Author Topic: Drive Side Outer Bearing Race  (Read 190 times)

Online Miker

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Drive Side Outer Bearing Race
« on: 23.08. 2020 05:46 »
Just got the engine cases split and have removed the inner bearing from the crankshaft with no problems. But I am unsure as to the method of removing the outer race from the drive side engine case. I don't want to damage anything so thought better to ask before attempting as I was unable to find an answer by searching the forum. 

Cheers Guys

Online KiwiGF

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Re: Drive Side Outer Bearing Race
« Reply #1 on: 23.08. 2020 06:38 »
Just got the engine cases split and have removed the inner bearing from the crankshaft with no problems. But I am unsure as to the method of removing the outer race from the drive side engine case. I don't want to damage anything so thought better to ask before attempting as I was unable to find an answer by searching the forum. 

Cheers Guys

You definitely need to heat the case up good and hot, if its got a rubber mainshaft seal that should be removed first, from memory you can just tap it out? Obviously the correct sized drift/tool would be best to tap it out and keep it straight.
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Online Miker

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Re: Drive Side Outer Bearing Race
« Reply #2 on: 23.08. 2020 07:34 »
It seems to have a shim/ oil flinger under the outer bearing race so I can't  get behind it to knock it out without damaging the shim. I have noticed two small holes in the cover under the race.  Would these be used for a small pin punch maybe?

Offline Swarfcut

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Re: Drive Side Outer Bearing Race
« Reply #3 on: 23.08. 2020 08:33 »
    Early engines have this circular oil slinger rather than the seal. The drive sleeve  originally had a scroll to keep the oil back, some engines have the slinger but a plain drive sleeve, a sort of halfway house. Early and later crankcase primary side castings are the same and early slinger versions may be machined to take a  seal. The slinger is dished, so make sure it is replaced the same way round.

 Get the case nice and hot and the race will come out with with just a little bit of a  tap. The two holes are over the outer race so heat up  the case 'til spit dances and use a punch. Replacement is hot cases, bearing race in the freezer, keep it square and it will push into place.

 Swarfy.

Online Miker

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Re: Drive Side Outer Bearing Race
« Reply #4 on: 23.08. 2020 09:24 »
Thanks mate, Much appreciated
 *smile*

Online BSA_54A10

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Re: Drive Side Outer Bearing Race
« Reply #5 on: 23.08. 2020 10:21 »
stick it on the BBQ bearing facing up
When it gets to around 200C the bearing will usually fall out all by itself
If not grab the cases with a pair of oven mitts and tap the case down on the plate a few time , that will cause difficult ones to fall out
Bike Beesa
Trevor

Online RDfella

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Re: Drive Side Outer Bearing Race
« Reply #6 on: 23.08. 2020 10:28 »
Be careful how hot you go. Don't want distortion or heat treatment abberations. I'd go for 150*C (Jaguar recommended temp for changing valve guides and valve seats in alloy heads). Treat 200 as absolute max. On of those cheap infrared thermometers is invaluable.
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Re: Drive Side Outer Bearing Race
« Reply #7 on: 24.08. 2020 03:29 »
Thanks everyone. Got the case around the bearing up to 100 degrees with a heat gun slight tap with a pin punch and it all fell out.
Its always good to ask for advice if not sure about something.   *smile*