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Rating: 5
1953 rigid T100 gearbox #285360
11/23/09 9:21 am
11/23/09 9:21 am
Joined: Oct 2009
Posts: 226
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machico Offline OP
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I have a gearbox shell for late rigid model to use for my 1953 T100. I have a few sets of inner and outer cover But I can't figure out how to select the collect inner and outer covers for my 1953.

I looked up the parts number in the parts manual and figured out that I need T931 for inner and T935 for outer. So I checked the casting number of the covers I have right now. The casting numbers are all T411 for inner covers and T932 and T1219 for outer covers. I looked up T411, T932 and T1219 in the 50 to 57 parts manual but I can't find any of them in the manual. So I have no idea what year and what model they are for. Does anybody know? confused

Is the casting number different from the parts number in the parts manual? If so, how should I distinguish the year of the covers? confused

Thanks,
Macico

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Re: 1953 rigid T100 gearbox [Re: machico] #285362
11/23/09 11:01 am
11/23/09 11:01 am
Joined: May 2006
Posts: 509
melbourne, australia
7
76degree-triumph Offline
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76degree-triumph  Offline
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7
Joined: May 2006
Posts: 509
melbourne, australia
G'day. As far as I know the late (post 1950) rigid gearboxes used a lot of parts common with the swinging arm gearboxes. If the main gearbox case has 3 screw points (1/4 whit) running along the bottom of the casting then any pre unit middle/outer casting will fit. Some of the casting marks may not be matching but everything will still work. Dont get fussy with casting numbers.


1950 Speed Twin outfit
1951 Thunderbird outfit (76 degree racebike, or is it 90 deg now?)
1955 BSA D3 minibike outfit
Triumph solo's
Re: 1953 rigid T100 gearbox [Re: 76degree-triumph] #285368
11/23/09 12:14 pm
11/23/09 12:14 pm
Joined: Oct 2009
Posts: 226
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M
machico Offline OP
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76degree-triumph,

I imagined the same thing as what you said but I wasn't sure.
Thanks very much for the nice info!! smile

Thanks,
Macico

Re: 1953 rigid T100 gearbox [Re: machico] #285440
11/23/09 6:20 pm
11/23/09 6:20 pm
Joined: Oct 2003
Posts: 11,167
North Georgia, USA
RF Whatley Offline
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RF Whatley  Offline
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Posts: 11,167
North Georgia, USA
Mac -
Mr 76 is correct, the 2 outer covers were shared with later swing-arm models up to the introduction of the slick-shift. What will be most important for you will be matching the look of the oil fill hole. I believe there were several tiny changes. Also, one model may have anchored the clutch cable to the steel g/b adjuster and another had it cast into the inner cover... but maybe I've been staring at A10's too long.

The big thing is to NOT go by the cast-in part numbers. One number was used for the base casting or forging. And another number was used for the finished machined part. So 2 or 3 different finished parts could come from a single casting or forging. So you can get into trouble using the number you see on the part itself.

Hope this helps! bigt


Don't hide 'em, Ride 'em !!

RF Whatley
Cornelia, GA

"Shop Boy" at Rodi British Bikes
Re: 1953 rigid T100 gearbox [Re: machico] #285505
11/23/09 11:38 pm
11/23/09 11:38 pm
Joined: Aug 2001
Posts: 114
Ellisville, Ms.
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Allan Offline
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Allan  Offline
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Joined: Aug 2001
Posts: 114
Ellisville, Ms.
If I am not mistaken, the cast on bracket that anchors the clutch cable on the gearbox cover is straight up on the rigid model and leans out a few degrees on the swingarm models. Allan


member GABMA(Greater Atlanta British Motorcycle Association)
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Re: 1953 rigid T100 gearbox [Re: RF Whatley] #285521
11/24/09 12:41 am
11/24/09 12:41 am
Joined: Oct 2009
Posts: 226
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machico Offline OP
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machico  Offline OP
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Hi RF Whatley,

Thanks so much for your helpful advise!! smile
Now I am not afraid to use the parts for swing-arm models. grin

Thanks,
Macico

Re: 1953 rigid T100 gearbox [Re: Allan] #285523
11/24/09 12:58 am
11/24/09 12:58 am
Joined: Oct 2009
Posts: 226
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machico Offline OP
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machico  Offline OP
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Hi Allan,

I am surprised at your comment!! laugh
I checked my inner covers just now and found that your are correct! The one of my cover is surely straight up and the other one leans out a few degrees. I didn't know the differences!! laugh

Thanks so much for your nice advice!!

Thanks,
Macico

Re: 1953 rigid T100 gearbox [Re: machico] #285527
11/24/09 1:18 am
11/24/09 1:18 am
Joined: Sep 2001
Posts: 2,792
Comox BC Canada
G
Gordo in Comox Offline
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Gordo in Comox  Offline
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Joined: Sep 2001
Posts: 2,792
Comox BC Canada
Macico

Here are some shots of my 53 Speed Twin. It is a sprunghub but I think the gearbox is the same.











Gordo


Without frequent roadside repairs there is no fun in riding!
Re: 1953 rigid T100 gearbox [Re: Gordo in Comox] #285545
11/24/09 3:36 am
11/24/09 3:36 am
Joined: Oct 2009
Posts: 226
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machico Offline OP
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machico  Offline OP
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Gordo,

Thanks so much for the photos!! smile

Thanks,
Macico

Re: 1953 rigid T100 gearbox [Re: Allan] #285549
11/24/09 3:44 am
11/24/09 3:44 am
Joined: Oct 2009
Posts: 226
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machico Offline OP
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machico  Offline OP
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Joined: Oct 2009
Posts: 226
JAPAN
Originally Posted By: Allan
If I am not mistaken, the cast on bracket that anchors the clutch cable on the gearbox cover is straight up on the rigid model and leans out a few degrees on the swingarm models. Allan


Here are my covers. I found the casting number of 1958 on the left one. So the right one must be for rigid model.



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