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Pre unit gearbox numbers #120262
07/25/07 12:53 am
07/25/07 12:53 am
Joined: Mar 2007
Posts: 88
San Pedro CA
Lenos Offline OP
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Lenos  Offline OP
BritBike Forum member
Joined: Mar 2007
Posts: 88
San Pedro CA
What is the significance of the number stamped on the gearbox case on pre-units? For example I have a TR6 with the numbers 115506 stamped. Unfortunately this case has a crack so I need to repair or replace it. what numbers can I use or does it matter?

thanks all.


'64 Atlas/'60 TR6 Triton
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Re: Pre unit gearbox numbers #120263
07/25/07 1:04 am
07/25/07 1:04 am
Joined: Aug 2001
Posts: 6,738
Vermont
Jon W. Whitley Online content

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Jon W. Whitley  Online Content

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Joined: Aug 2001
Posts: 6,738
Vermont
You want to replace with like year cases. The factory dispatch records for a Triumph of that time would have included the engine,frame and transmission numbers. If it is an all original bike and the case is repairable then you might want to do that.But, you can use a case within the motorcycles manufactured time frame.

There are a few different variations of the the pre-unit cases...inner and outer.If your bike is a swing-arm model then the swing-arm model cases from 1954-1962 will work for you. The difference between a rigid case and a swing-arm case is easily identified. So, what year motorcycle is it?

beerchug


Jon W.


1957 6T Thunderbird 650
1968 T100R Daytona 500
1971 TR6R Tiger 650
1970 BSA A65F 650
1955 Tiger 100 - Project

Re: Pre unit gearbox numbers #120264
07/25/07 6:46 am
07/25/07 6:46 am
Joined: Mar 2007
Posts: 88
San Pedro CA
Lenos Offline OP
BritBike Forum member
Lenos  Offline OP
BritBike Forum member
Joined: Mar 2007
Posts: 88
San Pedro CA
The engine number is D2570 which makes it a 1960 I believe. The frame is long gone. I bought the engine and gearbox for use in a Triton so it's not such a big deal, but I do want to be period correct.

Thanks


'64 Atlas/'60 TR6 Triton

Moderated by  John Healy 


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