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#580305 - 01/11/15 5:44 am BSA B25/Triumph T25 main bearings  
Joined: Nov 2001
Posts: 98
Jacco van D. Offline
BritBike Forum member
Jacco van D.  Offline
BritBike Forum member

Joined: Nov 2001
Posts: 98
Netherlands
Who can give advice about the internal clearance for the main bearings?

I just starting rebuilding a 1971 Triumph T25T engine.
Drive side has a Hoffmann roller, timing side a Nachi ball bearing.
The Hoffmann is marked with R325 V3 on the inner race and R325L V3 on the outer race

I allready have two new ball bearings for the timing side found in my box of new bearings. Both a SKF 6305 item. There is no clearance code on it. Only YH and on the other CH. I think these are production codes, but I am not sure.

I need to buy a new driveside roller. I bit googling found that C3 and normal clearance were used.

Now the questions:
1. I think I should use normal clearance on the timing side and C3 on the drive side. Am I right?
2. And because I still need to buy the roller: which type of manufacturer/cage should I use?

Thanks in advance, Jacco


Triumph T100T 1969
Triumph TR6R 1972
Triumph T25T 1971
BSA B25 Fleetstar 1968
Laverda 750SF 1971
TWN Boss 1954
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#580313 - 01/11/15 7:14 am Re: BSA B25/Triumph T25 main bearings [Re: Jacco van D.]  
Joined: Dec 2004
Posts: 8,896
kommando Online content
kommando  Online Content


Joined: Dec 2004
Posts: 8,896
Scotland
If there is no clearance code then assume its CN but I would be fitting a C3 as I have found the timing side seems to be a tighter fit in the housing than the driveside and have found some original fitted bearing with V4 on them ie modern C4 fit.

For the driveside I fit SKF C3 and use a nylon cage (I also fit a roller on the timing side and shim the crank to limit endfloat but that's my personal preference)

Details here

http://b50.org/phpBB2/viewtopic.php?f=60&t=3591

#580409 - 01/11/15 2:41 pm Re: BSA B25/Triumph T25 main bearings [Re: Jacco van D.]  
Joined: Nov 2001
Posts: 98
Jacco van D. Offline
BritBike Forum member
Jacco van D.  Offline
BritBike Forum member

Joined: Nov 2001
Posts: 98
Netherlands
Thanks Kommando.
Also thanks for the link.

I searched the whole afternoon for a NF305. Unfortunately SKF and FAG don't stock these. Not to mention the E and the C3 suffix.
That almost means I have to go for the original RHP R325 V3.
Not bad either I think, but postage from UK or USA is making it a lot more expensive.
Strange to buy a metric bearing from a place that is more familiar with inches.


Triumph T100T 1969
Triumph TR6R 1972
Triumph T25T 1971
BSA B25 Fleetstar 1968
Laverda 750SF 1971
TWN Boss 1954
#580412 - 01/11/15 2:57 pm Re: BSA B25/Triumph T25 main bearings [Re: Jacco van D.]  
Joined: Dec 2004
Posts: 8,896
kommando Online content
kommando  Online Content


Joined: Dec 2004
Posts: 8,896
Scotland
Go to your local bearing factors, these are the local offices for the bearing distributors and will be based on trading estates as their customers are the local factories, the maintenance depts need good supplies of bearings for repairing machinery. Just go in and quote the part numbers you need and if not in stock they can order and cheaper than online, ask them to give you a discount for a local company (I get 80%).


Moderated by  Allan Gill, Jon W. Whitley 


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