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A65 endfloat on a 1970 rebuild #724090
02/02/18 9:36 pm
02/02/18 9:36 pm
Joined: Feb 2002
Posts: 481
Stafford, UK
Andy Lorenz Offline OP
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Andy Lorenz  Offline OP
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Stafford, UK
BSA A65 Crank endfloat
Rebuilding a 1970 A65 lightning, replaced the drive side roller bearing as it had been standing for 40 years, used an RHP bearing.
On reassembly, the outer race was dropped in perfectly after placing the engine cases in an oven, the inner race did not want to slide onto the crankshaft, it preferred to be drifted lightly.

Also the primary drive front sprocket was a very tight fit. So I used a fine emery paper to lightly clean the crank so that the sprocket slid snugly. I also lightly cleaned the crank for the inner roller bearing.

When assembling to measure end-float, I found that the rollers were stiff when sliding into their outer race, the crank rotates smoothly.I also torqued up the rotor to 60 ft/lbs.

I cannot get any end float, the crank rotates smoothly.
I have removed ALL the shims and shim case, but there is still no end float. Is the rollers grabbing their outer race, preventing the crank from sliding?

Thoughts Gentlemen please.


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Re: A65 endfloat on a 1970 rebuild [Re: Andy Lorenz] #724092
02/02/18 10:04 pm
02/02/18 10:04 pm
Joined: Feb 2014
Posts: 971
Lancaster, California
C.B.S Online content

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C.B.S  Online Content

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Joined: Feb 2014
Posts: 971
Lancaster, California
What clearance roller bearing?

Re: A65 endfloat on a 1970 rebuild [Re: Andy Lorenz] #724093
02/02/18 10:13 pm
02/02/18 10:13 pm
Joined: Feb 2002
Posts: 481
Stafford, UK
Andy Lorenz Offline OP
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Andy Lorenz  Offline OP
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Stafford, UK
Don't know the clearance, it was supplied by Burton Bike Bits


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Re: A65 endfloat on a 1970 rebuild [Re: Andy Lorenz] #724097
02/02/18 11:03 pm
02/02/18 11:03 pm
Joined: Jan 2014
Posts: 3,515
Aus
N
NickL Online content
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Aus
The bearing fit is too tight if the inner does not go in by hand. The bearing is nipping up that's why you can't get any endfloat movement.

You didn't use loctite or any retainer did you? That can make the bearing too tight.
It may be an idea to remove the outer and check the case housing for round.
Failing that, use a c3 fit bearing.



Re: A65 endfloat on a 1970 rebuild [Re: Andy Lorenz] #724162
02/03/18 6:55 pm
02/03/18 6:55 pm
Joined: Feb 2002
Posts: 481
Stafford, UK
Andy Lorenz Offline OP
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The bearing is an RHP MRJA1.1/8JC2


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Re: A65 endfloat on a 1970 rebuild [Re: Andy Lorenz] #724166
02/03/18 8:08 pm
02/03/18 8:08 pm
Joined: Feb 2014
Posts: 971
Lancaster, California
C.B.S Online content

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Originally Posted by Andy Lorenz
The bearing is an RHP MRJA1.1/8JC2




Should be a CN

Re: A65 endfloat on a 1970 rebuild [Re: C.B.S] #724170
02/03/18 8:53 pm
02/03/18 8:53 pm
Joined: Oct 2001
Posts: 1,106
Sydney, Oz
S
Shane in Oz Online content
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Sydney, Oz
Originally Posted by C.B.S
Originally Posted by Andy Lorenz
The bearing is an RHP MRJA1.1/8JC2




Should be a CN

Should it be CN or C3? A lot of the other BSA engine/gearbox bearings are C3.

SKF has a summary of the clearance markings here

Re: A65 endfloat on a 1970 rebuild [Re: Andy Lorenz] #724185
02/03/18 10:43 pm
02/03/18 10:43 pm
Joined: Jan 2014
Posts: 3,515
Aus
N
NickL Online content
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Aus
As far as i know, BSA never specified a C2 on the A65, so it's incorrect anyway.
The CN is standard fitting i think.
If it's very tight as it is, i would use a C3. I have seen both types fitted on rebuilds i've done.
A little noise is better than a tight bearing.



