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Good afternoon everyone, having successfully managed to remove my right side main crankshaft seal, I noticed that the outer race of the main crankshaft bearing rotates in the crankcase, whilst the inner race seems tight on the shaft. I cannot detect any play as such, but I think I expected the outer race to be tight and stationary in the crankcase. Can anybody shed any light on this? Is it normal? Any thoughts would be greatly appreciated.
Cheers Andre -
Hi Andre, both bearing races should not move this means your crankcases are worn out. I would assume this is either TS 125 or ETZ 125 but as you mentioned TS250/1 this is very uncommon.
Best option to tackle it is to replace both cases for a known good pair, alternatively you can fit a new bearing using a bearing fitting compound like Locktite.
Third option, expensive and not really worth doing is to sleeve this bearing journal and have it line bored. -
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Depending on the degree of ‘looseness’, one bodge would be to raise ‘pimples’ of aluminium evenly around the inner recess where the bearing fits, accompanied by Loctite ‘bearing fit’. But it does depend on the amount of wear and ‘play’.
Use a small pointed punch. -
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