removing alternator with stripped starter clutch

Howdy folks,

As you know, I have removed the engine from my 91 CB750 nighthawk and
installed a newer one. The old engine has a stripped sprag-style
starter clutch. However the new engine did not come with an
alternator, so I am trying to get the alternator off of the old
engine. Problem is I cannot get any torque on the central bolt that
holds the alternator onto the alternator shaft, because the shaft
turns freely (due to the faulty starter clutch).

Can you guys think of any way to keep this shaft from turning short of
splitting the crankcases, which is what I was trying to avoid in the
first place?


thanks again,
Andy

 

this may not help with your exact problem but i'll mention my experience
swapping '82 cb750 rotors in case it helps once you get that nut off.
(also, I'm not sure why the starter clutch matters.) all I did was put
the two engines in top gear and a couple of bursts with a cheap electric
torque wrench did the trick. but the rotors were still tightly pressed
on. a tip on another group mentioned that the rear axle can be used as
a substitute for the factory puller. again a couple of short bursts and
the rotors came loose.

 

oh I just noticed that the '82 and '92 models have quite different
alternators, sorry if previous post wasted your time, but an electric
torque wrench might still come in handy if you don't have an air wrench.

 

Albrecht and others,

Sorry if I seem thick, but I am very confused! However I am slowly
starting to understand this better.
These are all good suggestions for stopping the crankshaft from
turning, but that is not the problem. The problem is that the
alternator just spins independently of the crankshaft.

The transmission is in gear, and the crankshaft is not turning. The
alternator still spins freely on its shaft, along with the starter
clutch. If I try to torque the alternator rotor bolt, it just spins
freely. The crankshaft doesn't turn at all.

So it appears that either a) the alternator driven sprocket is
(contrary to Albrecht's knowlege) connected to the alternator shaft
via the sprag clutch or b) the alternator drive chain is broken (or
for some other reason not driving the alternator).

Any thoughts?

 

Albrecht and others,

Sorry if I seem thick, but I am very confused! However I am slowly
starting to understand this better.
These are all good suggestions for stopping the crankshaft from
turning, but that is not the problem. The problem is that the
alternator just spins independently of the crankshaft.

The transmission is in gear, and the crankshaft is not turning. The
alternator still spins freely on its shaft, along with the starter
clutch. If I try to torque the alternator rotor bolt, it just spins
freely. The crankshaft doesn't turn at all.

So it appears that either a) the alternator driven sprocket is
(contrary to Albrecht's knowlege) connected to the alternator shaft
via the sprag clutch or b) the alternator drive chain is broken (or
for some other reason not driving the alternator).

Any thoughts?

 

Albrecht and others,

Sorry if I seem thick, but I am very confused! However I am slowly
starting to understand this better.
These are all good suggestions for stopping the crankshaft from
turning, but that is not the problem. The problem is that the
alternator just spins independently of the crankshaft.

The transmission is in gear, and the crankshaft is not turning. The
alternator still spins freely on its shaft, along with the starter
clutch. If I try to torque the alternator rotor bolt, it just spins
freely. The crankshaft doesn't turn at all.

So it appears that either a) the alternator driven sprocket is
(contrary to Albrecht's knowlege) connected to the alternator shaft
via the sprag clutch or b) the alternator drive chain is broken (or
for some other reason not driving the alternator).

Any thoughts?

 

I don't know why that posted three times, sorry about that.