Author Topic: Cam bushing reamers  (Read 2462 times)

Offline dan daughenbaugh

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Cam bushing reamers
« on: 20.03. 2011 15:40 »
Hello All
Who makes a tool to ream the cam bushings, or are you guys using adjustable hand reamers for this?
50' BSA A7 Land speed racer
64' BSA A50C Scramble-ized
67' Triumph Bonnieville (stock)

Offline BSA_54A10

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Re: Cam bushing reamers
« Reply #1 on: 21.03. 2011 10:10 »
Adjustable reamers generally are just not good enough for this task. ( although I have done it with an adjustable )
Reamers are a standard tool from dozens of makers.
Engineering supply stores , bearing shops & some high end auto stores ( not chains ).
Which ones will depend upon where you live.
They are not cheap ( neither is not reaming properly ) which is why a lot of owners take their cases out to be done.
Bike Beesa
Trevor

Offline dan daughenbaugh

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Re: Cam bushing reamers
« Reply #2 on: 21.03. 2011 23:26 »
Adjustable reamers generally are just not good enough for this task. ( although I have done it with an adjustable )
Reamers are a standard tool from dozens of makers.
Engineering supply stores , bearing shops & some high end auto stores ( not chains ).
Which ones will depend upon where you live.
They are not cheap ( neither is not reaming properly ) which is why a lot of owners take their cases out to be done.
BSA 54 Im fully aware of what reamers are. I have a few that are made for other tasks. I was looking for something more specific like thishttp://www.britcycle.com/products/222296.htm but made for a7/10s. My bridgeport is down right now.
50' BSA A7 Land speed racer
64' BSA A50C Scramble-ized
67' Triumph Bonnieville (stock)

Offline BSA_54A10

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Re: Cam bushing reamers
« Reply #3 on: 22.03. 2011 09:39 »
errrrrh, that is what you are talking about.
Yes BSA did make on.
And no I have never seen one for sale.
Bike Beesa
Trevor

Offline 1660bob

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Re: Cam bushing reamers
« Reply #4 on: 22.03. 2011 10:33 »
The BSA tool for this job was a jig comprised of a plate with holes machined accurately that corresponded to the exact centres of the crank/idler/cam bushings,fitting over the crankcase dowels (part no.61-3281).It was bolted to the casings and provided a guide for the reamer (another BSA tool:61-3167) to do its job without losing the accuracy of the hole centres so as to maintain correct meshing/running clearence for the gears. Service sheet no.215 gives details .Finished bush dia is .7495"-.7485" according to BSA.I once saw one on US E-bay for sale, rare item ony likely to turn up when a dealership closes down, no idea if anyone makes aftermarket ones.Bob.

Online Brian

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Re: Cam bushing reamers
« Reply #5 on: 22.03. 2011 10:41 »
This is the tool, I've never seen one though.

Offline dan daughenbaugh

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Re: Cam bushing reamers
« Reply #6 on: 28.03. 2011 00:17 »
Found these http://www.maritool.com/product_info.php?products_id=4927. Looks like i will be indexing the cases on my bridgeport and using this reamer to size them. Not bad for $60
50' BSA A7 Land speed racer
64' BSA A50C Scramble-ized
67' Triumph Bonnieville (stock)

Online RichardL

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Re: Cam bushing reamers
« Reply #7 on: 28.03. 2011 05:12 »
"on my bridgeport"

BEAUTIFUL REAMERS, BUT THE ABOVE QUOTE IS WHAT STUCK WITH ME.
Plan on signing up for the world-wide 2020 DISTINGUISHED GENTLEMAN'S RIDEon September 27, 2020 (if it's not cancelled and we are free to move about by then). Watch website at https://www.gentlemansride.com for details.

Offline beezalex

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Re: Cam bushing reamers
« Reply #8 on: 29.03. 2011 19:14 »
I have to say I'm not a fan of reaming cam bearings or the TS bearing.  They don't leave a very good surface finish and alignment is typically not very good.  And, as previously noted, adjustable reamers don't work in this situation due to the blind bearing on the drive side.  I have now switched to honing and am very happy with the results.  Find someone with a honing machine and get it doe right.
Alex

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