Author Topic: drive side roller bearing  (Read 1207 times)

Offline edboy

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drive side roller bearing
« on: 04.05. 2016 22:36 »
hi a10 engine builders.
 i ve just bought a ngk japanese roller bearing for my engine rebuild. are they any good?
i have an old r and m lrj30, hoffman r130l v3 which look too old to replace. what do you think?
i intend to thrash this engine and wonder if was wiser to pay double for an old stock r and m or hoffman but the problem is that there are different types of r130l.
e.g. 40j 97p - what does that mean?
unfortunately all my local bsa dealers have retired or have passed away and precise information is not in my haynes manual.
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Online WozzA

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Re: drive side roller bearing
« Reply #1 on: 05.05. 2016 01:52 »
Dont know about NGK bearings...  *eek*  I took the advise of a couple of experts &
replaced mine with a NSK Nippon Seiko K.K Tokyo Japan # NF206W... 
No problems here..   *smiley4*
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Offline edboy

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Re: drive side roller bearing
« Reply #2 on: 05.05. 2016 19:21 »
thanks wozza, i ordered one today.
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Offline muskrat

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Re: drive side roller bearing
« Reply #3 on: 05.05. 2016 21:25 »
I know their very hard to find but a C3 clearance is recommended The bearing is (should be) tight on the shaft and housing (shrink fit). A standard CN bearing can get a little tight if it gets hot enough eg racing or extended high speed road riding in the Red Center.
Cheers
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Offline edboy

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Re: drive side roller bearing
« Reply #4 on: 05.05. 2016 23:27 »
i ve seen the triumph bearings advertised with c3 clearance but not the a10 ones. hence my question as to which bearing is best .
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Offline muskrat

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Re: drive side roller bearing
« Reply #5 on: 06.05. 2016 08:20 »
I've run a CN in the plunger for 20 years with no problems. She even made it onto the race track a few times.
Cheers
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Online Brian

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Re: drive side roller bearing
« Reply #6 on: 06.05. 2016 09:04 »
I have an original chart from the BSA drawing room and it lists all the bearings that fit all models and it doesnt state any specific bearing other than "normal" bearings.

I have always used CN or "normal" bearings in all my BSA's and have never had a problem.
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Offline muskrat

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Re: drive side roller bearing
« Reply #7 on: 06.05. 2016 09:25 »
Your probably right Brian. I just remember years ago (before the internet) being told by a race engine builder to use C3's for the drive side. As an apprentice F&T we had to work out which grade to use with different interference fits.
Cheers
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Online Brian

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Re: drive side roller bearing
« Reply #8 on: 06.05. 2016 09:54 »
Its hard to workout some of this stuff sometimes when there are no hard and fast rules or recommendations, its usually a give it a go and see what happens thing.

Its a bit like the drive side bearing that is meant to be a roller, I use ball bearings in mine and so far have not had a problem. The plunger A10 I had did 45,000 miles on the roller bearing in it and my current s/arm one has done 22,000 miles so far without a hitch and the bearing still feels like new. The reason I use a ball bearing is so I dont have any end float problems.
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Online RichardL

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Re: drive side roller bearing
« Reply #9 on: 06.05. 2016 13:12 »
I have an original chart from the BSA drawing room and it lists all the bearings that fit all models and it doesnt state any specific bearing other than "normal" bearings.

This chart is great. Thanks for sharing it. I think it's intereting that it's a hand-drawn drawing rather than a typed list.

Richard L.
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Offline KeithA

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Re: drive side roller bearing
« Reply #10 on: 13.05. 2016 16:18 »
Good information
Is there a part number for the ball bearing? and which motors would it fit. All A10's All A7's??
Thanks Keith
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Offline Peter in Aus

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Re: drive side roller bearing
« Reply #11 on: 09.10. 2016 08:23 »
Its hard to workout some of this stuff sometimes when there are no hard and fast rules or recommendations, its usually a give it a go and see what happens thing.

Its a bit like the drive side bearing that is meant to be a roller, I use ball bearings in mine and so far have not had a problem. The plunger A10 I had did 45,000 miles on the roller bearing in it and my current s/arm one has done 22,000 miles so far without a hitch and the bearing still feels like new. The reason I use a ball bearing is so I dont have any end float problems.
Brian that is interesting as when I did my A10 58 GF  I just replaced that bearing with what came out of it, a ball bearing which I got from the local bearing shop, not realizing  that it should have been a roller bearing.
I have been wondering whether I should replace it after reading some posts here but after reading your post I think I will just leave sleeping dogs lie *thanks*
However you must still set the end float to .0015 because it would loose to much oil pressure if you didn't, I assume you did that.
It would be interesting to hear other comments on the "for and agents" of using roller or ball bearings on the drive side *conf2*
Peter
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Online Billybream

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Re: drive side roller bearing
« Reply #12 on: 09.10. 2016 19:05 »
RichardL.
The bearing chart would have been an engineering drawing, it was more than likely ink on linen. The size of drawing would have been quite large too.
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