Author Topic: Sleeve gear conundrum  (Read 325 times)

Offline Slymo

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Sleeve gear conundrum
« on: 05.01. 2021 02:25 »
I’ve obtained a tidier sleeve gear for my STD SR gear box. I’m planning to polish the mainshaft with a stone and then re bush and match the ID of the new bush to the resurfaced shaft. I got a new bush with a 15/16” OD as per the book and from previous experience but on removing the old bush I discover the resultant hole is 29/32”. This is a surprise and I wonder if anyone has found this before?
NZ

Online KiwiGF

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Re: Sleeve gear conundrum
« Reply #1 on: 05.01. 2021 03:50 »
I’ve obtained a tidier sleeve gear for my STD SR gear box. I’m planning to polish the mainshaft with a stone and then re bush and match the ID of the new bush to the resurfaced shaft. I got a new bush with a 15/16” OD as per the book and from previous experience but on removing the old bush I discover the resultant hole is 29/32”. This is a surprise and I wonder if anyone has found this before?

Plenty of general info here https://www.a7a10.net/forum/index.php?topic=5202.0

I guess you are asking if your gear is modified or off another bike? Is it the same as the less tidy one?
New Zealand

1956 A10 Golden Flash (1st finished project)
1949 B31 rigid “400cc” (2nd finished project)
1968 B44 Victor Special (3rd project,in progress)
2001 GL1800 Goldwing, well, the wife likes it
2007 KTM 950 Adventure, cos it’s 100% nuts

Offline Slymo

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Re: Sleeve gear conundrum
« Reply #2 on: 05.01. 2021 06:48 »
Hi thanks for responding. I read that thread through but no mention of the bush OD only the size of the ID and main shaft. This sleeve gear looks absolutely identical to the others I have in my collection except that the bore without the bush rather than being 15/16ths (0.9375") is 29/32nds (0.90625") I can turn the bush down easily enough as I have plenty of wall thickness having got it with 7/8" ID in order to bore it to a nice close tolerance. What interests me is the wierdness of it as this sleeve appears to be a standard in everything from B31s onward.
NZ

Online KiwiGF

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Re: Sleeve gear conundrum
« Reply #3 on: 05.01. 2021 09:32 »
Could it be a timken bearing type sleeve gear? (I have no idea what those are like, but the needle roller boxes do have slightly different parts).
New Zealand

1956 A10 Golden Flash (1st finished project)
1949 B31 rigid “400cc” (2nd finished project)
1968 B44 Victor Special (3rd project,in progress)
2001 GL1800 Goldwing, well, the wife likes it
2007 KTM 950 Adventure, cos it’s 100% nuts

Offline Slymo

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Re: Sleeve gear conundrum
« Reply #4 on: 06.01. 2021 02:20 »
No whilst that would make sense it had a steel/bronze bush in it. Just a 32nd” smaller than the usual. Must have been a rouge week at the works. New bush turned down to fit now.
NZ

Online chaterlea25

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Re: Sleeve gear conundrum
« Reply #5 on: 06.01. 2021 11:33 »
Hi Slump,
Do not forget to put a relief in the middle of  the bush where the gap was between the 2 old bushes, it holds a drop of oil
I had a one piece bush sieze without the relief,
The bore in the needle roller sleeve gear is stepped so it's not that

John 
1961 Super Rocket
1963 RGS (ongoing)

Offline Slymo

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Re: Sleeve gear conundrum
« Reply #6 on: 09.01. 2021 21:19 »
Yes cheers I've machined a relief in the Centre of the Bush,  what I hadn't done that could have courted serious disaster was tighten the grub screw for the selector rod. I was riding back from visiting my very elderly mum and had a sudden and disturbing realization that the rod was basically floating. Got home to discover that it was poking out of the box just shy of clipping the final drive sprocket.  In order not to have to pull the whole primary side off again I lay underneath the bike with a 1/4" drive rachel with a 1/4" socket with a screw driver bit inserted that I turned by clicks with a 1/4" spanner having pushed the rod back home into the box with a big screw driver against the final drive sprocket.  Just when I begin to think I'm a competent mechanic 😨
NZ

Online BSA_54A10

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Re: Sleeve gear conundrum
« Reply #7 on: 10.01. 2021 08:44 »
unless you have owned both the bike & the sleeve gear from new there is no reason whatsoever to assume the gear has not been machined at some time in it's life.
Bike Beesa
Trevor