[quote="jenmassey"](quoted from post at 15:51:45 11/15/18)
They aren't too tough to do, go in knowing you won't be spending money wisely.
I did a Muldoon rebuild on a C about a decade ago. It leaked oil so bad that the clutch was like a torque converter and the front main leak ruined a front tire. You could put a pry bar under the front crank pulley and rock it up and down. An Allis C is about as valuable as the set of tires it rests on so I wasn't going to put much $$$$$ into it.
Once everything was apart I took the bare block/crank and placed on a piece of plywood with crank side up. Then used a 1/3 hp electric motor to spin the crank via the front crank pulley. Moving from one cap to another used a stone and emery paper to smooth the main journals. When all journal were smooth I removed the main bearings and cut brass shim backers (.005"?) to tighten the bearings. Then I played with the shims that go between block and bearing caps so the electric motor was comfortable spinning the crank. The crank and rods I did by hand fitting and shimming till they felt "nice".
I did replace the cam bearings and used a rebuild gasket set from this site. Still runnin' strong after a decade, burns a bit of oil but not too bad and no oil leaks like before. Old P/C showed all cyls at 120 psi.
It's hard for me to imagine the $$$ required for a proper machine shop rebuild on an old Allis. They are darn good little hunks of iron. But........
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