Chainsaw Repair

I use 300 degree F and put the seals in later after it cools down.

The bearings can be put on the crank with a socket that fits the inner race nicely and a little bit of persuasion without having to do much heating and freezing. I did a 390xp crank bearings like that. A couple taps and the bearings were on.

Some people put the bearings on the crank with the bearing being hotter than the crank. (Going to take a pretty deep socket or 3/4" drive otherwise?)

Then they heat the case halves and slide them over the room temperature bearings

The seals are not put in yet

There's more to this story . . . .

After applying the case bolts . . .

The crank is usually then hard to turn or tight in the case.  You then need to bump the crank back and forth with a dead blow hammer to loosen it up in the case.

Then the seals

The ways I had tried on 372.

One was putting case halves in oven to warm and using socket over bearing to push in.

2nd was socket over bearing and used my bench vise to press in each bearing into cases with no heat( Idea old iron logging told me to try)

I always had the crankshafts in the freezer before install about 24hrs.  Used center punch to help push through when needed. Then case bolts pulled together.

When using a socket to press or drive the bearings on the crank or in the case, do use have the socket on the inner or outer edge of the bearing?

Also, I know if I put the bearings in the case first I can bottom them out, but if I put them on the crank first, could I put them on to far, how do you know when to stop?