September 30, 2011
You simply get the cases good and hot, I use my Rothenburger butane torch, cases should be too hot to pick up, especially around bearings area, a longish thin round punch is used on the bearings inner race, the only part you can reach with any ease, you will of course damage the old bearings by hitting them this way, but new bearing sets are cheap enough about £25 a time on feebay. Don't just hit the inner race in one place, hit in at least 4 different places to get old bearing moving out in a controlled level fashion. DD.
November 26, 2011
I don't bother to use heat for removal, just for re-fitting. I turned a drift up on the lathe which goes through the centre of the inner bearing to knock out the outer. You could try to find something of a suitable size to do the same. Once the outer bearing is out you can get to the inner one.
1953 D1, 1955 Ariel Huntmaster, 1959 BSA M21, 1961 GPO D1, 1979 GS 850
October 7, 2011
September 30, 2011
February 29, 2012
Did mine with hot air paint stripper and old scewdriver outside one first then inside one working around the bearing a bit at a time. All as advised by forum they came out easy.
Putting in new bearings also heated up casings and greased and heated up grease and area but cooled bearings for a couple of days in freezer and gently knocked in bearings with drift on outer ring went in easy.
Did heating and cooling thing with seals also.
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