1978 Evinrude 75hp....just blew the lower unit!

BonairII

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Jun 7, 2011
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Lower unit seized up solid today. Gear oil only had a few hour on it.

In hindsight, I should have known that there was a problem with the LU. Last week, I loosened the screw to drain the gear oil and the oil EXPLODED from the hole and covered me head to toe....and the oil smelled awful!

I'm guessing that somehow the exhaust gases were getting into the gearcase somehow...pressurizing it.

Anyone ever heard of this before?
 
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