Generator Rotor Removal

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Generator Rotor Removal

RodneyCB750K1979
I first tried removing the generator rotor from the crankshaft using a gear puller.  No good.  I checked various forums and discovered the rear axle bolt fits the rotor hole (18mm - 1.5mm pitch right handed). I inserted two flat washers inside the rotor opening against the end of the crankshaft because the axle bolt end is tapered. I tightened the bolt to about 40 ft-lbs and the rotor did not release. The flat washers were concave from the force of the axle bolt. I applied some penetrating oil and greased the bolt end and threads well.  After tightening the bolt, I used the wheel spacers on the axle bolt as an impact. I quit after noticing the long bolt was no longer inline with the crank centerline.  I eventually shut the job down and ordered a rotor removal tool - which is only a bolt with a squared-off end.  Please share any experiences or helpful suggestions on removing the generator rotor from the crankshaft.

Attempting to remove rotor with rear axle bolt and oil filter wrench


Flat washers placed inside rotor hole against crankshaft
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Re: Generator Rotor Removal

TOOLS1
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Just snug up the bolt, then give it a smack with a hammer. It should pop right off. However sometimes you might need to snug up the bolt some more, and give it another smack, or a whack.
TOOLS
Life is not about the number of breaths, you take, but the moments that take your breath away.
I don't have an anger problem. I have an idiot problem. Hank Hill
Never confuse education for intelligence.
Happiness is a belt fed weapon.
I just can't imagine what could go wrong.
No fire? No explosions? So whats the point of your story?
Those who are too smart to engage in politics are punished by being governed by those who are dumber. ~Plato
It couldn't be done, but the darn fool didn't know it, and did it anyway.
We all got problems. Ksharp
I like vintage bikes because they take me away from the clutter of technology that I work with everyday and back to a simpler time of mechanical elegance and simplicity.. "ninadm"
Darkwing Duck: The worst part of public transportation is the Public.
"That is awesome shit there" Re-Run
"Fear nothing, attack everything" Eric Berry
" Oh, you read that on the internet? Clearly it IS a massive problem. Of course it CAN’t be normal operation."

1976 CB 750-A X 2
1977 CB 750-A X 4
1977 CB 750-K
1976 CB 750 F
1981 CB 750
1966 Kawasaki SG 250
1981 KZ 750 LTD
1973 CB 350
1979 CM 185 Twinstar
1982 Honda XL 80
South of Eden (Kansas City MO)
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Re: Generator Rotor Removal

RodneyCB750K1979
In reply to this post by RodneyCB750K1979
Here are some sketches of how the removal tool works.



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Re: Generator Rotor Removal

TOOLS1
Administrator
RodneyCB750K1979 wrote
Here are some sketches of how the removal tool works.



That's just how it is inserted. You still need to smack it with a hammer. If you just try to pull the rotor by tightening the removal tool, you will just strip the threads.
TOOLS
Life is not about the number of breaths, you take, but the moments that take your breath away.
I don't have an anger problem. I have an idiot problem. Hank Hill
Never confuse education for intelligence.
Happiness is a belt fed weapon.
I just can't imagine what could go wrong.
No fire? No explosions? So whats the point of your story?
Those who are too smart to engage in politics are punished by being governed by those who are dumber. ~Plato
It couldn't be done, but the darn fool didn't know it, and did it anyway.
We all got problems. Ksharp
I like vintage bikes because they take me away from the clutter of technology that I work with everyday and back to a simpler time of mechanical elegance and simplicity.. "ninadm"
Darkwing Duck: The worst part of public transportation is the Public.
"That is awesome shit there" Re-Run
"Fear nothing, attack everything" Eric Berry
" Oh, you read that on the internet? Clearly it IS a massive problem. Of course it CAN’t be normal operation."

