SOHC.co.uk Forums > CB350/400
Should this shaft have end movement if I pull it by hand?
Nurse Julie:
If the pin hole is elongated, it may have been caused by the bearing spinning in the case as some stage in its life. Can you see any evidence of where the bearing may have spun?
McCabe-Thiele (Ted):
--- Quote from: Nurse Julie on July 20, 2021, 03:47:56 PM ---If the pin hole is elongated, it may have been caused by the bearing spinning in the case as some stage in its life. Can you see any evidence of where the bearing may have spun?
--- End quote ---
Tbh if the bearing had spun I would have expected the elongation to be radial rather than axial if those are the right adjectives. The crankcase looks odd due to shadowing but the slot for the bearing looks ok.
I have attached a photo if this helps.
bearing location is elongated by Macabe Thiele, on Flickr
Nurse Julie:
Those definitely look like partial spin witness marks. But, I agree, the ovality would be fore to aft, not port to starboard.
Edit, but if there had been side to side play on the shaft, that would account for the slight ovality being port to starboard.
smoothoperator:
I would have a look at mine Ted but I’m away. Make sure on the washer as it could easily have got misplaced. Hard to see that ovality giving 1 mm of float.
McCabe-Thiele (Ted):
--- Quote from: Oddjob on July 20, 2021, 04:46:44 PM ---Is the thrust washer behind the needle bearing Ted, there should be a 20mm washer between the bearing and the gear.
--- End quote ---
Yes, I assume you mean between second gear & the needle bearing.
The end float is more than the thickness of the thrust washer - if it was ever dished slightly it isn't now it's flat with some light rotation marks.
I've ordered a new needle bearing, thrust washer & lock pins.
The parts book shows 3 of those thrust washers are fitted somewhere in the gearbox so I've ordered all three anyway as they were cheap enough.
I can't see much point in stripping down the whole mainshaft as the endfloat is basically the gap between the fixed gear on one end of the mainshaft that fits up to the large bearing & the second gear at the needle roller end. Second gear sits next to a fixed circlip on wide splines so it can't really move anywhere except for the gap between it & the thrust washer.
As a last resort a second thrust washer might be a option ?
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