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Posted by Andy on October 3, 2007, 11:18 am
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
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Posted by Albrecht via MotorcycleKB.com on October 3, 2007, 11:55 am
Andy wrote:
>
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).
I don't think that has anything to do with the starter clutch.
The sprag clutch is supposed to turn the alternator shaft, but only when the
starter turns the big idler gear. It is never supposed to stop the alternator
shaft at any time.
A chain connects the crankshaft to the alternator shaft, and chains are bi-
directional. If you put the transmission in gear and prevent the crankshaft
from turning, you should be able to loosen the single bolt that holds the
alternator from rotating.
Since you have the engine out of the frame, you might try wrapping the drive
chain around the engine sprocket to keep the countershaft from turning. The
crankshaft won't be able to turn with the transmission in 5th gear and you
holding the chain from moving.
Another way to stop a crankshaft from turning is to remove the clutch cover
and feed a shop towel between the primary gear on the end of the crankshaft
and the big gear on the clutch as you slowly turn the clutch.
You might also consider using an air impact wrench to loosen the alternator
bolt instead of using a breaker bar on it. Hundreds of tiny impacts from the
air impact wrench won't cause the crankshaft to move as much as the high
torque from a breaker bar.
--
Message posted via MotorcycleKB.com
http://www.motorcyclekb.com/Uwe/Forums.aspx/tech/200710/1
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Posted by Andy on October 3, 2007, 12:44 pm
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?
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Posted by Andy on October 3, 2007, 12:48 pm
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?
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Posted by Andy on October 3, 2007, 12:52 pm
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?
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