1976 CB 750-A X 2
1977 CB 750-A X 4
1977 CB 750-K
1976 CB 750 F
1981 CB 750
1966 Kawasaki SG 250
1981 KZ 750 LTD
1973 CB 350
1979 CM 185 Twinstar
1982 Honda XL 80
South of Eden (Kansas City MO)
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Re: Generator Rotor Removal

LukeM
Administrator
I also recommend a bit of penetrating oil (PB Blaster is my favorite) to get the rotor off.  Sometimes a bit of rust gets between the rotor and the crankshaft, and it's amazing how well that sticks things together.

+1 on the hammer rap.  Just don't hit the rotor itself.

Luke M
Used to have a 1979 CB750L, sold it as a parts bike, now riding a slightly modified 1984 VT700C. Network/Field Engineer. Central OH, USA, Earth, Sol System, Milky Way Galaxy, Universe.
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Re: Generator Rotor Removal

shinyribs
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Ditto Tools. The threading in of the tool pushes the rotor off the crank,but the whack of the hammer is what helps break the bond of the two parts. Mine was stuck (SOHC,but same principle) and I didn't have any luck at first. I ran out of time and had to leave it for the night,but I left the tool tightened as far as I could without damaging anything while I was gone. When I came in the next day it was sitting there waiting for me...loose  
A free people ought not only be armed and disciplined, but they should have sufficient arms and ammunition to maintain a status of independence from any who might attempt to abuse them, which would include their own government.~George Washington



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Re: Generator Rotor Removal

RodneyCB750K1979
In reply to this post by TOOLS1
It worked!  I greased the bolt threads, screwed it in, torqued to 50 ft lbs, wacked the bolt head a few times, torqued again, wacked again.  I connected my wrench to torque again and the rotor spun.  Voila.
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Re: Generator Rotor Removal

RodneyCB750K1979
In reply to this post by shinyribs
You must have done it in your sleep walk :-)   Amazing what penetrating oil and time will do.
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Re: Generator Rotor Removal

RodneyCB750K1979
In reply to this post by RodneyCB750K1979
Post mortum comment: After all the whacking on the tool end, the edges knurled over a little preventing installation of a socket driver.  I had to file the edges back a little.  
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Re: Generator Rotor Removal

Pilotbob
In reply to this post by TOOLS1
What if I used the wrong puller. The claw kind. The bolt threaded into the camshaft and pulled out a bunch of the threads. Am I done for...?
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Re: Generator Rotor Removal

TOOLS1
Administrator
Do you mean "crankshaft"? Get a tap and clean the threads, and then try the bolt. The bolt does not really have a lot of stress on it, the taper on the end of the crank is what really holds the rotor in place.
TOOLS
Life is not about the number of breaths, you take, but the moments that take your breath away.
I don't have an anger problem. I have an idiot problem. Hank Hill
Never confuse education for intelligence.
Happiness is a belt fed weapon.
I just can't imagine what could go wrong.
No fire? No explosions? So whats the point of your story?
Those who are too smart to engage in politics are punished by being governed by those who are dumber. ~Plato
It couldn't be done, but the darn fool didn't know it, and did it anyway.
We all got problems. Ksharp
I like vintage bikes because they take me away from the clutter of technology that I work with everyday and back to a simpler time of mechanical elegance and simplicity.. "ninadm"
Darkwing Duck: The worst part of public transportation is the Public.
"That is awesome shit there" Re-Run
"Fear nothing, attack everything" Eric Berry
" Oh, you read that on the internet? Clearly it IS a massive problem. Of course it CAN’t be normal operation."

1976 CB 750-A X 2
1977 CB 750-A X 4
1977 CB 750-K
1976 CB 750 F
1981 CB 750
1966 Kawasaki SG 250
1981 KZ 750 LTD
1973 CB 350
1979 CM 185 Twinstar
1982 Honda XL 80
South of Eden (Kansas City MO)
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Re: Generator Rotor Removal

Pilotbob
Yes, crankshaft, thank you for the help. That is my first course of action.