1990 Larson w/5.0 mercruiser vibration

[spudtom45]

I just pulled a 5.0 w a cracked block(not winterized), rebuilt a nice 5.0 out of a van, but reused heads, intake, etc... Problem is a bad rumbling vibration when you crank it or start it, causes the outdrive to jump around a bit. This is the first inboard I've ever replaced, any insight would be appreciated.

 

[Bt Doctur]

Interesting. you would have had to remove the outdrive to replace the motor. most would test run the motor before install a drive, just in case.
Installing th drive and now having a noise could indicate a drive issue.

 

[spudtom45]

I unbolted the engine and lifted it out, I didn't pull the outdrive, should I have? It slid back together good.

 

[Bt Doctur]

your engine alignment is off, and your destroying the coupler

 

[Bt Doctur]

http://www.boatfix.com/merc/Install/gas/86017211.pdf

 

[bondo]

I unbolted the engine and lifted it out, I didn't pull the outdrive, should I have? It slid back together good.

Ayuh,.... My guess is, ya bent the drive's input shaft,.....

Pull the drive, 'n try startin' it,....