CMP GM Dash Oil Pressure thread size?

Grant Bowker · #1 29-09-20, 02:22

Looking at gauges I have and by parallel to other parts of the engine oiling system, not from any sure knowledge, my guess is that it would be a Weatherhead fitting. See attached photos of gauge and fitting. Bob Carriere was speaking with someone (from the Kingston area?) who claimed they were available from Motion Industries Canada (in Ottawa) but that you had to buy a bag of 10 to get them. Motion also has a branch in London.
Notes: This is a 2 part compression fitting (tapered nut that fits on the line and matching socket in the gauge. (There were also fittings made with the weatherhead socket and a 1/8 pipe thread that were used on the engine block (for pressure gauge and in different size for the oil filter lines)) Weatherhead has developed into a sub-brand of Eaton for many types of fittings - no longer just the type seen here.

Bruce Parker (RIP) · #2 29-09-20, 03:12

Grant, you are amazing. It appears to be a Weatherhead (Eaton) 6100X2 for 1/8" tube and 5/16-24 threads. Motion Industries lists them at $0.87 each so even if I have to splurge and get a bag of 10 I'm good. The London location might be a 5 minute drive from my office!!

Jordan Baker · #3 29-09-20, 04:08

Not sure if this will help at all.

Bob Carriere · #4 29-09-20, 04:35

....to the Guru!!!!!

Jordan Baker · #5 29-09-20, 05:05

Any chance it’s an SEA fitting or JIC one?

Bruce Parker (RIP) · #6 29-09-20, 14:40

Quote:

Originally Posted by Jordan Baker

Any chance it’s an SEA fitting or JIC one?

Last night going with the Weatherhead tip I found a Chev restorer's website that confirms the 6100X2. It also talks about the original line being 1/8" steel but that can safely be replaced with 1/8" copper that is much easier to find today. My remaining question is whether 1/8" (primed) will carry the pressure from the engine to the gauge over ~10' or if I should step it up to 3/16" or even 1/4" tube.

rob love · #7 29-09-20, 16:09

The rule in hydraulics is that pressure is equal and undiminished in all directions. If it were a matter of flow, sure go bigger. But pressure...as long as it is not pinched closed 1/8 should work.

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