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Clanking in engine or outdrive Not sure

don_harris

New member
"I have a 3.0 merc alpha 1. J

"I have a 3.0 merc alpha 1. Just replaced the engine with a running used one. After installing we started and timed. Engine sounded good. Installed outdrive yesterday and took to boat ramp and started on trailer. Engine vibrated violently and is making a clanking noise in the rear of the engine, I believe. What could this be? It just makes no sense, it sounded good without the outdrive on??? Please Help! Boat is sold and I want it to run properly before PU. Thanks for any suggestions?"
 
Could this problem be that the

Could this problem be that the alignment is not correct? Since it was not makiing the noise until the outdrive was installed? Engine Coupler? Would it make noise even if it was in neutral? Someone please help me. Dire need! Thanks! Don Harris
 
u-joints ok? upper gearset wou

u-joints ok? upper gearset would vibrate in or out of gear.coupler doesn't normally "clank" more of a grinding noise.
 
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