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Thread: well, the darn thing is out

  1. #1701
    Super Moderator LarrBeard's Avatar
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    There are all kinds of temperature gauges available. Some are just look-alike repro gauges that bear only a slight resemblance to what was actually in the M38A1’s. Early M38A1’s had the Douglas connectors on the gauges and electrical system. The Douglas connector gauges, as far as I have been able to find so far, were Ordinance gauges with part numbers like 7386865.

    About 1953 or so, someone put their foot down and the Mil-Spec (MS) standardization began to replace Army Ordinance, Navy NAVSHIP and BuAer and Air Force AF – parts with standardized parts for all of the military.

    In later M38A1’s, panel gauges went to Mil-Spec numbers. There might be different gauge styles 0-60 PSI vs. 0-120 PSI – but a Mil-Spec for each one.

    As for a temperature gauge, as I look at catalogs and pictures, the most common M38A1 gauge showing up is a gauge marked MS24543-2 (Indicator; Temperature, Electrical Resistance: 24 Volt DC, Range 120-240 degrees). Just for giggles the -2 gauge is “non-luminous”. The -1 gauge, which was been cancelled, was luminous – it had a radioactive adder to make it glow in the dark. Original R-390A radios had luminous gauges too – that’s why I glow in the dark now).

    Good ol’ MS24543 only tells you that the temperature gauge “Must operate linearly and accurately when properly connected in a circuit with associated transmitter MS24537”. At least we have a gauge/sender pair we can kind of depend on.

    Now, when I go to MS24537, there isn’t a lot of info there either. The spec gives three temperature/resistance points:

    Cold 120-degrees F 2360-ohms (+10%, -15%)

    Hot 200-Degrees F 710-ohms (+/- 5%)

    Too Hot 240-degrees F 310-ohms (_+/-8%)

    I’ve asked folks on this forum and the g503 to measure thee coils in the temperature and oil pressure gauges, but no luck so far.

    Just from an eyeball look at the resistances in the MS chart, at about 170 degrees engine temp, the resistance of the sensor should be considerably less that 2360-ohms and a bit more than 710-ohms. It looks pretty non-linear, but your 1.1K to 1.5K might not be too far off.

    What is the P/N on the face of your gauge? Is it still one of the original gauges or a repro/NOS unit?

    And, that instrument panel might not be ground after you did such a good job of getting off all the rust, priming it and putting a nice coat of paint on it. You did too good a job. Sometimes you have to skin off a bit of paint to get things to work.

  2. #1702
    Senior Member pelago's Avatar
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    frustrated..... got new fuel lines from kaiser. came in many sections one thing in common is that they all had 5/16 inverted flair ends all male, i drove 150 miles went to all auto parts store within 50 mile radius. nada.. went on internet and after 1/2 hour found them and ordered them
    https://www.mscdirect.com/product/de...rItem=62252408

  3. #1703
    Super Moderator LarrBeard's Avatar
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    That's the Jeep equivalent of "Batteries not Included".

    Like your local auto parts places, places around here tend not to have what I need and I get the answer "We can get that for you in a couple of days". Well, I've already wasted a morning running around looking for whatever I want and if I have them order it, I have to make another trip to the store to pick it up. Fuss and complain as I do about Amazon, at least things show up on my doorstep.

    You are overdue to post another picture of Jake - and the M38A1 as well.

  4. #1704
    Senior Member pelago's Avatar
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    Well, am diligently working on fuel lines.. Need elbows and unions to make it work and have to have them sent via internet, but found them. Two tires and rims on front now
    photos of jake coming got to get his *** to sit still though

    UNIONS AND 90 DEGREE PIECES CAN BE ALSO FOUND AT WWW.DISCOUNTHYDRAULICHOSE.COM

  5. #1705
    Senior Member pelago's Avatar
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    Jake just wond sit still unless
    14 weeks today
    8.jpgasleep

  6. #1706
    Super Moderator bmorgil's Avatar
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    Happy Birthday Jake!

  7. #1707
    Super Moderator LarrBeard's Avatar
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    14 Weeks Old

    Quote Originally Posted by pelago View Post
    Jake just wond sit still
    That baby is just Dog Tired. There is just too much to see and too many things to keep track of.

  8. #1708
    Super Moderator gmwillys's Avatar
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    Happy belated Birthday Jake!

  9. #1709
    Senior Member pelago's Avatar
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    Need bolt pattern FOR SPARE TIRE CARRIER to drill rear end of m38a1, no holes in tailgate?? Dont want to gorp it up

  10. #1710
    Super Moderator gmwillys's Avatar
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    I don't have the measurements, but I do know that the holes had inserts in them to prevent the body from collapsing. You can replicate the effect by over boring the hole through the stiffeners to the size of a section of pipe. The hardware was 3/8" if I remember correctly, so you need 3/8" i.d. pipe. When you put your flat washer on, you won't see the mod. I'll pull the pictures up in the morning to see if we can come up with reference points to get things pert near close.
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    Last edited by gmwillys; 08-10-2019 at 03:43 AM.

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