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bsa B31 bearings #584428
02/07/15 12:34 pm
02/07/15 12:34 pm
Joined: Oct 2013
Posts: 369
Essex England
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paul67 Offline OP
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does any one know if there is a difference in roller and ball bearings, I see the part I am looking at 24-0724 is listed with both
Paul

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Re: bsa B31 bearings [Re: paul67] #584432
02/07/15 12:52 pm
02/07/15 12:52 pm
Joined: Sep 2001
Posts: 2,798
Comox BC Canada
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Gordo in Comox Offline
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Comox BC Canada
The roller on the right side is 24-722, the roller on the drive side is 24-724 and the ball bearing on the drive side is 65-2045 in the 1953 parts book.

Gordo


Without frequent roadside repairs there is no fun in riding!
Re: bsa B31 bearings [Re: paul67] #584454
02/07/15 3:30 pm
02/07/15 3:30 pm
Joined: Oct 2013
Posts: 369
Essex England
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paul67 Offline OP
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Hi Gordo
what I meant was 24-724 has both roller and ball as the same part number, can you fit either

Re: bsa B31 bearings [Re: paul67] #584843
02/10/15 11:45 am
02/10/15 11:45 am
Joined: Aug 2001
Posts: 3,884
Cape Carteret, NC
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Mr Mike Offline
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Cape Carteret, NC
Originally Posted By paul67
does any one know if there is a difference in roller and ball bearings, I see the part I am looking at 24-0724 is listed with both
Paul


Not sure I completely understand your question as I am unfamiliar with the B31. There's a big difference between rollers and ball bearings. They can both have identical OD's, bores, and width, but their application depends on the design. For example a ball bearing is often used on one side of a crank to fix position and a roller on the other side which carries more load but also allows for differential expansion rates of the cases and the crank. Sometimes they will use two rollers (A series twins) and sometimes two rollers in combination with a ball (B50's). The BSA B50's do this and the purpose of the ball is to fix the crankshaft's position. Rarely do you see two ball bearings on opposite sides of a crank because of differential expansion rates.

Don't know if I answered your question.

Mr Mike

Re: bsa B31 bearings [Re: Mr Mike] #584865
02/10/15 2:13 pm
02/10/15 2:13 pm
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Posts: 344
Germany
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Pete C Offline
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Germany
Hi
Timing side is a roller, then on the drive side you have a roller next to the crank flywheel then a spacer and finally a ball bearing held in the case with a circlip. Both rollers are lipped and I would not replace wthem with either an unlipped roller or a ball bearing. One of the rollers (I can't remember which at the moment) is starting to get hard to find at a reasonable price but as you are probably only going to ever replace it the once I would not be tempted to try an alternative.

Cheers
Pete


Cheers
Pete
Re: bsa B31 bearings [Re: paul67] #584873
02/10/15 3:00 pm
02/10/15 3:00 pm
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Essex England
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paul67 Offline OP
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Essex England
what I was saying is that both roller and ball have the same part number 0724
I will opt for the roller
Paul

Re: bsa B31 bearings [Re: Pete C] #584874
02/10/15 3:01 pm
02/10/15 3:01 pm
Joined: Feb 2011
Posts: 3,501
Orygone
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Orygone
Originally Posted By Pete C
Hi
Timing side is a roller, then on the drive side you have a roller next to the crank flywheel then a spacer and finally a ball bearing held in the case with a circlip. Both rollers are lipped and I would not replace wthem with either an unlipped roller or a ball bearing. One of the rollers (I can't remember which at the moment) is starting to get hard to find at a reasonable price but as you are probably only going to ever replace it the once I would not be tempted to try an alternative.

Cheers
Pete



I'm mostly familiar with Gold Stars but all the drive side rollers I've used are the non-lipped MRJ 1 1/8". The timing side, MRJA 7/8", does have a lip. I've heard of the lipped, MRJA 1 1/8", being used on the drive side but I haven't tried this as this side is floating and end float is taken up by the compensating spring and lock nut. It would have to have a critical spacing configured to not foul the lip.


Bill B...


Boomer
Re: bsa B31 bearings [Re: paul67] #584886
02/10/15 4:09 pm
02/10/15 4:09 pm
Joined: Apr 2002
Posts: 962
North East England
beezageezauk Offline
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beezageezauk  Offline
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Joined: Apr 2002
Posts: 962
North East England
Originally Posted By paul67
what I was saying is that both roller and ball have the same part number 0724
I will opt for the roller
Paul


Paul,

The information that I have from the BSA "B" Group Replacement Parts Catalogue (GB31/33 engines)is the Roller bearing on the drive side is part number 24-724 and the Ball Bearing on the drive side is part number 65-2045.

Beezageezauk.

Re: bsa B31 bearings [Re: beezageezauk] #584975
02/11/15 5:12 am
02/11/15 5:12 am
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Posts: 344
Germany
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Pete C Offline
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Germany
I could be wrong about the drive side roller having a lipped outer race, I don't have one to hand at the moment.
Anyway, I thought the idea of the lipped race was that in case the outer race became loose in the casing it could not go so far inboard as to contact the flywheel, as the bearing rollers would prevent this. Pretty unlikely I suppose crazy

cheers
Pete


Cheers
Pete
Re: bsa B31 bearings [Re: paul67] #585018
02/11/15 2:01 pm
02/11/15 2:01 pm
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Posts: 369
Essex England
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paul67 Offline OP
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I know the part numbers but the bearings I found was ball type 724 and roller type 724
Paul

Re: bsa B31 bearings [Re: paul67] #585045
02/11/15 3:45 pm
02/11/15 3:45 pm
Joined: Apr 2002
Posts: 962
North East England
beezageezauk Offline
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beezageezauk  Offline
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Joined: Apr 2002
Posts: 962
North East England
Ok Paul,

We hear what you are saying. So where did you get your part number information from?

Beezageezauk.

Last edited by beezageezauk; 02/11/15 3:46 pm.
Re: bsa B31 bearings [Re: paul67] #585056
02/11/15 4:29 pm
02/11/15 4:29 pm
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Posts: 369
Essex England
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paul67 Offline OP
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Essex England
well that's it where did I get the part numbers for the ball and roller?
eBay add
paul

Re: bsa B31 bearings [Re: paul67] #585062
02/11/15 4:44 pm
02/11/15 4:44 pm
Joined: Dec 2004
Posts: 9,495
Scotland
kommando Offline
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Posts: 9,495
Scotland
Well you hopefully have learnt your lesson 'Never trust info on an eBay add'

And get a BSA parts book

Re: bsa B31 bearings [Re: paul67] #585074
02/11/15 5:42 pm
02/11/15 5:42 pm
Joined: Dec 2011
Posts: 291
Norfolk England
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DBDBrian Offline
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Posts: 291
Norfolk England
Hi Paul
BSA 65-045 SKF 6205 SINGLE ROW DEEP GROVE BALL BEARING 25 X 52 X 15 DRIVE SIDE
BSA 24-724 SKF 402454 CYLINDRICAL ROLLER BEARING 25 X 62 X 17 DRIVE SIDE
BSA 24-722 SKF Iā€“130748 CYLINDRICAL ROLLER BEARING 7/8" X 2-1/4ā€ X 11/16ā€ TIMING SIDE

HTH
Brian


Brian

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