matt madden Wrote:
> thx! the chain wrench doesn't scuff the flywheel
> at all...a strap wrench wasn't cutting it for
> me...kept slipping...
> anyway, i've dropped the engine, replaced the
> engine mounts with the jd ones from treats,
> managed to get the vario off completely, i have a
> huge airleak on the cases so i'm replacing the
> crank bearings/seals, small end bearing, and vario
> this moby stuff is different but kinda fun just
> the same...
> after all this work is done i'm hoping that should
> just about cover everything...maybe...lol
Cool. My first rebuild was on my Moby, and I learned quite a bit. Important things to note when you're doing the bottom end: Heat is your friend. The bearings are held in the cases and on the crank with interference fit. Gently heating the cases surrounding the bearing can (with luck) allow your case to split without even thinking about using a hammer and risking crank issues.
Removing the bearings is (without using the special moby tool) best accomplished with a bearing splitter.
Temperature differential is the key to assembly. Freeze the crank, heat the bearings in an oven - if you do it right, they'll slide right on. Keep a pipe handy just in case they start to shrink too fast and need one last bit of help getting on. Any tapping down should be done with the crank supported by a steel plate in between the counterweights.
Oil up your case casket ahead of time, give the crank lots of time to settle to room temperature (I'm paranoid, so I give it at least a couple hours), then throw the whole thing into a ziploc bag and into the freezer.
Then you kind of do the same thing with heating the cases with the new gasket and seals.