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Detroit Model G Oiler - Compression Fittings


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  #1  
Old 02-10-2019, 03:04:58 PM
Jeff Blaney Jeff Blaney is offline
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Default Detroit Model G Oiler - Compression Fittings

I need some input with regards to a Detroit Model G, five port lubricator I am rebuilding. I have run into some issues with the brass fittings and ferrules used and their compatibility with todays modern fittings.
I posted the question originally on the Oiler/Lubricator Board, but figured you good people might want to chime in.

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http://https://www.smokstak.com/forum/showthread.php?p=1552518#post1552518
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Old 02-10-2019, 07:30:33 PM
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Ed Noli Ed Noli is offline
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Default Re: Detroit Model G Oiler - Compression Fittings

Something like this may work. McMaster Carr lists others.

https://www.mcmaster.com/5272k604
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Old 02-11-2019, 08:39:34 AM
Bubbles Bubbles is offline
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Default Re: Detroit Model G Oiler - Compression Fittings

The one listed by Ed is a copy of a Swagelok 2pc ferrule.

I would make your own nuts and possibly your own ferrules if the Swagelok style ferrules won't work.
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Old 02-22-2019, 02:04:40 PM
Jeff Blaney Jeff Blaney is offline
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Default Re: Detroit Model G Oiler - Compression Fittings

Fabricating nuts from brass hex stock seems to be a straightforward solution, however I am finding it difficult to find the right size tap. These threads are 7/16-22. I have contacted our local tooling supplier, one in the U.S. that used to stock this size, as well as McMaster-Carr. Not one supplier seems to carry this size anymore. There is a 7/16-20 and a 24, but not a 22. A custom tap can be made, but they are $150 per piece....
Has anyone had any luck fabricating their own custom thread taps?
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Old 02-22-2019, 03:59:59 PM
Bubbles Bubbles is offline
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Default Re: Detroit Model G Oiler - Compression Fittings

I would cut them on the lathe with a single point tool to save buying a special tap $$$$$.
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Old 03-21-2019, 07:12:57 PM
Jeff Blaney Jeff Blaney is offline
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Default Re: Detroit Model G Oiler - Compression Fittings

After speaking with an early automobile collector who experienced the same issue I have, I decided to fabricate new banjo’s equipped with the modern 7/16-24 thread and ferrule profile. This was an inexpensive solution, looks damn near original and best of all, it works!
The new banjo’s have a slightly larger outer diameter than the originals so that the 1/8 NPT fittings have sufficient thread engagement. Our baby 1/4” boring bar came in handy fitting the new banjos to the original bolts. Once the fittings were threaded in and the excess removed, I bored the banjo out to its final diameter.

1. 3/4” Brass Round Stock and Original Banjo Fitting.
2. Cut to length and boring out round stock.
3. Drilling hole for 1/8 NPT fitting.
4. Plunging through excess thread.
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Old 03-21-2019, 07:18:24 PM
Jeff Blaney Jeff Blaney is offline
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Default Re: Detroit Model G Oiler - Compression Fittings

Here’s some pictures of the finished banjo fittings and how they appear on the lubricator, pumping away. Due to the larger O.D. of the banjo, I had to machine a small flat on the backside so the brass sight glass hood would fit properly.
I had considered other options to solve the problem of these original obsolete fittings, but this seemed the most practical.
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Old 03-22-2019, 11:19:01 PM
Brasherman Brasherman is offline
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Default Re: Detroit Model G Oiler - Compression Fittings

Looks like an excellent fix to repair an old oiler!
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