pitted prop shaft bearing surfaces

[monk-monk]

I have an old ('64-'65) lower unit that i need to rebuild, but the prop shaft is pitted on the bearing surface for the carrier bearing. I thought i seen something about a bearing that has an inner sleeve to ride on instead of the prop shaft surface...anyone heard of this? Any ideas would be appreciated..! Thanks

 

[Moody Blue]

Re: pitted prop shaft bearing surfaces

There is a product called speedi sleeve but not sure if it is suitable for all applications.

Other option that I just learned about from these forums is called hardfacing. A good hyrdaulics shop can repair the shaft for you.

 

[monk-monk]

Re: pitted prop shaft bearing surfaces

Thanks Moody Blue...I'll do some research on that! I would still like to get those hydraulic testing instructions to you!

 

[emckelvy]

Re: pitted prop shaft bearing surfaces

Speedi Sleeves work OK for worn oil-seal surfaces but aren't hard enough to carry needle bearings.

The surface would have to be weld-repaired, machined, heat-treated and straightened, or some sort of metal spray or refacing as suggested that met the hardness requirements (Rockwell 60 or better is typical of the original equipment). If that's even possible.

If the shaft repair isn't hard enough, the bearings are just gonna beat the Snot out of the repaired surface.

Here's a very illuminating discussion at the Scream and Fly racing forum about this very topic:

http://forums.screamandfly.com/forums/showthread.php?t=204658

You might be better off (and cheaper) trying to find a good original shaft or even upgrading the motor with a later model lower unit. Depending on the model, it's possible to adapt a later-style L/U to an older motor with the funky brass-cam reverse-lockout setup. For the price of a shaft repair (if one really exists) you might find an entire lower unit.

HTH & G'luck...........ed