Author Topic: plunger gearbox case dimension  (Read 700 times)

Offline RDfella

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plunger gearbox case dimension
« on: 28.08. 2020 18:16 »
OK, here's an unusual one.
Plunger gearbox case. The face which mates against the engine has a selector camplate pivot protruding from it. Can anyone tell me whereabouts on that flange face it is? Might save me an engine strip. Roughly in the middle as I recall, but I'd like to be a tad more precise. Measurements preferably, although a photograph of the face in question would be helpful.

Thanks,

PS - how far the camplate / bolts protrude from flange face would also help.
'49 B31, '49 M21, '53 DOT, '58 Flash, '62 Flash special, '00 Firestorm, Weslake sprint bike.

Offline Greybeard

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Re: plunger gearbox case dimension
« Reply #1 on: 28.08. 2020 20:44 »
I found these pics online. Probably not much use to you. I hope someone has a box they can measure up for you.
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A Distinguished Gentleman Riding his 1955 Plunger Golden Flash

Offline morris

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Re: plunger gearbox case dimension
« Reply #2 on: 28.08. 2020 21:37 »
May this help?
The plate protrudes 1/4” and the bolts 5/16” above the mating edge.
If anymore questions don’t hesitate
'58 BSA A 10 SA
'52 BSA A 10 Plunger
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Offline Greybeard

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Re: plunger gearbox case dimension
« Reply #3 on: 28.08. 2020 23:04 »
I'm not sure you should be using a Japanese ruler to measure BSA parts.  ;)
Greybeard (Neil)
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Supporter of THE DISTINGUISHED GENTLEMAN'S RIDE https://www.gentlemansride.com

Warwickshire UK


A Distinguished Gentleman Riding his 1955 Plunger Golden Flash

Offline RDfella

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Re: plunger gearbox case dimension
« Reply #4 on: 29.08. 2020 20:10 »
Thanks guys, and those who pm'd me - exactly what I needed.
'49 B31, '49 M21, '53 DOT, '58 Flash, '62 Flash special, '00 Firestorm, Weslake sprint bike.

Offline Swarfcut

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Re: plunger gearbox case dimension
« Reply #5 on: 30.08. 2020 09:13 »
RD  A variation, two piece pivot mount. Boss face 11mm from mounting face, bolt heads lie lower.

 Swarfy