Volvo Penta 4.3 with SX drive

krazykatz911

Petty Officer 2nd Class
Joined
Aug 21, 2010
Messages
123
Ok, was experiencing knocking noise in engine/drive area. Dealer replaced gimbal bearing and entire drive shaft assembly (with u-joints).

Ok, Took boat out today. No more knocking at all. The only thing that is wrong now is. when at 1/2 to full throttle, there is a vibration, you can hear it and feel it in the floor of the boat. But if you trim it up some, 90% of the vibration disappears. Any ideas?


Also, I use high octane, plugs just replaced, runs good, but on shut down after running it, it always diesels. Cannot figure out how to cure?
 

Gary H NC

Fleet Admiral
Joined
Dec 1, 2005
Messages
8,972
Re: Volvo Penta 4.3 with SX drive

I would take it back to them.....something may not be right.

As far as the run on or diesel after shut down try using 87 octane that the boat was designed to run on.
 

Gary H NC

Fleet Admiral
Joined
Dec 1, 2005
Messages
8,972
Re: Volvo Penta 4.3 with SX drive

Hard to say without pulling the drive. If it did not have the vibration before they worked on it then possibly a defective u-joint or bearing was installed or the bearing was not seated all the way.
Also be sure to ask if they checked alignment.
 

krazykatz911

Petty Officer 2nd Class
Joined
Aug 21, 2010
Messages
123
Re: Volvo Penta 4.3 with SX drive

Hmm, when they installed the gimbal and drive, I was there. Didn't see them check any alignment.
 

krazykatz911

Petty Officer 2nd Class
Joined
Aug 21, 2010
Messages
123
Re: Volvo Penta 4.3 with SX drive

Is it easy to remove the outdrive and check the alignment? What are the procedures for checking the alignment and getting it perfect?
 
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