Rotax 185 crankshaft installation into crankcases.

Here I am pushing in new oil seals, with a homemade 1" pvc tee and socket tool works good for removing also.

Now here's the fun part. The bearings are friction fitted to the crank, here is a way you can put the new ones on without a press, this works slick. 

Toss the crank in the deep freeze.  

Put the bearings in a small pot submerged in motor oil and heat till hot. 

When every thing is as hot and cold as its going to be whip the crank out of the freezer! 

Grab the bearings with pliers and slip them onto the cold shrunken ends IMPORTANT do not forget to replace all the shims and spacers in there correct positions

To re-assemble crankcase. Into the oven at 210'F goes the case halves and back into the freezer goes the crankshaft with new bearings wait (be patient) till they are up/down to temperatures

When ready whip the back crankcase half out of the oven and place on a block of wood, whip crank out of freezer and carefully and firmly press crank assy into rear case.

Make sure to put magneto end of crank into this side! 

POSITION case gasket then quickly remove front case from oven and place over crank and press down to bring halves together.
Notes  you must be gentle at first to make sure bearings align with there sockets in the cases to prevent jamming also check gasket placement.

Replace the 4 crankcase bolts and torque down to correct value, remember to use cross sequential incremental torquing .
At this time you will usually find a little resistance when the crank is turned over, This is normal.
Put the unit back into the oven to again  bring all parts up to uniform temperature, remove crankcase from oven then rap both ends of the case halves and bearing housings with a 2X4 block or wooden mallet, this will settle the bearings into there proper place. 

Recheck bolt torques when cooled