2002 350 Mag mpi vibration

[bobterisch]

Hi all,
launched 2002 350 mag mpi this morning. When cruising noticed a outdrive (I think)vibration when turning left or right. I could feel it at idle but it is more noticeable at higher RPM's. No vibration when going straight. Took boat home and pulled drive. Props turn freely, u joints feel good, alignment tool slides in perfectly and gimble bearing also feels good.
Any suggestions greatly appreciated.
thanks

 

[Bt Doctur]

If the gimbal bearing is not seated fully it will hit the yoke and center section at full L or R ,other than that its a U joint
See if the bearing cap rotates in the inputshaft, center section or input yoke

 

[bobterisch]

Thanks for the reply. Caps do not rotate and I do nor
see any evidence of yolk rubbing gimble bearing. No issues last season either. Could u joints be going bad without me feeling anything by hand?

 

[Bt Doctur]

If not a damaged prop or prop shaft then are they greasable one`s? Consider the cost of the U joints vs the repair cost when they explode at 4200 rpm

 

[bobterisch]

Hi
Not greasable, I will replace them. Ismitmamgood idea to,do the gimble bearing while I have drive off? It's at least 4'years old.
Thanks

 

[Bondo]

Could u joints be going bad without me feeling anything by hand?

Ayuh,.... The cross bearings can get rippling 'round 'em, 'n you'll never know, til ya pull a cap off,...

The gimbel bearin' is yer choice,....
I don't change 'em, unless they Feel like it's necessary,....

 

[bobterisch]

Thanks for the replies

 

[bobterisch]

New u joints fixed problem. Thank you.