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EFV-8 Club Forum / General Ford Discussion / 1939 temperature sending unit...repost

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Discussion Topic: 1939 temperature sending unit...repost -- page: 1 2

MICHV8

04-14-2025 @ 11:48 AM

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I created a separate thread for the sending unit..

The sending tube in the head is not budging. I soaked it overnight with 50/50 acetone and ATF and put heat on the head all around the tube opening I put an oversize open end wrench around the tube through the head and gave some light taps in different directions, but no luck. Can the glass tube at the dash gauge be removed from the metal backing and passed forward through the fire wall?

BTW, mine is the two part...tube and nut not the integrated screw in unit that Carpenter sells...

Any ideas? And thanks!

This message was edited by MICHV8 on 4-14-25 @ 4:29 PM

ford38v8

04-14-2025 @ 2:02 PM

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The dash unit will go through the hole, or the other way around, the sender through the hole, as was done during assembly . However, you may have to remove the harness and grommet to accommodate the dash assembly through the hole, which itself must be removed from the gauge unit. If I remember correctly, it is only two screws that mount it to the backside of the gauge. Don’t get anxious and cut the tube, you won’t repair that damage.

Alan

MICHV8

04-14-2025 @ 2:19 PM

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Thanks Alan...I have a loose spare 39 standard from 1971 that still has red fluid, so I measured the metal backing
(had 3 very small screws) and it didn't look like it would pass through the current deluxe firewall. I'll go ahead and remove the deluxe plate from the gauge and see if there is a way to sneak it through..

ford38v8

04-14-2025 @ 10:01 PM

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Mich, the sight glass is moveable within the bracket to fine tune the indicated temperature, so you might investigate the possibility that it is completely removable from the bracket if it won’t go through the hole in the dash. I do know the grommet should be removed and most likely the harness. One important thing about messing with the unit, try to minimize jostling it while the sight glass is inverted. Bubbles in the system are a pain to get rid of.

Alan

MICHV8

04-15-2025 @ 6:14 AM

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Alan
The deluxe face plate comes off fairly easy. What I'm trying to determine is whether the glass tube is soldered to the backing plate? It looks the the small rise where the glass tube exits the backing plate had 2 small hole 180 degrees apart that might indicate some a compression fitting. I do have a spare 39 standard that I can possibly use once I swap the gauge face plates. The sending tube of that standard backup is in a series of metal reducing connectors from some serious jury-rigging that I'm working on removing. The standard unit has be moved all around in the last 56 years so I'm sure it has bubbles. What is the procedure to remove those bubbles? Multiple tube heating/cooling? Thanks!

This message was edited by MICHV8 on 4-15-25 @ 6:18 AM

ford38v8

04-15-2025 @ 7:58 AM

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Removing the bubbles is a hit and miss process. I’ve suspended units upright with vibrators attached with minimal succsss, better luck attaching to a handheld centrifical force device, and even more luck by heating the bulb before spinning. For the heating nethod, I’d not recommend anything more aggressive than boiling water.

Alan

MICHV8

04-15-2025 @ 10:17 AM

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Alan,
If the glass tube can be positioned vertically for accuracy, can it not be removed completely? I'd like to slide the tube out the bottom...

ford38v8

04-15-2025 @ 12:19 PM

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Yes, that’s what I suggested you try. I haven’t done that, and haven’t one here to try, but looks like it would work.

Alan

MICHV8

04-15-2025 @ 1:13 PM

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Alan
I am trying to at least rotate the tube by gripping either above or below the bottom metal plate and nothing moves. So is the dome button above the plate contained in the piece below the plate? Thanks for the help...

ford38v8

04-15-2025 @ 2:11 PM

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Mitch, I'm afraid to tell you something and be wrong about it. you're in a much better position than I am at this point. Just so you understand fully what I meant about it being adjustable, look on the sight glass for an etched scratch mark across the glass. That scratch indicates 112º F, and should be adjusted to correspond to that mark on the gauge. It is that ability to be adjusted that makes me think it may be removable from the bracket. Proceed with care.

Alan

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