see how they would go bad.   Plus you said you did a pressure test on crank case and it holds pressure for 20 minutes.   I do not believe the seals are your problem.   I would be looking for a air leak some place else like cut4fun mentioned.  The impulse or the intake boot and I would even check the fuel line.   Heck I would even suspect the carb as possible problem too.   Have you tried adjusting the carb to see if you get different results. 

When tuning a saw it can sure act different when it is hot as apposed to when it is cold. 
PP 505, 475, 445.
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