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main shaft tpi - 67 TR6 #798074 02/11/20 2:00 am
Joined: Sep 2018
Posts: 75
Walt Offline OP
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The kickstart ratchet nut ran off and left me since I disassembled the gearbox, so I bought a new one. The parts manual specifies an NT297 nut. Ordered one. It is a 9/16" x 20tpi nut. It only wants to go on a few threads then tightens up. So, I back the thing off before I make a ham fisted, expensive error. Inspect the threads, and they look fine. I clean the threads for good measure and try it again. Same thing. Finger spin it on a few threads very easy, then it goes tight pretty quick. Time to investigate. I remember reading somewhere on this forum that they may have changed to 18 tpi sometime in 1967. I'll look into it in more depth tomorrow. If Triumph did, indeed, change the threads on that shaft sometime in 1967 and didn't change the parts manual. What part number should I order to get the correct nut? I found a 21-0594 that might be correct, but I'm not certain.


Walt

1967 Triumph TR6R
2002 Aprilia Futura
2018 Royal Enfield Himalayan
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Re: main shaft tpi - 67 TR6 [Re: Walt] #798092 02/11/20 6:39 am
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triton thrasher Offline
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You’d find a thread gauge useful.

[Linked Image from ae01.alicdn.com]

Last edited by triton thrasher; 02/11/20 6:40 am.

Amateur Loctite enthusiast.
Re: main shaft tpi - 67 TR6 [Re: Walt] #798093 02/11/20 7:57 am
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kommando Offline
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Your bike is over 50 years old, a later unf mainshaft could have been fitted during the dark days when spares were sparse, as TT says get a thread gauge and take the guesswork out.

Re: main shaft tpi - 67 TR6 [Re: Walt] #798096 02/11/20 12:36 pm
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triton thrasher Offline
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An entire later cluster could have been fitted.

I’m told there were shafts with Unified (American) threads on one end and CEI (or BSF- I don’t know) on the other.


Amateur Loctite enthusiast.
Re: main shaft tpi - 67 TR6 [Re: Walt] #798102 02/11/20 1:51 pm
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Nick H Online Content
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I bought a mainshaft nuts for my BSA A65 (9/16 x 20) that was defective. I had to open up the chamfer and then it worked.
Actually bought 1 each from 2 sponsoring vendors with the same issue.
Mine is a different style nut than yours. Part number 57-1047

Last edited by Nick H; 02/11/20 1:54 pm.

1966 BSA Lightning
(2) 1967 Triumph "Choppa"s
1974 Indian ME125
Re: main shaft tpi - 67 TR6 [Re: Walt] #798107 02/11/20 3:53 pm
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Walt Offline OP
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I ordered a thread pitch gauge, and should be delivered by Friday. I haven't really needed one yet since I've been reusing nearly every original nut, bolt, and stud. Good tool to have though.

I have good reason to believe that the main shaft is original, but anything is possible.

I'll pick up a 9/16" x 18 nut on the way home, and very gently try to thread it onto the shaft just to see how it works while I wait for a thread pitch gauge.


Walt

1967 Triumph TR6R
2002 Aprilia Futura
2018 Royal Enfield Himalayan
Re: main shaft tpi - 67 TR6 [Re: Walt] #798108 02/11/20 4:00 pm
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Walt Offline OP
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I just caught my mistake. The parts manual lists S594 in the far right column for engines after DU48144. Mine in DU65838.

S594 is a 9/16" x 18tpi

I'll be ordering a new nut.

Thanks guys. Lesson learned.


Walt

1967 Triumph TR6R
2002 Aprilia Futura
2018 Royal Enfield Himalayan

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