Author Topic: Oil lines  (Read 448 times)

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Offline cerullos1

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Oil lines
« on: October 07, 2020, 07:45:14 pm »
Does anyone know the size of the oil line  I belive 5/16.  And the tread is 1/4 NPT. For the fitting on the motor end or is it a British standard thread   shipping parts to Canada take a long time and expensive  for something easy to make thank you

Online ianinglis

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Re: Oil linesthe pi
« Reply #1 on: October 07, 2020, 08:24:56 pm »
the pipe itself is indeed 5/16 or 8mm diameter

the thread is 1/4" pipe thread (parallel) NPT / BSP

you will need a couple of copper or "DOWTY" washers where they enter the ally engine casing



IAN
BSA C10L 1956 - JFO 588
BSA C10L 1954 - MVE 107
RM6 RALEIGH RUNABOUT
ENFIELD DIESEL KUBOTA OC 95
BSA M21 RIGID RKN 816
CBF 1000
BSA ARIEL 3

Offline cerullos1

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Re: Oil lines
« Reply #2 on: October 07, 2020, 09:10:22 pm »
So NPT and BSP are the same no leakage at the fitting if  I use NPT     
Thank you for the help

Online ianinglis

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Re: Oil lines
« Reply #3 on: October 07, 2020, 09:33:17 pm »
NPT is actually an american taper pipe thread
the parallel version is NPS (S for straight) but its essentially the same as british standard pipe thread (BSP)
The tapered british version is BSPT

The thread angles are slightly different 55/60 degrees and the peaks and troughs are also slightly different flat/ rounded - but i wont tell anyone if you dont :-X



ian
BSA C10L 1956 - JFO 588
BSA C10L 1954 - MVE 107
RM6 RALEIGH RUNABOUT
ENFIELD DIESEL KUBOTA OC 95
BSA M21 RIGID RKN 816
CBF 1000
BSA ARIEL 3

Online Owen

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Re: Oil lines
« Reply #4 on: October 07, 2020, 09:42:06 pm »
You cant use 1/4" NPT or NPS as its 18TPI. You need BSP as its 19TPI.
1940 C12 (350cc)
1945 C10 & C11
1953 C10 & C11

Offline chaterlea25

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Re: Oil lines
« Reply #5 on: October 07, 2020, 09:43:20 pm »
Hi cerullos1
The advice about NPT is incorrect  >:(
1/4NPT is 18tpi
1/4BSP is 19tpi

The engine end fittings are unique to BSA, 1/4BSP to 3/8 BSF thread into the alloy crankcase

All you ever needed to know about threads is here, https://www.gewinde-normen.de/en/index.html

John

Online Tman

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Re: Oil lines
« Reply #6 on: October 08, 2020, 11:38:05 am »
And BSA didn't use taper threads for pipe fittings either.

Online ianinglis

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Re: Oil lines
« Reply #7 on: October 08, 2020, 05:15:10 pm »
OOPS SORRY - didnt check the tpi - i have been wrong on the odd occasion :-\



ian
BSA C10L 1956 - JFO 588
BSA C10L 1954 - MVE 107
RM6 RALEIGH RUNABOUT
ENFIELD DIESEL KUBOTA OC 95
BSA M21 RIGID RKN 816
CBF 1000
BSA ARIEL 3

Online Owen

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Re: Oil lines
« Reply #8 on: October 08, 2020, 06:01:20 pm »
Don't worry I'm wrong on more than the odd occasion  ;D
1940 C12 (350cc)
1945 C10 & C11
1953 C10 & C11

Online timsdad

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Re: Oil lines
« Reply #9 on: October 09, 2020, 08:30:06 am »
I thought I was wrong once, but I was wrong - I'd made a mistake and wasn't wrong.

Ray
Just a motorcyclist.

Online Cosmikdebriis

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Re: Oil lines
« Reply #10 on: October 09, 2020, 10:00:50 am »
Owen is never wrong but quite often he's wrpng ;D
A bike on the road... Is worth two in the shed...

Online Owen

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Re: Oil lines
« Reply #11 on: October 09, 2020, 12:24:54 pm »
 :P
1940 C12 (350cc)
1945 C10 & C11
1953 C10 & C11

Offline cerullos1

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Re: Oil lines
« Reply #12 on: October 10, 2020, 02:31:12 am »
Thank you. For the reply. I notice they were different then NPT. Make life more difficult

Online Owen

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Re: Oil lines
« Reply #13 on: October 10, 2020, 06:58:29 am »
I thought I had a couple spare and looked at postage.  For 200g small package postage starts at £25.00.  :o ouch.
1940 C12 (350cc)
1945 C10 & C11
1953 C10 & C11

Online Tman

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Re: Oil lines
« Reply #14 on: October 10, 2020, 08:47:41 am »
Royal Mail International to Canada, large letter up to 750g starts from £4.19. Obviously rises if signatures, insurance etc costs are added.