SOHC.co.uk Forums > CB500/550

CB500 k1 Primary shaft bearing spinning in case.

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Kai.chris:
Hoping somebody can help please…
 Should the primary shaft bearing that sits behind the oil pump be able to spin freely in the case? Just rebuilding the bottom end and concerned it’s not right.
In the correct position the bearing can just slide in and out of the casing easily.
Also looks as if the bearing on the other end of the primary shaft has also been spinning in case.

McCabe-Thiele (Ted):
That's definitely not right as I'm sure you have realised!

Bryanj:
No should not spin but not a press fit either, the bearing at clutch side is a slightly looser fit and is trapped by the quarter cicle steel plate held in with 2 bolts

Murf:
As already said you don’t want the bearings spinning in the housings so maybe use a Loctite bearing retainer when you assemble everything. There is a range of bearing retainer depending on the gap, I am guessing the gap you have will be very small so get the appropriate product. Get  the surface of bearing and housing clean and oil free before use. You will need very little so get a small bottle because it’s quite expensive. Try to get it from a reputable supplier as i believe there is a lot of fake stuff out there.

Kai.chris:
Thanks for all your replies.

I feel better now knowing Loctite make a product for this very problem.
The gap is very small indeed. Bearing will only slide in by hand once positioned perfectly.

Looks like Loctite 609 (up to 150 deg c) or 620 (232 deg c) will do the trick,, can’t find much info on suitability with oil though.

Will 620 be overkill? Not sure how hot these engines can get.

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