Author Topic: Gear box cam plate  (Read 363 times)

Offline Superflash

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Gear box cam plate
« on: 20.06. 2021 00:40 »
Gents. Just wondering if I need to have a spacer behind the cam plate? Have been trying to figure out why it keeps jumping out of neutral and noticed there's a 2-3mm gap behind the cam plate and gear box shell. So if its moving towards the shell it will disengage from the plunger.... nothing in the parts list or service sheet about needing a spacer. Cheers in advance
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Offline Colsbeeza

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Re: Gear box cam plate
« Reply #1 on: 21.06. 2021 04:21 »
Does it not have a pivot pin to sit on, which is mounted from outside the case.?
Col
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Offline Peter in Aus

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Re: Gear box cam plate
« Reply #2 on: 22.06. 2021 01:26 »
Gents. Just wondering if I need to have a spacer behind the cam plate? Have been trying to figure out why it keeps jumping out of neutral and noticed there's a 2-3mm gap behind the cam plate and gear box shell. So if its moving towards the shell it will disengage from the plunger.... nothing in the parts list or service sheet about needing a spacer. Cheers in advance

Maybe some photos of the cam plate and where it sits might help, from memory there is no spacer there.
Peter

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Online orabanda

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Re: Gear box cam plate
« Reply #3 on: 22.06. 2021 03:03 »
The axial movement of the camplate should be limited by the selector forks which bear flat against the camplate.
The selector forks' position is determined by the shaft they slide along.

Suggest you install camplate and both selector forks (on their shaft).

Also insert detent plunger.

Leave the middle casing (bearing carrier) off and check end float.

Richard

Online chaterlea25

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Re: Gear box cam plate
« Reply #4 on: 22.06. 2021 18:33 »
Hi Superflash
What type of gearbox are you asking about? The camplate  is different on plunger gearboxes as is the mounting for it

John
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Offline Superflash

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Re: Gear box cam plate
« Reply #5 on: 23.06. 2021 05:24 »
Gents. So I've pulled the innards of the gearbox out, and discovered that the pivot pin has a shoulder that corresponds to another shoulder inside the cam plate.

I guess this is what stops the cam plate from wandering off the plunger tip?

Cheers



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Offline Swarfcut

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Re: Gear box cam plate
« Reply #6 on: 23.06. 2021 08:34 »
 SF.  That sounds a bit strange. All my plunger camplates are plain, flat faced towards the pivot shoulder. The camplate should end up positioned centrally over the plunger tip, free to turn and with no axial play. From the description there is a counterbore on the camplate,  that shouldn't be there. As suggested by Orabanda, all easy to assemble and check.
 Reading through your earlier posts this gearbox has had a few assembly issues from an earlier time, so take nothing as being correct.

 S/A Camplate has teeth to match selector quadrant. Plunger type has distinct lugs  which engage in the selector arm claw so no mistaking the correct one for the box. Plenty of internet images to compare with what you have.

 Swarfy.

Offline Superflash

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Re: Gear box cam plate
« Reply #7 on: 23.06. 2021 20:29 »
You're probably right. The whole thing has been butchered at some point in it's life. I ended up getting a new kick start quadrant as shaft on the old one had been dealt to with an angle grinder. And the dramas continue. Taking the whole lump out is looking more likely.
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Offline Superflash

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Re: Gear box cam plate
« Reply #8 on: 29.06. 2021 04:17 »
Seems bit of a pity I have to pull the whole thing apart again just to get the gearbox out... still practice makes perfect I guess.

I think there is ample evidence of skullduggery to justify it though. To be honest, the gearbox is the weak link in the whole build as I haven't done too much to it compared to the motor what with new this, that and everything in between. So will replace all bushes and bearings. Already got new kickstart quadrant and ratchet, cam-plate, layshaft, thrust washers and drive sprocket. The gear clusters looked alright, so will leave them alone.
68 Trophy
74 Trident
74 XLCH Sportster x 2
86 Liberty Sportster
07 FXDWG (current)
53 BSA SF (WIP)