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I split the crankcase on said engine, but am unable to pull the
case off the bottom of the crankshaft as the driveshaft is attached
to the crankshaft some how, and evidently, slightly larger in OD, and
won’t slide thru the crankcase bushing. One can see the joint
(shown in photo), but there’s no pin attaching the driveshaft to the crankshaft.
How is it attached and how do I get if off???
Thanks!
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Prepare to be boarded!
If you are absolutely, totally, beyond a shadow of a doubt sure there is no pin, apply dry ice to the bottom bushing until everything is frozen solid. Then apply a hot torch to the hollow drive shaft . . . 😎
Garry in Tampa
I got the crankshaft separated from the lower half of the crankcase today.
The steel tube attached to the bottom of the crankshaft was too big OD
to slide thru the crankcase bushing, so it had to come off. I lucked out
eventually, seeing how I did not know how it was made or put together.
What finally made it come apart was heating the tube near the joint,
then tapping on the inner drive shaft with a brass punch. I was suprised
to see that the long "tang" was part of the crankshaft!Also was able to remove the brass drive shaft housing on the lower unit,
but that still doesn’t help me with getting the prop shaft and gears out
of the case. Not sure if the drive shaft is suppose to float free in the
drive gear, or is magically attached to the gear some how.
I put the driveshaft in the vise, and tapped on the gear case with a wood
block and hammer to see if the driveshaft would pull out of the gear,
but no movement noticed. Trying very hard NOT to break anything.
Ideas?
The gears look to be in good shape, but thought it would be best to have
an empty gear case when it came time to attach a new skeg, which
I "zero" ideas how to best do on this one!
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Prepare to be boarded!
Propshaft gearis typically held in place on the prop shaft with a set screw that is often hidden in the shoulder of the water pump eccentric. Clean the grease out and look through the hole where the water pump goes. If not a screw, there might be a pin, but most of the time its a slotted set screw.
Once the fastening thing is out (whatever it turns out to be) the propshaft can be driven out of the gear. Only after the propshaft gear is out of the way can you drop the driveshaft down far enough to knock out the retaining pin and pull the shaft out of the gears.
I’ve never seen a driveshaft and lower crankshaft stub ground down the way these look. There’s supposed to be a keyed sleeve coupler that fits over the crankshaft and driveshaft ends with fixed keys that fit into corresponding slots on both shafts. The pics of your motor show pieces that are ground down to next to nothing. I’m afraind that if you want to fix it correctly that extensive rehab work is going to be necessary on the crankshaft, and the drive shaft should be replaced entirely.
Here’s a look at a Wisconsin I owned a few years back. The lower unit isn’t correct, but the crankshaft and coupler sleeve are.
Best,
PM T2
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