Author Topic: Dynamo bearings - what number are they? (and mag ones while I'm at it...)  (Read 1027 times)

Offline t20racerman

  • A's Best Friend
  • ***
  • Join Date: Feb 2011
  • Posts: 228
  • Karma: 7
  • Keep it nailed!
    • The T20 'Super Six' Suzuki website
Hi all

I went to clean up my dynamo as part of the rebuild process and found that the biggest of the two bearings is seized solid, and that the whole bearing spins nicely in the alloy casting where it is supposed to be a tight fit!
Also, the three small threaded holes in the alloy bearing holder - the ones that the cork seal holder bracket screws down to - are stripped.

So:
I need a new bearing - what number is it please?
Anyone got a better condition bearing holder casting that they fancy punting out?

Thanks
 
Good Advice
0
No reactions
1961 A10 - somewhat modified :-)
1980 TZ350 - lunatic Classic Race machine
1967 T20 Suzuki - heavily modified Classic Racer
1967 T20 Suzuki - pretty standard road bike
2007 KTM 660 SMC - fast and furious supermoto
Triumph 675 Speed triple
Ossa 250 and yet another T20 racer in bits both being built up

"If I had all the money back that I've spent on motorcycles... I'd spend it all on motorcycles!"

Offline trevinoz

  • Newcastle, N.S.W. Australia.
  • Wise & Enlightened
  • *
  • Join Date: Jul 2006
  • Posts: 2917
  • Karma: 67
Re: Dynamo bearings - what number are they?
« Reply #1 on: 13.06. 2011 22:15 »
Hi Racerman,
                       The drive end bearing is 6202 and the comm end 608. Use rubber sealed type and replace both.
I have plenty of end plates but am a long way from you.
The screws you refer to are 5BA which is close enough to 1/8".
Tap the holes to 5/32BSW or 4BA and it should be right. You may have to machine the diameter of the screw heads to fit but the cork gasket probably wouldn't care if you don't.
Loctite the drive end bearing into it's housing with a suitable grade.

  Trev.
Good Advice
0
No reactions

Offline t20racerman

  • A's Best Friend
  • ***
  • Join Date: Feb 2011
  • Posts: 228
  • Karma: 7
  • Keep it nailed!
    • The T20 'Super Six' Suzuki website
Re: Dynamo bearings - what number are they?
« Reply #2 on: 13.06. 2011 22:27 »
Hi Racerman,
                       The drive end bearing is 6202 and the comm end 608. Use rubber sealed type and replace both.
I have plenty of end plates but am a long way from you.
The screws you refer to are 5BA which is close enough to 1/8".
Tap the holes to 5/32BSW or 4BA and it should be right. You may have to machine the diameter of the screw heads to fit but the cork gasket probably wouldn't care if you don't.
Loctite the drive end bearing into it's housing with a suitable grade.

  Trev.

Thanks Trev. I'll order some bearings tomorrow. Good idea to get the RS sealed type too.
I'm sure I can make the end plate work if I can't pick up another from somewhere, so thanks for the thread info.

All the best
Adrian
Good Advice
0
No reactions
1961 A10 - somewhat modified :-)
1980 TZ350 - lunatic Classic Race machine
1967 T20 Suzuki - heavily modified Classic Racer
1967 T20 Suzuki - pretty standard road bike
2007 KTM 660 SMC - fast and furious supermoto
Triumph 675 Speed triple
Ossa 250 and yet another T20 racer in bits both being built up

"If I had all the money back that I've spent on motorcycles... I'd spend it all on motorcycles!"

Offline t20racerman

  • A's Best Friend
  • ***
  • Join Date: Feb 2011
  • Posts: 228
  • Karma: 7
  • Keep it nailed!
    • The T20 'Super Six' Suzuki website
Just modified this thread - I might as well get some mag bearings too while I'm at it  - what number are they?
As always, thanks for the help guys.  *smile*
Good Advice
0
No reactions
1961 A10 - somewhat modified :-)
1980 TZ350 - lunatic Classic Race machine
1967 T20 Suzuki - heavily modified Classic Racer
1967 T20 Suzuki - pretty standard road bike
2007 KTM 660 SMC - fast and furious supermoto
Triumph 675 Speed triple
Ossa 250 and yet another T20 racer in bits both being built up

"If I had all the money back that I've spent on motorcycles... I'd spend it all on motorcycles!"

Offline trevinoz

  • Newcastle, N.S.W. Australia.
  • Wise & Enlightened
  • *
  • Join Date: Jul 2006
  • Posts: 2917
  • Karma: 67
Racerman,
                   Depending on the age of your magy, the drive end is either E15 or E18. Slip ring end E15.
The number is the shaft diameter in mm.
I hope that you have a bearing puller.
  Trev.
Good Advice
0
No reactions

Offline fido

  • Zala County, Hungary
  • Resident Legend
  • *****
  • Join Date: Aug 2006
  • Posts: 684
  • Karma: 8
Remember you might have to shim up the endfloat on the mag if you fit new bearings.
Good Advice
0
No reactions

Offline wilko

  • Resident Legend
  • *****
  • Join Date: Mar 2010
  • Posts: 681
  • Karma: 4
And you'll need the special insulating cup washers. What a nightmare they are to fit. Be warned!
Good Advice
0
No reactions

Offline MG

  • Resident Legend
  • *****
  • Join Date: Dec 2009
  • Posts: 949
  • Karma: 23
Quote
And you'll need the special insulating cup washers. What a nightmare they are to fit. Be warned!

Coat the bottom and outside of the bearing race and one side of the star washer with a very thin layer of contact cement and press them together carefully, you got to get the bearing race centered over the hole in the washer properly!
Then bend up the ears of the washer and hold them in place with a strong rubber band, which will come off automatically as you press the bearing race home in the housing.
Heat the case before attempting to re-fit the bearing and use a drift of appropriate size!

Good luck, Markus
Good Advice
0
No reactions
1955 A7 Shooting Star
1956 A10 Golden Flash
1961 Matchless G12 CSR

www.histo-tech.at - Restoration, Repairs, Racing

Austria

Offline t20racerman

  • A's Best Friend
  • ***
  • Join Date: Feb 2011
  • Posts: 228
  • Karma: 7
  • Keep it nailed!
    • The T20 'Super Six' Suzuki website
Thanks for the mag info - yes, I'd forgotten about the fiddly insulating washer.  *sad2*

Perhaps a quick re-grease will do.. I hope so!
Good Advice
0
No reactions
1961 A10 - somewhat modified :-)
1980 TZ350 - lunatic Classic Race machine
1967 T20 Suzuki - heavily modified Classic Racer
1967 T20 Suzuki - pretty standard road bike
2007 KTM 660 SMC - fast and furious supermoto
Triumph 675 Speed triple
Ossa 250 and yet another T20 racer in bits both being built up

"If I had all the money back that I've spent on motorcycles... I'd spend it all on motorcycles!"