Bad Vibration

L

live2ride

Recruit
Joined
Aug 17, 2010
Messages
3
Hi there. I have a 1996 scarab with a 4.3 and a alpha one drive. Last week i replaced the engine. Ive since had the boat out a few times and the thing is running great. Everything seems to be good except now im getting a good amount of vibration. The outdive went on with ease and the engine seems to be sitting in the same place as before. Is poor engine alignment a possible culprit or may there be some other explanition.
 
S

sea wolf

Lieutenant Junior Grade
Joined
Apr 3, 2002
Messages
1,219
Re: Bad Vibration

live2ride said:
nope, dont have one
Click to expand...
Well, u need one. Pull the drive, check the u-joints for slop & line up the engine coupler with the gimbal bearing. The tool can found on ebay for around $50.
 
S

sethjon

Senior Chief Petty Officer
Joined
Jun 8, 2010
Messages
692
Re: Bad Vibration

Out of alignment definitely could be the problem. When you pull the OD check the u joints which could also be the problem.
 
BAproject

BAproject

Petty Officer 1st Class
Joined
Sep 2, 2009
Messages
276
Re: Bad Vibration

is the harmonic balance new as well....or did it come from the other motor. Might be bad or wrong balance if you swapped
 
L

live2ride

Recruit
Joined
Aug 17, 2010
Messages
3
Re: Bad Vibration

I actually used a short block from a s-10 pick up. The harmonic balancer i used is from the orginal boat motor...
 
Alpheus

Alpheus

Lieutenant Commander
Joined
Aug 3, 2009
Messages
1,759
Re: Bad Vibration

Pull the outdrive and run the engine, see if the vibration goes away. If so you found the answer...

Always,Always,Always use an alignment tool EVERY time you pull the drive. You spent all this time and money replacing engine and you could end up destroying your gimbal bearing and or coupler do to the lack of performing a ten minute procedure...
 
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