Author Topic: Gear box gear shift selector forks  (Read 2510 times)

Offline a101960

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Gear box gear shift selector forks
« on: 03.07. 2017 10:57 »
Anyone know where I can get a10 gear shift selector forks (67-3204) from?

Offline Greybeard

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Re: Gear box gear shift selector forks
« Reply #1 on: 03.07. 2017 11:18 »
I just Googled 'BSA  67-3204' and got a few hits on Ebay
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Offline bsa-bill

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Online JulianS

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Re: Gear box gear shift selector forks
« Reply #3 on: 03.07. 2017 12:42 »
I have seen 2 different patterns of selector both marked with the number forging number 67 3118.

I have only seen one set as in the first photo and assume they are the early part 67 3118.

All the other ones seen over the years are as the second photo which I presume are the post 1950 part 67 3204.

Offline a101960

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Re: Gear box gear shift selector forks
« Reply #4 on: 03.07. 2017 13:00 »
Quote
I have seen 2 different patterns of selector both marked with the number forging number 67 3118.

I have only seen one set as in the first photo and assume they are the early part 67 3118.

All the other ones seen over the years are as the second photo which I presume are the post 1950 part 67 3204.
Yes, Julian they are not the same thing, not sure which way round, but one is wider than the other (the earlier plunger type I think) and so the gear set would need to be changed too.

Can't find 67-3204 on the Hawkshaw site, and Draganfly do not have them either
Quote
Sorry, but this part is not available. We can no longer supply this
I emailed Len Haggis a few days ago. I am awaiting a reply to my enquirey.

Offline RoyC

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My bike is a 1958 A7SS
Staffordshire UK

Offline a101960

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Re: Gear box gear shift selector forks
« Reply #6 on: 03.07. 2017 14:06 »
Quote
Is this one ?
Well, That might be it, but I want to avoid buying from the US if I can because of VAT and import duty. I also found one in Oz, but the same thing applies. A while back I bought a front brake drum via US ebay but by the time I had payed VAT and duty, it almost doubled the cost.

Offline chaterlea25

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Re: Gear box gear shift selector forks
« Reply #7 on: 03.07. 2017 16:46 »
Hi A101960,
I can supply a secondhand pair if you want them?

They are normally very robust and don't seem to wear out!!

John
1961 Super Rocket
1963 RGS (ongoing)

Online JulianS

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Re: Gear box gear shift selector forks
« Reply #8 on: 03.07. 2017 17:51 »
The early selector 67 3118 is show in the sketch from service sheet 209 from October 1948.

If you assemble a swinging arm layshaft D anf F gear with this selector it does not work there is no clearance between D and web on the selector.

3118 used until A7 engine ZA7 11191 and A10 engine ZA10 1214 when the box was modified.

So I think that the selectors in my lower photo in earlier post are 67 3204 which do clear because thay came from a swinging arm gearbox and are now working in the box on my swinging arm A10. Should be lots of them about being they were used for 13 years.

And I though I had a spare set of selectors!

Offline a101960

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Re: Gear box gear shift selector forks
« Reply #9 on: 03.07. 2017 19:59 »
This all part of the ongoing 1st/2nd  gear selection problem. Yesterday I did about 40 miles and twice 2nd would not engage when changing up from 1st to 2nd.  And as usual after reselecting  1st and then changing back up,  2nd engaged perfectly. The rest of the time the gearbox behaved perfectly normally. I have no real mechanical aptitude, or mechanical diagnostics ability for that matter either. Muskrat suggested that the problem was probably due to a worn or bent gearshift selector fork, and the Haynes book says pretty much the same. I no nothing about gearboxes, and I have no insight into how they work, but I am pretty well convinced that the gearshift selector fork is the source of the problem. The box has no other faults. It does not jump out of gear for example in any gear. 3rd and 4th are never any problem. So, this is why I am looking for gear shift selector forks, and here is the rub. John I would be interested in the used ones that you have, but I do not want to take everything apart only to find that the replacements are no better. Like I said I really do not know how to assess or compare the serviceability of these parts. It may be strikingly obvious when the old one comes out. For some reason there seems to be plenty of the early gear shift  selector forks about. All I know is that there is persistent, but intermittent problem, and it needs fixing. Bent would of course be obvious, but wear? How do you assess that? I don’t have a clue what to look for, that is why I was looking out for new ones, but I would be happy with used if they were serviceable.
John

Offline duTch

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Re: Gear box gear shift selector forks
« Reply #10 on: 03.07. 2017 20:19 »

 
Quote
The early selector 67 3118 is show in the sketch from service sheet 209 from October 1948.

If you assemble a swinging arm layshaft D anf F gear with this selector it does not work there is no clearance between D and web on the selector.

 I'd forgotten that I discovered this issue a few months ago, when I changed some gears in my Plungers' box; one of the gears (must be 'D') has narrower teeth to accommodate this gusset.
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Australia

Offline chaterlea25

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Re: Gear box gear shift selector forks
« Reply #11 on: 03.07. 2017 20:49 »
Hi John,
I have probably several sets of spares to choose the best from
Wear is immediately obvious in 99% of cases, any bend shows up as uneven wear (usually)
Before you go much further Have a look at the detent plunger, You can unscrew this from underneath the box
Check how many threads are showing below the locknut, before you remove it
the plunger should have an even pointed end and the spring should be undamaged
It might be worth unscrewing the plunger cap a turn and see if the change problem improves/disimproves ??

John
1961 Super Rocket
1963 RGS (ongoing)

Offline Rgs-Bill

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Re: Gear box gear shift selector forks
« Reply #12 on: 03.07. 2017 21:01 »
Hi John,
I have probably several sets of spares to choose the best from
Wear is immediately obvious in 99% of cases, any bend shows up as uneven wear (usually)
Before you go much further Have a look at the detent plunger, You can unscrew this from underneath the box
Check how many threads are showing below the locknut, before you remove it
the plunger should have an even pointed end and the spring should be undamaged
It might be worth unscrewing the plunger cap a turn and see if the change problem improves/disimproves ??

John

    Is disimproves even a word ? ? ? ?  I have made up a few of my own words on occasion, mostly when mad though, when something would not work or go together properly, ****    ****  ******   etc, etc,  *smile* ;)

      Is disimproves even a word ? ? ? ?
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Although getting a bit tougher to do ! !

Offline bsa-bill

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Re: Gear box gear shift selector forks
« Reply #13 on: 03.07. 2017 21:11 »
Disimprove definition: to become or make worse - Collins Dictionary

I'll lookout for you on Countdown
All the best - Bill
1961 Flash - stock, reliable, steady, fantastic for shopping
1959 Rocket Gold Flash - blinged and tarted up  would have seizure if taken to  Tesco

Offline Tomcat

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Re: Gear box gear shift selector forks
« Reply #14 on: 04.07. 2017 09:56 »
Hi John,
I have probably several sets of spares to choose the best from
Wear is immediately obvious in 99% of cases, any bend shows up as uneven wear (usually)
Before you go much further Have a look at the detent plunger, You can unscrew this from underneath the box
Check how many threads are showing below the locknut, before you remove it
the plunger should have an even pointed end and the spring should be undamaged
It might be worth unscrewing the plunger cap a turn and see if the change problem improves/disimproves ??

John



I was thinking that it could be the detent tension or lack of. Try screwing the cap in half a turn and re test before tearing it down.
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