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Plunger Columns
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Topic: Plunger Columns (Read 515 times)
dsj666
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Join Date: Sep 2018
Posts: 21
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Plunger Columns
«
on:
26.09. 2018 19:02 »
Anybody know what is the thread size and type is in the end of a plunger column please?
The one where those aluminium caps on the top screw in.
Cheers
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1954 A10 Plunger (in bits)
Rex
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Join Date: Apr 2017
Posts: 1566
Karma: 7
Re: Plunger Columns
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Reply #1 on:
26.09. 2018 21:50 »
I can measure the TPI and major diameter tomorrow if you wish. Best send me a PM tomorrow afternoon as a reminder though...
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Rex
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Re: Plunger Columns
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Reply #2 on:
28.09. 2018 10:09 »
It comes out at 0.875" dia and 20 TPI. HTH.
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duTch
Ricketty Rocketty Golden Flashback
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Join Date: Oct 2011
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Re: Plunger Columns
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Reply #3 on:
28.09. 2018 11:07 »
I bought new SS ones from Lightning Spares and always figured they are BSC whatever size
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Started building in about 1977/8 a on average '52 A10 -built from bits 'n pieces never resto intended -maybe 'personalised'
Have a '74 850T Moto Guzzi since '92-best thing I ever bought doesn't need a kickstart 'cos it bump starts sooooooooo(mostly) easy
Australia
dsj666
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Re: Plunger Columns
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Reply #4 on:
28.09. 2018 11:16 »
Quote from: Rex on 28.09. 2018 10:09
It comes out at 0.875" dia and 20 TPI. HTH.
Thanks Rex...it would appear that's a 7/8 x 20 TPI BSC thread then, and taps seem to be available..!!
I was contemplating cleaning up the threads so they don't damage my new end plugs..!!
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1954 A10 Plunger (in bits)
Rex
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Posts: 1566
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Re: Plunger Columns
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Reply #5 on:
28.09. 2018 13:11 »
I recently bought two new stainless end caps and I had to spend ages lapping them in to fit the plunger column threads, just like I did with the stainless fork seal holders and stanchion top nuts too.
Close, but not close enough to fit perfectly.
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duTch
Ricketty Rocketty Golden Flashback
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Join Date: Oct 2011
Posts: 4528
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Re: Plunger Columns
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Reply #6 on:
28.09. 2018 17:56 »
I should add that I had a mate fabricate new columns from Chrome bar which entailed machining threads in to match, so probably also needed to tidy the plug threads.
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Started building in about 1977/8 a on average '52 A10 -built from bits 'n pieces never resto intended -maybe 'personalised'
Have a '74 850T Moto Guzzi since '92-best thing I ever bought doesn't need a kickstart 'cos it bump starts sooooooooo(mostly) easy
Australia
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The BSA A7-A10 Forum
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Technical (Descriptive Topic Titles - Stay on Topic)
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Frame
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Plunger Columns