SOHC.co.uk Forums > CB350/400

Rear drum

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allankelly1:

--- Quote from: Nurse Julie on October 09, 2021, 04:20:30 PM ---You can get them re lined. Graham, Trigger, used to re line them for customers and our own bikes but doesn't do it now unfortunately. I'm not personally aware of anyone else that does it now but there must be someone in UK. There was a chap in Huddersfield, Terry I think, be he has retired.

--- End quote ---
Hi Julie

Looks at another thread and I see trigger used a donor brake drum from a motor factor for the repair and then bore out the old cast in ring then turn up a drum sleeve to suit the bored out sleeve and then shrink fit and finally then pin it in place and then do a final bore to ensure it was true

I also see that the brake drum diameter is about 160mm

Just thinking as I am a toolmaker with access to a lathe what donor drum please did trigger use and what was the interference fit etc he used?

Any info you or trigger can share regarding the repair would be most welcome so I can see what is involved should my search not turn up anything

Best wishes and thanks Al


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Bryanj:
The 400 drum does not crack up as often as the 500 so probably your cheapest/easiest answer is a used wheel from another 400. It was Paul in Huddersfiel, i had several 50's done  but as Julie said i believe he has retired.
If you remove the rim and spokes any decent machine shop should be able to machine it out and fit a liner IF they can find the cast iron to do it

Bryanj:
There should be a max dia measurement inside the drum

allankelly1:
Hi Bryan

Thanks for the reply

I think the PO had the bike standing for a long while  and looking at the drum internals maybe water has got between the drum and hub and started to rust as is a nice bulge on closed inspection?




But as winter is on the way me thinks that I should  repair the drum myself and not be a lazy bugger

Got no problem doing this as I am an ex toolmaker with the skills and access to a lathe etc

Also saw how trigger pinned the drum as extra security after

So I have asked trigger what donor drum he used so I can source a drum that is the correct sizes so I can then plan to bore out the old cracked sleeve and then turn up a new sleeve to replace the cracked one etc

Best wishes Al


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Bryanj:
That pic is exactly what the 500's do.

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