15-02-2019, 10:43 PM
Phil, the A/C front main bearings should be mounted 'back to back'. This means the sides on which the OUTER races have the smallest INNER diameter (i.e. the outer races are widest) should both be in contact with each other.
When assembled there should be 0.004" pre-load between them. Clamp the two bearings together firmly and check if a feeler gauge will go between the outer races (n.b. one each side so it doesn't skew over). You need a shim the same thickness as the feeler gauge +0.004" between the outer races.
It's worth checking your bearings are the correct depth for the housing, as there were two variations. They should protrude from the casing by 0.015" so that they are firmly clamped by the cover plate.
The bearing lip is a known weak point often damaged by careless assembly / disassembly. They have been known to fail in service. Yours doesn't look quite terminal to me but depends how solid the rest of it is. I'm sure many members would say have it replaced then you need not worry about it.
Timing gear - replace the nut loosely so when the gear does come off it doesn't fly too far. Wind up the puller as tight as you dare. Yes, a little heat on the gear. Wind up the puller a tad more. Sharp smack with a drift and hammer. Don't do this in the crankcase.
When assembled there should be 0.004" pre-load between them. Clamp the two bearings together firmly and check if a feeler gauge will go between the outer races (n.b. one each side so it doesn't skew over). You need a shim the same thickness as the feeler gauge +0.004" between the outer races.
It's worth checking your bearings are the correct depth for the housing, as there were two variations. They should protrude from the casing by 0.015" so that they are firmly clamped by the cover plate.
The bearing lip is a known weak point often damaged by careless assembly / disassembly. They have been known to fail in service. Yours doesn't look quite terminal to me but depends how solid the rest of it is. I'm sure many members would say have it replaced then you need not worry about it.
Timing gear - replace the nut loosely so when the gear does come off it doesn't fly too far. Wind up the puller as tight as you dare. Yes, a little heat on the gear. Wind up the puller a tad more. Sharp smack with a drift and hammer. Don't do this in the crankcase.