Vibration in Mercruiser 120hp, 1971 SeaRay

mana2leon

Member
exMember
Joined
Jan 1, 2000
RO Number
710
Messages
30
Last fall the previous owner pulled the engine as there was gas in the crankcase and when he had tried to start it there was gas in a cylinder so wouldn't turn over.
Now, after putting the engine back in, at idle it runs smooth, give it about 1,000-2000rpm there is a vibration and then it smoothes out. It bothers me and I'm afraid of tearing it up.

Also, I've heard that this engine is the same as a 1971 Chevy II car engine! Any truth to that?
 
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