Chainsaw Repair

I either use heat  on case with frozen bearing and socket if needed.  No heat way Art showed us here, socket and press in with vise.

Threads on subject somewhere. Try the search and see if you find anything.

+1 on the factory method. Some folks on another site do it completely wrong, by forcing the bearings onto the crank and then forcing the crank into the cases.......WRONG! Bearings are an interference fit into the case and crank should be pulled into the bearing by using factory tools.

Just a pet peeve of mine, factory would not waste time telling you exactly how to do it and making special tools if there was not a good reason to do it their way!

So do you heat the cases to get the old ones out?

The day before you want to put in new bearings, put them in the freezer. Next day remove all plastic rubber and chainsaw goop from the cases. Preheat your wife's oven to 150-200°C (do this when she is not home) otherwise you won't get any for a month! Put the cases in for 20-30mins. Get a block of wood and remove the case halves one-at-a-time from the oven and tap them on the wood, the bearings will drop out, so too will the seals. Put the case halves back in the oven, get your bearings out of the freezer, take one case half out of the oven, set the bearing in the case and tap it on the block to seat the bearing. Set aside to cool.

Model airplane engines - Including the Dolmars, Red Max's (Zenoah), & Echo's.