Gearbox rebuild
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Re: Gearbox rebuild
In support of the other posts suggesting DIY. I did a GB box quite some time ago when I knew even less than I do now. Only one error, which I refuse to elaborate on as it was purely down to frustration, time pressure and anger. This had no impact on the effective working of the 'box. I don't like it as much as the wrong for year AMC that I put back in. If I find time, though, the very hard used AMC will be coming out for a refurb and the Burman going back in. Just need to follow the threads on this Forum about using CP clutch with GB 'box.
Also reinforce the value of the smartphone camera, you really can't take too many pics.
Johnny B
Also reinforce the value of the smartphone camera, you really can't take too many pics.
Johnny B
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Re: Gearbox rebuild
Spot on||56G80S wrote:you really can't take too many pics.
Take photos at every stage of the disassembly - they will pay dividends
Regards Mick
- quizmaster
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Re: Gearbox rebuild
Forget the rebuild, once you have taken the photos instead help the poor quizmaster, who has nearly run out of ideas for the quiz after 6 years, by sending an image to quiz@jampot.comMick D wrote:Spot on||56G80S wrote:you really can't take too many pics.
Take photos at every stage of the disassembly - they will pay dividends
Regards Mick
"Hi-yo Silver and away"
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Re: Gearbox rebuild
Hi Mick
I use adjustable reamers and make very small adjustments each pass.
cheers
Bruce
I use adjustable reamers and make very small adjustments each pass.
cheers
Bruce
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Re: Gearbox rebuild
If you look in Christians Archive under 'Books'.......'Technical'........'Transmission'..........'Burman' you'll arrive here:
http://archives.jampot.dk/technical/Tra ... on/Burman/
where you'll find several helpful and illustrated CP rebuild articles including this one (link below) which although entitled 'Burman B52 Gearbox rebuild.pdf' it is actually for a CP 'box.....
http://archives.jampot.dk/technical/Tra ... ebuild.pdf
http://archives.jampot.dk/technical/Tra ... on/Burman/
where you'll find several helpful and illustrated CP rebuild articles including this one (link below) which although entitled 'Burman B52 Gearbox rebuild.pdf' it is actually for a CP 'box.....
http://archives.jampot.dk/technical/Tra ... ebuild.pdf
'There is a tide in the affairs of men
Which taken at the flood............'
Which taken at the flood............'
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Re: Gearbox rebuild
Mick, it was a while ago when I rebuilt my 'box. As I remember it, I made a shouldered drift from a suitable piece of bar and used a vice to press the bearings in. I used bushes from Jampot spares; they were an interference fit and loctite is unnecessary but they do close up slightly, hence the need to bore or ream. Reaming is as good a method as boring to size the bore, but if you are using a hand reamer, make sure it does not wander or go in slightly skewed. An alternative method, possibly slightly easier, is to mount the bushes on a mandrel in the lathe (3 jaw chuck is ok if you turn the mandrel to size in the chuck - push fit in bush) and finish the outside of the bush to a light push fit in the gear bore. Secure with loctite. This obviates the bush closing up and should leave it a nice running fit on the shaft - I used this method to fit swinging arm bushes as I did not have a piloted reamer. I find turning the exterior like this easier than clocking the gear true in a 4 jaw chuck and boring - it is usually easier to measure outside dimensions than inside ones. Hope this helps, Andy
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Re: Gearbox rebuild
Thanks Andy
Very useful information
I've done quite a bit of research on this subject now and have formed a cunning plan: Heat the sleeve gear and freeze the bushes, insert using a vice with the aid of a stepped mandrel and Loctite, try the main shaft for fit, (I've seen reports that a worn shaft, 0.859" in my case, needed no additional reaming), ream to size with an adjustable reamer, (I can set the sleeve gear up in my lathe and use a tail centre to keep the reamer aligned).
Fingers crossed
Regards Mick
Very useful information
I've done quite a bit of research on this subject now and have formed a cunning plan: Heat the sleeve gear and freeze the bushes, insert using a vice with the aid of a stepped mandrel and Loctite, try the main shaft for fit, (I've seen reports that a worn shaft, 0.859" in my case, needed no additional reaming), ream to size with an adjustable reamer, (I can set the sleeve gear up in my lathe and use a tail centre to keep the reamer aligned).
Fingers crossed
Regards Mick
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Re: Gearbox rebuild
Just about to start my CP box rebuild tonight . I don't need it running for 2 weeks to go down to the Talmag
What could possibly go wrong . its not unusual to be working late the night before
What could possibly go wrong . its not unusual to be working late the night before
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Re: Gearbox rebuild
What, again? You only did that 'box on your '46 last year...g80csp11 wrote:Just about to start my CP box rebuild tonight . ........ its not unusual to be working late the night before
You'll have it in the kitchen again I suppose now that you've finished the twin ?
At least you have some room in the kitchen .......
'There is a tide in the affairs of men
Which taken at the flood............'
Which taken at the flood............'
- spookefoote1956
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Re: Gearbox rebuild
Some of the tools in the photos are a mystery to me although I am most familiar with the wooden stick with the big metal bit on the end. From a health and safety point of view keep your thumb away from the metal bit and always wear a condom.
Hail Joe Lucas ............ Prince of Darkness!
All my bikes are original........ to me!
"Creativity is your intelligence having fun" Albert Einstein
All my bikes are original........ to me!
"Creativity is your intelligence having fun" Albert Einstein