Chainsaw Repair
Chain - Grinders - Filing - Wood Milling - Tools - Welding - Machinist - Mowers - Tillers => Tool Shed => Topic started by: davbell22602 on October 26, 2013, 07:57:53 pm
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What are you guys using for removal and installation of the crank bearings instead of the 1118-893-7200? Old socket? Piece of wood?
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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.
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I use the freezer ,heat method also .Fact being it's the method Stihl recomends right in the service manuals .
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+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!
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I've put bearings in a awful lot of small engines over the years and I've done it all ways. But to force one with a interference fit often caused spots on the balls and races and the bearing job would turn bad.
I never had any trouble with the hot and cold method like Al is talking about. So simple and no fuss.
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So do you heat the cases to get the old ones out?
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Yes, warm them up and bump against a board and the bearing will fall out.
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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.
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Yes, warm them up and bump against a board and the bearing will fall out.
660, you have a Stihl avatar but you sound like you wee trained by the Husqvarna factory as was I!
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Model airplane engines - Including the Dolmars, Red Max's (Zenoah), & Echo's.
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A heat gun works great too .The main thing is don't force it don't beat on it like you are driving a railroad spike .If you chip the chrome from one of those balls in the bearing it will fail .
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Thanks for help