Banjo bolt threads

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Chris Cole
Posts: 29
Joined: Tue Feb 21, 2006 1:41 pm
Location: Near Tewkesbury.

Banjo bolt threads

Post by Chris Cole »

David Morris and I have been using different solid and flexible oil pipe. This is the one that comes out of the rear timing cover and goes back in agin. This is held by two banjo bolts. My measurements make the bolt to be 5/8" diameter and 22 TPI. I cannot find this listed anywhere under any thread standard. Is it a special? If I wnated another bolt is it a case of making one? This is for interest only! I still have the two bolts.
Chris Cole from sunny (!) north Gloucestershire.
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ian Howell
Posts: 963
Joined: Thu Feb 09, 2006 10:46 am
Your interest in the forum: From 1962 to '63, CA Bradord LLG 125 (Repaired and used).
From 1966 to '67 Black deLuxe Javelin LDF 738 (Scrapped with broken chassis)
From 1967 to '87 Black de Luxe Javelin MKC 1 (later 6469TU). (Sold as non-runner with tons of spares, 1987)
From about 1980 to '87 ex WD Jowett stationary engine. (Sold on)
From 1966 to present, 1930 Long Four Fabric Saloon, Dark Blue / Black.
Taken in a part-repaired state to the 2010 Centenary Rally, returned to a roadworthy state by 2013.
Given Name: Ian
Location: Eastbourne, East Sussex, England
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Post by ian Howell »

Dunno. Have you checked BSP? I know BSB (British Standard Brass) is 26 tpi in all sizes - curious, but no help here.

Do let us (all) know when you find out.

Good luck!
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Leo Bolter
Posts: 367
Joined: Sat Feb 10, 2007 10:32 am
Your interest in the forum: Proud owner of:
1 x 1951 Jowett Jupiter
1 x 1952 LE Velocette
1 x 1952 Jowett Bradford
2 x 1982 Princess 2 litre
Location: R. D. 2, Palmerston North, 4472, New Zealand.

Re: Banjo bolt threads

Post by Leo Bolter »

Chris Cole wrote:My measurements make the bolt to be 5/8" diameter and 22 TPI. I cannot find this listed anywhere under any thread standard. Is it a special?
Chris, you too have probably done this exercise, but somewhere in the deep recesses of my old mind I had the idea that the threads used on the banjo bolts of our cars were a "standard" but obscure set up . . . so with this in mind I had a read of, and did a search for appropriate words in my digital version of "Machinery's Handbook" (one of the favourite references of engineers!). Lots of 5/8s and 22s turned up, but unfortunately not together . . . and NO reference is made to banjos!

I also referred to my ancient "Kemps Engineer's Year Book", using all imaginable criteria, but there was nothing pertaining to banjo bolts and/or their threads . . . So there you are, sounds like they are "special" !!

I also checked to see that they weren't metric!

But, one important fact that I can positivity contribute, is that there were 2 sizes of banjo bolts used in Javelin and Jupiter engines . . . one was 1/2" in diameter and 22 TPI (early cars) and the later one of 5/8", also 22 TPI.

I hope this post has bought a little more light on the subject (perhaps about 2.5 Watts worth?)

Cheers, Leo
R. Leo Bolter,
Palmerston North,
New Zealand.

JCC of NZ - Member No 0741.
JOAC - Member No 0161

Car: Jupiter (E1-SA-513-R)

Skype name = jupiter1951
Messenger name = r.l.bolter"at"massey.ac.nz
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