Strange Crankshaft

[Cometeguy]

I just bought what appears to be a 49-53 Merc crankshaft (large holes in rod journals). It appears to be serviceable with a regrind. However, the front pulley shaft has been partly turned to a smaller diameter. See attached picture.

There appears to be enough metal to support the gear and pulley. However, I cannot figure out why someone would turn the middle of the pulley shaft. You can't get a sleeve on it and there is nothing to center the slinger.

Any one seen one like this? Any ideas on why it would have been machined this way?

Gary

[Barlea]

Is it possible that modification is what's left of a marine front drive? ..B.

[John Kennedy]

Or an industrial pump application?

[JWL]

Or, an area which has been worn as a result of many rotations of a slipping drive hub.

[Pete]

Or maybe it was metal sprayed originally to repair and the spray material came off.

[Ol' Ron]

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At least you can install the cam drive gear. The rest is going to take some thought. First a keyway then a machined collar, split in two pieces. Them a special belt pulley. OR something like that, I'm sure a good machinest could figger out something. However a good used crank might cost less.

[flatjack9]

Is it possible that the piece is screwed in to the end of the crank?

[super flat]

Why not machine the rest and then a simple one peice sleeve? Have a great day Gary

[flatjack9]

What is the diameter of small area? I think the normal crank snout is a little over 1.3 inches.

[Ol' Ron]

Just thought of an easier way to fix that. Make a key way in the shaft, make a key the stock height, make a split collar that fits in the shallow area, use stock seal sleeve, use stock pulley pulley.