SOHC.co.uk Forums > CB750

Engine full of fuel and seized up

<< < (31/50) > >>

MrDavo:
That gear wheel that is fouling the case took all the torque from the starter motor, trying to turn a crank that was locked solid. Is it possible that it is just now on the p*ss somehow, and the crank isn’t bent? The way it is fouling and leaving a witness mark makes me wonder, the main bearing hasn’t moved laterally looking at the picture. I can’t see the gear wheel bending, but nothing is impossible.

Possibly the starter clutch arrangement is damaged or bent instead, that would be a far better outcome than the crank. I had a tool to get the alternator off but nothing would budge, I ended up going to a local engineering shop. Trigger’s yer man there, however if it is now on skewiff then things may not be straightforward.

K2-K6:
Still something odd there as the crankshaft should rotate forward while leaving the starter gear stationary via it's sprag clutch.

It may prevent the starter motor from operating,  if it were damaged.  But the kickstart doesn't go through that way,  it's via the primary drive direct to crank and avoiding the starter gear.
You'd have imagined that the kick would still work in the above scenario.

Also if main bearings where dry,  it's likely that it would be consistent in resistance for whole rotations,  and not more pulse like.

McCabe-Thiele (Ted):
That gear does look very close I'm not familiar with your engine but how is the gear & flywheel located on the crankshaft is it a woodruff key & taper fitting ?
Is there any kind of spacer or thrust washer between the gaer and the crankcase any end float control?

Bryanj:
Generator is on a taper and there are no thrusts as there is no sideways force on the crank, unless you throw it down the road

McCabe-Thiele (Ted):
I'm thinking the woodruff key has moved as part of your troubles - I can't see the crank being bent given the circumstances. It's definitely a mystery it will be very interesting when you finally locate the cause.

Navigation

[0] Message Index

[#] Next page

[*] Previous page