750 SF2 Right Side Crank Seal Replacement

murphus

murphus

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Lost in the Midwest
Tried searching for info on the subject but came up empty. To wit, crankshaft seal leak, right side, 1974 SF2. Bike's been sitting. Belongs to a pal and he hasn't ridden it since I got it running for him 4 years ago. Might have been leaking then and I just didn't notice it. Any special considerations for replacement? Anyone done this, and if so what did you use as a puller for the starter clutch?
 
Don't fotget starter clutch nut is lh thread.
Proprietary puller is best for the freewheel but a 3 legged puller will work fine. Wrap the freewheel in a plastic bag to avoid rollers and springs all over the place.
Getting the old seal out is standard procedure. Chamfer the edges of the new seal, helps getting it in to the crankcase. Freezing it also helps.
No use changing seal if bearing is shot.
Paul
 
Don't forget there are two seals: crank main and starter sprocket (freewheel). Make sure the freewheel seal rubber isn't touching the starter clutch inside surface. Some lube the pins and rollers, I don't.
 
Paul Marx said:
Don't fotget starter clutch nut is lh thread.
Proprietary puller is best for the freewheel but a 3 legged puller will work fine. Wrap the freewheel in a plastic bag to avoid rollers and springs all over the place.
Getting the old seal out is standard procedure. Chamfer the edges of the new seal, helps getting it in to the crankcase. Freezing it also helps.
No use changing seal if bearing is shot.
Paul
Click to expand...
Paul, what bearing are you referencing?
 
Your bikes ‘74 and been stood for a while, the cranks seal leaking- same situation as mine was. I changed the crank seal but the gearbox seal and seal behind points started leaking- I bit the bullet and stripped the motor. I found the seals were braking up internally through going hard / brittle. I’m glad I stripped mine. Anyway, if you’re just going to change the crank seal, make sure you’ve got something suitable to drive it in square with- I removed mine using self tapping screw technique. You could smooth out the sharp edge of the crankcase to stop it catching/ galling as well.
 
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