F-20 flywheel installation

kglo · Aug 24, 2009

Does anyone know where I can find the driver tool to reinstall the flywheel in my 38 F-20?

J.J. from Afton · Aug 24, 2009

I have heard of people using heat, in that they heated to around 400*F in an oven so than it would slide right onto the crankshaft. Others I have heard of making a tool like the one you are talking about for I have no idea of where you might find one. The way I put mine on my Regular is rather frowned upon as it places a large horizontal load on the ball bearings holding the crankshaft. Mine I used assembly lube on the flywheel surface, than started it almost halfway on with a rubber mallet. Than I used a series of bolts and large washers and spacers threaded into the tapped holes (the ones that hold the flywheel housing) on the block to pull the flywheel on. I had no trouble as long as it is pulled evenly, like mine i only did 1/2 turn on each bolt and went around in a circle. Than using a large tap i ketp the two half circles lined up for the lock pin. To get the pin in I used assembly lube than threaded it onto the end of a slide hammer and it went in pretty easy.

Hope this helps you
-Jordan

504-2 · Aug 25, 2009

Check in over at nebraskacowman. but I think Howard told me he just used a block of wood and a big hammer but if you are in the Midwest there are some guys over there that have the tool. Just load up for a road trip, install and go back home.

Pacef20s · Aug 25, 2009

I rigged up a hanger that let the flywheel hang straight, heated up the flywheel on a grill until water just sizzled when dripped on it, and it slide right on. Be prepared with the key so that you get the flywheel aligned correctly. You only have a minute or so after it is on the crank before it tightens. Be sure it stays fully on he crank and get the nut on to keep the flywheel fully on the crank. Be sure to have gloves that will allow you to handle the hot flywheel. I used welding gloves. Good luck, Roland

spiffy1 · Aug 26, 2009

I'm a fan of heat, but on the 22-36 I put together last spring, it was so cumbersome, I knew that alone wouldn't be an option:

Pretty sure the F-20 cranks have the internal threads as well, but since I haven't tried this on anything else may have to eat my words.....

Anyway, pull out the pilot bearing oiler (good excuse to replace the pilot bearing too!) and screw in a some ready rod [actually, I cut the end off a bolt and made an adaptor for my sleeve puller as that 22-36 has a pretty big thread compared to what I have laying around in ready rod] and you're good too go.

F-20 flywheel installation

kglo

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J.J. from Afton

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504-2

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Pacef20s

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spiffy1

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