18-09-2020, 05:15 PM
Thanks all.
That's now done & was indeed MUCH less painful than Mr Woodrow led us to believe.
In case it helps others, here's what we did.
We used two lengths of 10mm brass rod, along with some wooden blocks to help hold them in place (one with two holes down by the bearing, and one with two notches wedged at the top)
(I have been cautioned that steel would be better - the race is hardened and won't be damaged and with brass you risk contaminating the bearing with flakes of brass, but I ony had the bits of brass)
A lump hammer then spread my gentle taps out to both drifts:
We also knocked up a rig to support the crank and let the bearing progress out:
We then dropped the crankcase in to a warm water bath (60 deg C) (we didn't have a fan heater to hand - a much better option) - yes we'll get everything warmed & dried after!:
We then dropped this on to the rig (thermal image):
and tapped away - the inner race moved nicely down the crank until the crank ran out of travel and impacted the crankcase.
Back in to the HOT water bath (up to 80 deg C), and on coming out of that, the front outer race pretty much fell out, and it was all gentle taps from there.
Probably overly complex, but it felt nice and controlled to me and didn't need any specialist tools (or use of the oven, from which I am banned!)
That's now done & was indeed MUCH less painful than Mr Woodrow led us to believe.
In case it helps others, here's what we did.
We used two lengths of 10mm brass rod, along with some wooden blocks to help hold them in place (one with two holes down by the bearing, and one with two notches wedged at the top)
(I have been cautioned that steel would be better - the race is hardened and won't be damaged and with brass you risk contaminating the bearing with flakes of brass, but I ony had the bits of brass)
A lump hammer then spread my gentle taps out to both drifts:
We also knocked up a rig to support the crank and let the bearing progress out:
We then dropped the crankcase in to a warm water bath (60 deg C) (we didn't have a fan heater to hand - a much better option) - yes we'll get everything warmed & dried after!:
We then dropped this on to the rig (thermal image):
and tapped away - the inner race moved nicely down the crank until the crank ran out of travel and impacted the crankcase.
Back in to the HOT water bath (up to 80 deg C), and on coming out of that, the front outer race pretty much fell out, and it was all gentle taps from there.
Probably overly complex, but it felt nice and controlled to me and didn't need any specialist tools (or use of the oven, from which I am banned!)