Jim, you ask..."I want to know when you push the crank hard left by pushing on the pulley nut, what does the crank butt up against and how does one know that this is the proper position for the crank to run at?"-----There is a thrust surface on the L/H main bearing that wraps around the main bearing inner side & that rides on a thrust surface machined into the crankshaft. For thrust in the R/H direction the flywheel spacer rides on the outside of the R/H main bearing cover. There is no way of knowing exactly where the crankshaft is in relation to where it should be & more than likely it has moved to the left some over the years [that's probably that excess lateral play you have now]. One thing to look at is how far the crankshaft sticks out of the flywheel hub [after the end play is set] , if it is out very far that is probably the amount worn from the thrust surface of the L/H bearing thrust surface.
~As for the special wrench, those are floating around at the various tractor shows & are also available on line with a little searching. You can make one by heating & bending a 3/4" drive 2' extension or even by just welding 2 sockets side by side. You might try Ted Klee (517-663-6352), he sometimes has those flywheel wrenches for sale.
~On that oil leak….. That extra crankshaft lateral movement sure isn't helping an oil leak but probably isn't the main reason you have a leak. The most prevalent cause of an oil leak is a failed flywheel spacer inner seal ring [like an "O" ring] that goes between the flywheel spacer & crankshaft. The other dominant factor is too much L/H main bearing to crankshaft clearance causing more oil to be pumped into the L/H bearing cover area so there is more oil than the flywheel spacer can control. The other things that could be wrong are,,,, a plugged oil return hole in the bottom of the L/H spacer housing, or too much crankcase internal pressure due to combustion blow-by [if you have smoke coming from behind the clutch pulley you probably never will completely stop the oil leaking from behind the flywheel.~To set the crankshaft end play just loosen the 2 flywheel pinch bolts, then block [or have someone hold] the crankshaft over to the Left by pushing on the clutch center nut. [I usually jamb a piece of wood between the R/H tire & clutch center bolt] , then push [or drive with a block of wood] the flywheel on until it’s tight to the main bearing spacer & housing, then remove the R/H blocking, then use a piece of wood or brass drift & give the crankshaft in the center of the flywheel a good swat. That will drive the crankshaft back through the flywheel just a little. You can then use a dial indictor between the flywheel rim & engine block [.005”-.010”], or just grab the flywheel & move it by hand, you need a very light thunk with almost no movement [just a very slight movement] if it clunks you have too much movement. If it doesn’t move you don’t have enough…
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