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Author Topic: sump plate  (Read 853 times)

Offline Happy Hans

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sump plate
« on: 02.04. 2016 07:17 »
Hi gents,
I have a question about the sump plate studs from my 54 A10 engine. There are two different threads and I need to know if the stud at the crankcase side (1/4"x20tpi) is a BSW or a UNC thread. I need the info because I want to order the correct taps to renew the threads.

Thanks, Hans.
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Offline duTch

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Re: sump plate
« Reply #1 on: 02.04. 2016 07:57 »
 No UNF/UNC on A10's; Should be WW, now go wash your mouth out *eek*

 ( different angles, and except 1/2" Same pitch)
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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
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Offline Joolstacho

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Re: sump plate
« Reply #2 on: 02.04. 2016 08:37 »
Absolutely, none of this US UNC rubbish, it's Whitty or die!!!!
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Offline a10 gf

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Re: sump plate
« Reply #3 on: 02.04. 2016 10:08 »
1\4 BSW 20 tap here
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Offline WozzA

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Re: sump plate
« Reply #4 on: 02.04. 2016 10:26 »
If all else fails... use this guide..    *whistle*
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Re: sump plate
« Reply #5 on: 02.04. 2016 11:03 »
Studs
 31-0222      STUD      BSW/BSF      1/4"-20-26x7/8"      SUMP
Now I'm not sure it's right. I thought it should be BSW/CEI  Both are 26 tpi but CEI is 60 deg and BSF is 55 deg *dunno*
Cheers
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'51 A7 plunger, '57 A7SS racer now a A10CR, '78 XT500, '83 CB1100F, 88 HD FXST, 2000 CBR929RR ex Honda Australia Superbike .
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Offline Happy Hans

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Re: sump plate
« Reply #6 on: 02.04. 2016 14:42 »
Oh I think I stumbled in a bee nest downunder.
Thanks to a10gf for that input. I was not shure because of the different degrees which the threads have.
Now I will use BSW for the rest of my life.

Hans.
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Online RichardL

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Re: sump plate
« Reply #7 on: 02.04. 2016 15:28 »
Quote from: Joolstacho on 02.04. 2016 08:37
Absolutely, none of this US UNC rubbish, it's Whitty or die!!!!

...and we note that our venerable Whitworth is gauged in imperial dimensions, not that silly metric.  ;) *smile*

Richard L.
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Offline duTch

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Re: sump plate
« Reply #8 on: 02.04. 2016 15:49 »

 Same topic, but slightly off-thread (no pun intended *smile*), just while I think of it to save looking for the right topic/thread (*conf*), today whilst cleaning up a gearbox outer cover, I remembered that in addition to the clutch pushrod inspection cover screws being I guess BSC * citation needed, the screw that holds the kickstart spring is also BSC * citation needed.
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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

Offline BSA_54A10

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Re: sump plate
« Reply #9 on: 04.04. 2016 13:52 »
Now I think it was about 10 years ago the Stainless Fasteners did their compilation of BSA threads.
Any one of you who do not have a copy should hang your heads in shame, sell you BSa to some one who will really cherish and go ride the Bridgestone 100 you deserve.
http://stainlessbits.com/link12.html *bash*
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Bike Beesa
Trevor

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Re: sump plate
« Reply #10 on: 04.04. 2016 20:47 »
That's the page I got my info from Trevor. I use that page regularly.
"Bridgestone 100" I wish, my second bike was a Tas Tora 60.
Cheers
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'51 A7 plunger, '57 A7SS racer now a A10CR, '78 XT500, '83 CB1100F, 88 HD FXST, 2000 CBR929RR ex Honda Australia Superbike .
Australia
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