Re: A65 endfloat on a 1970 rebuild [Re: Andy Lorenz] #724187
02/03/18 11:00 pm
02/03/18 11:00 pm
Joined: Feb 2002
Posts: 481
Stafford, UK
Andy Lorenz Offline OP
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I will ring Burton Bike Bits on Monday as they supplied the bearing.


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Re: A65 endfloat on a 1970 rebuild [Re: Andy Lorenz] #724237
02/04/18 11:51 am
02/04/18 11:51 am
Joined: Feb 2002
Posts: 481
Stafford, UK
Andy Lorenz Offline OP
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Andy Lorenz  Offline OP
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Stafford, UK
Just had a thought, have I installed the inner back to front, does it make a difference ?
I have the writing on the inner face facing the crankshaft centre.


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Re: A65 endfloat on a 1970 rebuild [Re: Andy Lorenz] #724256
02/04/18 4:37 pm
02/04/18 4:37 pm
Joined: Dec 2004
Posts: 9,145
Scotland
kommando Online content
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No, it is good practise to have the writing facing outwards only so on the next disassembly the new owner knows what bearing is in there before taking the bearing out but has no effect on how it operates. C2 is too tight for a bearing in an alloy housing with the correct inference fit, BSA have always been C3 on any engine I have dismantled, only on Triumphs and Nortons have I found CN and never C2.

Re: A65 endfloat on a 1970 rebuild [Re: kommando] #724282
02/04/18 8:05 pm
02/04/18 8:05 pm
Joined: Feb 2014
Posts: 971
Lancaster, California
C.B.S Online content

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Lancaster, California
Originally Posted by kommando
No, it is good practise to have the writing facing outwards only so on the next disassembly the new owner knows what bearing is in there before taking the bearing out but has no effect on how it operates. C2 is too tight for a bearing in an alloy housing with the correct inference fit, BSA have always been C3 on any engine I have dismantled, only on Triumphs and Nortons have I found CN and never C2.




I have a box full of roller bearings from A65's and all are CN but have the stamping V3 (Hoffmann). V3 is the vibration rating and not the clearance rating. I have yet to find a C3 roller bearing out of an A65.

I do agree that most BSA models did use C3 ball bearings.

I would try a CN bearing or perhaps a C3.

Re: A65 endfloat on a 1970 rebuild [Re: Andy Lorenz] #724812
02/08/18 10:06 pm
02/08/18 10:06 pm
Joined: Feb 2002
Posts: 481
Stafford, UK
Andy Lorenz Offline OP
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Posts: 481
Stafford, UK
Update: Spoke to Burton Bike Bits, and they confirmed that the correct bearing should have been a CN not a C2.
They are going to update their web page catalogue, and said that the wrong bearing had been placed onto their parts shelf.
They are going to refund the bearing. However, they cannot supply a CN bearing so SRM are offering a NKE main version which is a CN version.


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Re: A65 endfloat on a 1970 rebuild [Re: Andy Lorenz] #724825
02/08/18 11:39 pm
02/08/18 11:39 pm
Joined: Feb 2014
Posts: 971
Lancaster, California
C.B.S Online content

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C.B.S  Online Content

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Lancaster, California
Originally Posted by Andy Lorenz
Update: Spoke to Burton Bike Bits, and they confirmed that the correct bearing should have been a CN not a C2.
They are going to update their web page catalogue, and said that the wrong bearing had been placed onto their parts shelf.
They are going to refund the bearing. However, they cannot supply a CN bearing so SRM are offering a NKE main version which is a CN version.



You can always give us a try! I have SKF (England) Cheers

Re: A65 endfloat on a 1970 rebuild [Re: Andy Lorenz] #724842
02/09/18 3:14 am
02/09/18 3:14 am
Joined: Aug 2001
Posts: 3,641
argyll. scotland, uk
gavin eisler Online content
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