Topic: Output shaft bearing replacement?

[mattcb350f]

There are two bearings in the transmission of my 350F which are no longer available from Honda. They are the two large bearings, one of them being on the output shaft (sprocket shaft) next to the seal.

My bearings are fine. No grity spots and no side to side movement so I think they are still fine. I know I should replace them but that might be hard to do since I don't know where to get them.

If they were available I would just replace them but since they're not, I'm considering using the old ones.

What do you think? Has anyone reused these bearings or had bearing failure stories to share because they used old ones?

I read one post about a 400F blowing this particular bearing... but due to a bad seal

 Thoughts folks....

 Matt.

[mystic_1]

I've considered re-using old bearings before but the cost does not outweigh the risk in my opinion.  You should be able to read off the bearing number on the side of the bearing race and find an equivalent bearing from a variety of suppliers.

mystic_1

[City Boy]

The problem I think is the groove for the bearing retainer.The bearings themselves conform to International standard but the groove is not.If you cannot locate new,and your used ones pass a close inspection,use them.

[Bodi]

The groove can be ground into a new bearing. This is an open (no shields or seals) bearing so buy a sealed bearing (2RS or equivalent) to keep the insides clean during grinding and have the groove cut - a bearing supply house should either get it done or will know where to take it. Once the groove is done, pry out the bearing seals and wash the grease out with solvent. I had to do this some years back for a CB77 bearing.

[City Boy]

Good to know.Tks.Rock On

[Soos]

I have done a similar bearing modifications before.
I had to cut a step on the OD on a double tapered timken bearing once.

Any capable machine shop can groove a bearing race for you.
The smaller the shop(job shop) the more likely they are to be willing to do it for you.

I work at a large machine shop, and know of several co-workers with lathes and mills in their garage/basements.
They do oddball jobs that job shops shy away from.
Mostly due to the time involved just getting to the broken part.
at a min. of 60.00/hr... machine shop time can add up quick.


l8r

[mattcb350f]

Oke dokey, thanks fella's. My machinist should be able to cut a new grove, or make one wider.

Just one more question....

How does one get the bearings off the shafts? are they pressed on (requiring a puller) or what.

The Honda manual and Clymer manual completly ignore these bearings and make no mention of how to get them off, or diagnose them for that matter 

 cheers, Matt.

[bryanj]

As these bearings run in oil they rarely fail, as long as it is not rough and has no play i would re-use it.
Its also quite probable that Honda have upgraded to a new part number--have you tried asking at Dave Silver? and finally yes you need a press to get them off

[Cvillechopper]

I have been able to get them off and back on using a open end wrench just big enough to get around the shaft and a hammer.  Not a standard way to do it and far from the recommended method, but it can work.  You just have to make sure you don't hit the shaft, rotate the wrench after each hit, and use more of a tapping hit than trying to get it off all at once.  Make sure the end of the shaft that's on the outside of the bearing is on a block of wood or hard plastic, not metal or concrete.  The hard part is hitting the wrench close enough to the shaft to transfer the force while holding the wrench perpendicular.  I've used various assistants with this and found that a couple cardboard boxes stacked inside each other provide enough resistance on the outter end of the wrench to keep it parallel.  They crush a little bit with each hit about as far as the bearing moves(at least they did for me).

With the right precautions and patience, you can get it off and re-use it, no problem.  It is risky though so only use this method if you're willing to accept the possibility of dinging the shaft (that's not slang for anything Terry) or damaging the bearing. 

[ttr400]

The bearings on the main and counter shafts are both the same (part# 91002-286-008).
The main shaft bearing can be replaced. the countershaft bearing is part of the shaft.
The bearings and the countershaft are discontinued. I have found them on ebay from time to time.
To remove the countershaft bearing, support the bearing and use a press on the shaft.  first the oil seal collar will come off and then the bearing.  The oil seal collar has an o-ring fitted as oil is fed direct from the oil pump through the seal and collar to feed the countershaft.
However Bryanj is quite correct in that I have never found one that has needed replacing.
Hope you understood that. (Oh, the countershaft, also known as the output shaft)

Kevin