noise coming from back of the engine?

[betayv]

hello there I have a 1978 cruiser with a 228/305 mercruiser took the boat out for the first time this season I replaced the harmonic balancer like 5 months ago I can hear a noise coming from the back of the motor, outdrive working fine looks like the noise is coming from the outdrive shaft connecting to the engine any ideas last season not problem at all what could be thanks.

 

[Rocky_Road]

Re: noise coming from back of the engine?

Did you pull the engine to change the balancer?

If so...did you use an alignment tool when you reinstalled the outdrive?

If you pulled the engine, and simply placed it back where you found it...then I would suspect the coupler and/or the gimbal bearing have been damaged from mis-alignment.

 

[betayv]

Re: noise coming from back of the engine?

the harmonic balancer is on front of the engine I didnt pull the engine I didnt pull the outdrive either.

 

[Rocky_Road]

Re: noise coming from back of the engine?

The location of the noise suggests those two parts.

The outdrive is easy to pull off, and you can check the condition of the gimbal bearing, and check the alignment to the coupler. This should be checked every couple of years (many here do it annually)...especially if you are uncertain as to when this was last done.

 

[cr2k]

Re: noise coming from back of the engine?

My guess is the gimbal brg. try some greas in the zerk (starboard side of transom ring about the middle) 10-15 pumps should purge it. But once they start making noise they are usually on the way out or gone.

Pull outdrive and stick your hand in there and turn it and see if it feels smooth.

 

[betayv]

Re: noise coming from back of the engine?

ok Im gonna try to shot some grease and check if I can pull the outdrive to check the aligment and the bearing thanks guys.

 

[Rocky_Road]

Re: noise coming from back of the engine?

ok Im gonna try to shot some grease and check if I can pull the outdrive to check the aligment and the bearing thanks guys.

Good choice to try a little grease...but be sure to not overdo it, and add it while the outdrive is on the muffs and idleing in neutral.

Let us know the results...!

 

[searay3]

Re: noise coming from back of the engine?

Just stating the obvious...look at the condition of the bellows and ujoints while your in there...