'89 Evo Engine Leaking Oil
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Stage I
Joined: Mar 2012
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From: PA
'89 Evo Engine Leaking Oil
89' Evo Engine is leaking oil from the sprocket side of crankcase into primary. I replaced the sprocket shaft seal twice and it still continues to leak very heavily. I had heard of bad crank case castings during this year. Does anyone know of anything that could help me?
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Joined: May 2007
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The stock seals are single lipped and meant to keep dirt and crude plus primary fluid out of the motor but not necessarily motor oil out of the primary. Since I run a dry primary (open belt drive) I flipped the seal around to prevent leaks from the crankcase. I also put high temp silicone around the seal. There's a double lipped seal available which seals both ways, and that's probably best. The bottom line though is most of these seals leak. It's a weak design. But with an enclosed primary not many people notice it.
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