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  #1  
Old 29-09-20, 00:55
Bruce Parker (RIP) Bruce Parker (RIP) is offline
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Default CMP GM Dash Oil Pressure thread size?

Does anybody know the thread size for an early GM commercial style dash oil pressure gauge? It doesn't appear to be pipe thread as used on Chev fuel pumps (just a bit smaller) and almost looks like it would take a compression fitting but won't. If it is a compression fitting it might just be my threads are a little damaged and I could retap...but only if that's what it is.

Any ideas?
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  #2  
Old 29-09-20, 02:22
Grant Bowker Grant Bowker is offline
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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.
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  #3  
Old 29-09-20, 03:12
Bruce Parker (RIP) Bruce Parker (RIP) is offline
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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!!
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  #4  
Old 29-09-20, 04:08
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Jordan Baker Jordan Baker is offline
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Not sure if this will help at all.
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  #5  
Old 29-09-20, 04:35
Bob Carriere Bob Carriere is offline
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Default I Bow to......

....to the Guru!!!!!
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  #6  
Old 29-09-20, 05:05
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Jordan Baker Jordan Baker is offline
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Any chance it’s an SEA fitting or JIC one?
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  #7  
Old 08-10-20, 01:20
Bruce Parker (RIP) Bruce Parker (RIP) is offline
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I got ten Weatherhead Eaton 6100X2 fittings today and they fit the back of the oil pressure gauge perfectly. Looking at the bevels on the male and female ends screwing in the fitting could operate as a compression fitting on the 1/8" tubing (or if not perhaps a flare may be required).

As to Rob's thought that the gauges for 216 and 270 engines may have different numbers and different pressures he may be right. The gauge I have marked for 30 pounds has the numbers 1506373 and 1506375 on it and the one in the Fox parts book is 1506377, presumably matching the 80 pound upper range painted on the instrument cluster glass. Looking at the 30 pound gauge guts I don't think there would be any damage if it was subjected to higher pressure. You just wouldn't know what the pressure was if it read over 30.
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  #8  
Old 08-10-20, 03:06
Colin Alford Colin Alford is offline
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Bruce,

I don’t have access to any Fox or Otter manuals but I do have access to C60X manuals.

When Rob posed the question of different pressures/gauges between the 216 and 270 engines, I had a look to see what I could find.

According to MB-C2 the early instrument cluster was graduated 0-15-30 for the 216 engine, and the oil pump was capable of producing 14 psi at 2000 rpm. Various Chev parts lists (Other than C60X) list the correct oil pressure gauge as 1506092.

According to M660-C1 the early instrument cluster was graduated 0-40-80 for the 270 engine, and the oil pump was capable of producing 35-40 psi at 1000 rpm. C60X-04 parts list shows oil pressure gauges 1506379 ( early with red pointer) and 1506377 (later with white pointer) which is also the same number you quoted from the Fox parts list.

If we disregard the 0 and 30 in the upper corners of your gauge, the part number seems to be much closer to the 0-80 gauges for the 270 engines than it is to the part number for the 216 engines.

Perhaps a test is in order to determine the actual range.

When the switch was made to individual gauges, both 216 and 279 engined vehicles used the same round gauge with part number 1506359. I presume the gauge had sufficient range to accommodate both types of engine.
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  #9  
Old 08-10-20, 03:35
Bruce Parker (RIP) Bruce Parker (RIP) is offline
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Thanks Colin, that's a ton of research and very helpful. You may be right about the Fox gauge given the number ranges. The cluster and gauge was in a NOS Fox dash and didn't looked messed with (for instance, the temp gauge was electric and had the instrument cluster been civilian or from a 216 Chev it would have been mechanical).

Quote:
Originally Posted by Colin Alford View Post
Bruce,

I don’t have access to any Fox or Otter manuals but I do have access to C60X manuals.

When Rob posed the question of different pressures/gauges between the 216 and 270 engines, I had a look to see what I could find.

According to MB-C2 the early instrument cluster was graduated 0-15-30 for the 216 engine, and the oil pump was capable of producing 14 psi at 2000 rpm. Various Chev parts lists (Other than C60X) list the correct oil pressure gauge as 1506092.

According to M660-C1 the early instrument cluster was graduated 0-40-80 for the 270 engine, and the oil pump was capable of producing 35-40 psi at 1000 rpm. C60X-04 parts list shows oil pressure gauges 1506379 ( early with red pointer) and 1506377 (later with white pointer) which is also the same number you quoted from the Fox parts list.

If we disregard the 0 and 30 in the upper corners of your gauge, the part number seems to be much closer to the 0-80 gauges for the 270 engines than it is to the part number for the 216 engines.

Perhaps a test is in order to determine the actual range.

When the switch was made to individual gauges, both 216 and 279 engined vehicles used the same round gauge with part number 1506359. I presume the gauge had sufficient range to accommodate both types of engine.
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  #10  
Old 08-10-20, 04:05
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Jordan Baker Jordan Baker is offline
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Here is the information for the Otter oil gauge.
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  #11  
Old 08-10-20, 04:16
Bruce Parker (RIP) Bruce Parker (RIP) is offline
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Quote:
Originally Posted by Jordan Baker View Post
Here is the information for the Otter oil gauge.
I bet the Otter and Fox gauge not only adjusted for pressure but allowed for a larger diameter line. Jordan, is the Otter line 3/16" or 1/4"?
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