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Engine Bearings Removal
January 19, 2013
7:08 pm

Hi All


I rebuilding the engine on my B175


I want to remove the 2 bearings on the crankshaft drive side.


In the BSA manual it states to warm up the crankcase to aid removal.


With both bearings close together can a member help me with the correct way to remove these 2 bearings.




January 19, 2013
7:39 pm
david dale
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Forum Posts: 2926
Member Since:
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.

January 20, 2013
1:25 am
The Artful Bodger
Club Member, 1764, Essex
Club Member
Forum Posts: 306
Member Since:
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, 1961 GPO D1, 1979 GS 850
January 20, 2013
12:55 pm
Club member 1473 Hampshire
Club Member
Forum Posts: 195
Member Since:
October 7, 2011

I bought a hot air paint stripper gun from Homebase and use it on max. Spit should bounce off the metal when it is hot enough.
All the best cool

Una, my Dad's original 1949 D1. Moto Guzzi 850-T3 Cali restoration project.
January 20, 2013
1:11 pm

I’ve just done mine….in the oven for 15 mins (when the Wife was away obviously)

January 20, 2013
2:07 pm
david dale
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Forum Posts: 2926
Member Since:
September 30, 2011

Should have told her it was chicken for dinner!

January 21, 2013
10:36 pm
Forum Member
Forum Posts: 227
Member Since:
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.

Cheers Sparky

January 22, 2013
1:14 am

I’m usually in enough trouble with the Mrs as it is. That’s why when I needed to do this I went round to my mother’s place. (She gets just as cross but these days her aim with the crockery is not quite as good as Alison’s.)

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