Author Topic: 1965 Bridgestone Sport 90 Engine Seized  (Read 9285 times)

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Offline mqtsteve

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Re: 1965 Bridgestone Sport 90 Engine Seized
« Reply #20 on: August 26, 2016, 06:28:00 AM »
Mike,
You will probably need to use a press.  I had the same problem.  Shop press made easy work of it.  The bearing may still be stuck on the crankshaft after being pressed out.  Use a puller to remove the bearing from shaft.  Good luck, Steve
Steve S.
4/1966 BS90 Sport(o.i.), 5/1966 BS90 Sport(o.i.),
1965 BS90 Trail, 1965 BS90 Mountain

Online OldSwartout

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Re: 1965 Bridgestone Sport 90 Engine Seized
« Reply #21 on: August 30, 2016, 08:58:13 AM »
You may be able to do it yourself without a press. I've done a few single cylinder engines this way. Block up the crankcase so there is room for the crankshaft to come out. Use wood or other material to avoid damaging the crankcase mating surface.  Use a hammer on the end of the crankshaft with a wood or aluminum block to prevent damage to the threads to drive the crankshaft out. For further protection of the crank threads, put the nut on it till it is almost flush before using the hammer and block.  If it doesn't move with reasonable blows, heat the crankcase around the bearing area with a propane torch until any oil begins to smoke a little (around 450 deg.). The heat may damage the seal, but it probably needs replacing anyway.  You'll need to heat the crankcase to get the new bearing in according to the service manual. Probably not as hot, though, as there won't be rust and varnish on the parts.

Steve is right, though. A shop press is preferred and makes quick work of it.
« Last Edit: August 30, 2016, 09:00:09 AM by OldSwartout »
Karl Swartout
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