Greag
Do you know if you definitely have a CB crank rather than a CL one which doesn't have the lube oil for the starter bush?
G
Rebuilt engine seized
Hi Graham
It was a roller bearing and the correct crankcase. I am pretty sure the oil feed and bearing hole were aligned as looks like some aluminium from the bearing has gone up from the bearing. I have managed to get the bronze bush and damaged bearing off the crank, all the other bearings are OK but I think the surface the damaged bearing sits on is not good so I will need a replacement crank section, bearing and rebuild or replacement crank. There is a bit of scoring on the inside of the crankcase but I guess not a problem as long as all the swarf is cleaned out. What is perplexing me is that although it is clear the bearing has been starved of oil, I still do not really know why it happened. The feed hole was clear apart from the Al lumps which I think have come from the bearing and I have also checked the oil gallery at the front of the engine which seems clear based on air passage. The only thought I had was that the bearing was already damaged as the engine was definitely run with the oil feed blocked before I stripped it down. Greg Glenn
If you can email me some pictures - I'll share them on your thread and show you how it's done. I wonder if the roller cage broke up and caused the damage? G
'60 C77 '60 C72 '62 C72 Dream '63 CL72
'61 CB72 '64 CB77 '65 CB160 '66 Matchless 350 '67 CL77 '67 S90 '77 CB400F
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