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Total Loss? #665654 08/29/16 6:31 pm
Joined: Jun 2007
Posts: 6,710
HawaiianTiger Offline OP
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I'm working on an old Triumph motor built for dirt track racing. It was made up from replacement cases and stamped with 0120, the same numbers that appear on the frame, which is a purpose made dirt track nickel plated frame of unknown manufacture(as of yet, anyway. Pics of that to follow later)

This whole bike was gifted to a local man while he was in Costa Rica.
Who could have guessed a dirt track Triumph would be living there? He also scored a '68 TR6, also in pieces.

I'm bugged by the fact that there are fine thread case screws in the timing side, and coarse thread screws in the primary. If that means what I think, then this really is a bastard motor. The primary side case has the multiple little Triumph stamps from the late sixties.

But, horrors upon horrors, this is what I found when I popped off the gearbox covers.

[Linked Image]

[Linked Image]

I've seen rust on gears and such before, but nothing this bad. In your opinion, is this gearbox a total write-off?

Quite frankly, I was lucky to get this apart without breaking anything.

Cheers,

Bill



Bikes
1974 Commando
1985 Honda Nighthawk 650
1957 Thunderbird/T110 "Black Tiger"
Antique Fans: Loads of Emersons (Two six wingers) plus gyros and orbiters.
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Re: Total Loss? [Re: HawaiianTiger] #665660 08/29/16 6:54 pm
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tiumphdave Offline
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Yep, total loss, in my experience. I've drug home several just like this.I just took a 500 unit apart that looked the same, I think it's from sitting outside and water runs down the clutch cable (I'm guessing). I've had primaries equally ruined.Sucks.

Re: Total Loss? [Re: HawaiianTiger] #665710 08/30/16 5:33 am
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Stuart Online Content
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Hi Bill,

Recent rust removal thread. Try one or more of the suggestions? Nothing to lose but a bit of time but maybe save the bits after all?

Hth.

Regards,

Re: Total Loss? [Re: HawaiianTiger] #665721 08/30/16 8:18 am
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ken sak Offline
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rust removed, pits in hardened parts seen, I've done that recently and
will use all the parts -it didn't look nearly as bad as that thou

Re: Total Loss? [Re: Stuart] #665722 08/30/16 8:30 am
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Jon W. Whitley Offline
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Yeah Bill,

Like Stuart said, try the rust removal. Throw the entire transmission and all rusty parts into a bucket filled with white distilled vinegar for a week or so. Take them out hose them off and disassemble and put them back in for another 3 or 4 days or a week and take them out, clean them off, neutralize the acid, then oil them up and take stock from there. You will be surprised at the outcome if you haven't done this before.


Jon W.


1957 6T Thunderbird 650
1968 T100R Daytona 500
1971 TR6R Tiger 650
1970 BSA A65F 650
1955 Tiger 100 - Project
1971 BSA A65 650 - Project
1972 Norton Commando 750 "Combat"

Re: Total Loss? [Re: Jon W. Whitley] #665733 08/30/16 10:37 am
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tiumphdave Offline
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I'm sure the rust can be removed in a variety of ways, I think the issue is the condition of the gears and shafts after de-rusting. Do badly pitted gear teeth still shift and work as they should? Seems they would wear rapidly. I know saving a questionable piece is part of the fun, but aren't transmissions around a hundred bucks or less?

Re: Total Loss? [Re: HawaiianTiger] #665771 08/30/16 2:52 pm
Joined: May 2007
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R Moulding Online Content
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Depends who I'm doing the job for. If it was my bike I would clean it all up, replace any broken bits and consumables then suck it and see. If I'm doing the job for a punter then the options need to be explained so they can make an educated choice that suits their pocket.

Rod


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Re: Total Loss? [Re: HawaiianTiger] #665774 08/30/16 2:58 pm
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HawaiianTiger Offline OP
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We're looking at complete gear clusters and shafts including shift forks for under 200$ right now.
I used to be able to source complete NOS gear clusters for 500$ and did quite a few pre unit boxes that way. It makes for a like-new gear box.

What I'm most concerned about is, like mentioned above, does it weaken the gear significantly, cause a lot of noise, or give problems with shifting? I'm not sure I want to take that chance and then have to rip it all apart all over again.

I have a reverse electrolysis kit in the garage. I use it on old rusty fan parts. Really saves on labor. I'll probably toss a gear or two in there just to see how bad they are.

Cheers,

Bill



Bikes
1974 Commando
1985 Honda Nighthawk 650
1957 Thunderbird/T110 "Black Tiger"
Antique Fans: Loads of Emersons (Two six wingers) plus gyros and orbiters.
Re: Total Loss? [Re: HawaiianTiger] #665782 08/30/16 3:26 pm
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leon bee Online Content
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I saved this one, it was hours and hours of work. Pressing gears off shafts, etc. Now I'm way too old to mess with one like you got there.

[Linked Image]


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