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Bushing For Temp Gauge Sender---Found it! #1303129
Fri Mar 15 2019 06:33 AM
Fri Mar 15 2019 06:33 AM
E
Eureka Jim  Offline OP
Shop Shark
Joined: Feb 2013
Posts: 180
Pahoa, Hiwaii
I'm backdating the gauges on my '48 GMC with a 228 and need the bushing that fits into the cylinder head and receives the sending unit bulb for the gauge. I think it's the same one for both Chevy and GMC.

Thanks, Jim

Update March 23. I sure learned a lot about this little part! If you want a factory part, PM jerryschevyparts here on Stovebolt. He knew right away what part I needed. The part number for both Chevrolet and GMC is #597630. Chevy calls it a 'heat indicator conduit' while GMC calls it an 'adapter-engine temperature gauge'. The Chevy application is for '30-'40 models, though Jerry says some of the later trucks used it also. GMC used it for AD trucks that were not equipped with electric temp gauges, and maybe other trucks as well. Thanks to Tim I also looked into aftermarket bushings and while I wasn't able to get an answer from 'Classic Parts' regarding application I think their part will work as I did order one from Jim Carter and it is the right size. John at Jim Carter was most helpful. Also, I don't know how he finds stuff but George found a NOS part. I installed the used one I got from Jerry and it worked perfectly.

The interior threads are 5/8 by 18 TPI and the external thread is 1/2" taper (pipe thread).

Thanks everyone. Jim

Attached Files
Last edited by Eureka Jim; Sun Mar 24 2019 12:07 AM.
Re: Bushing For Temp Gauge Sender [Re: Eureka Jim] #1303151
Fri Mar 15 2019 03:41 PM
Fri Mar 15 2019 03:41 PM
tclederman  Offline
Boltergeist
Joined: Sep 2001
Posts: 27,508
Jarvisburg, NC


Tim
1954Advance-Design.com
1954 3106 Carryall Suburban - part of the family for 50 years
1954 3104 5-window pickup w/Hydra-Matic - part of the family for 14 years
Z-series (54/55) GMC 350 (2-ton) COE - now part of Dave's family
- If you have to stomp on your foot-pedal starter, either you, or your starter, or your engine, has a problem.
- The 216 and early 235 engine are not "splash oilers" - this is a splash oiler.
Re: Bushing For Temp Gauge Sender [Re: Eureka Jim] #1303167
Fri Mar 15 2019 05:52 PM
Fri Mar 15 2019 05:52 PM
E
Eureka Jim  Offline OP
Shop Shark
Joined: Feb 2013
Posts: 180
Pahoa, Hiwaii
No, Tim, that one doesn't work according to the seller. My truck came with a modern gauge that uses a smaller diameter temp sender bulb and the OEM part won't fit into the bushing. On a related note, the threads on the OEM part are squared off and I don't understand how they seal watertight, unless the original part is actually a compression fitting.

Re: Bushing For Temp Gauge Sender [Re: Eureka Jim] #1303180
Fri Mar 15 2019 07:49 PM
Fri Mar 15 2019 07:49 PM
tclederman  Offline
Boltergeist
Joined: Sep 2001
Posts: 27,508
Jarvisburg, NC
Oh, a modern gauge? Sorry, Jim

It seems to me people would then need to know the dimension?

Does the seller know what dimension will work (if the seller knows what will not work)?


Tim
1954Advance-Design.com
1954 3106 Carryall Suburban - part of the family for 50 years
1954 3104 5-window pickup w/Hydra-Matic - part of the family for 14 years
Z-series (54/55) GMC 350 (2-ton) COE - now part of Dave's family
- If you have to stomp on your foot-pedal starter, either you, or your starter, or your engine, has a problem.
- The 216 and early 235 engine are not "splash oilers" - this is a splash oiler.
Re: Bushing For Temp Gauge Sender [Re: Eureka Jim] #1303223
Sat Mar 16 2019 12:41 AM
Sat Mar 16 2019 12:41 AM
5
52Carl  Online
Master Gabster
Joined: Mar 2010
Posts: 7,783
Virginia
Originally Posted by Eureka Jim
I'm backdating the gauges on my '48 GMC with a 228 and need the bushing that fits into the cylinder head and receives the sending unit bulb for the gauge. I think it's the same one for both Chevy and GMC.

Thanks, Jim

What temperature gauge are you using?
If it is an original style temperature gauge, you won't need a bushing in a '48 228. The weird square-looking threaded bulb is indeed a compression fitting. The threads do not seal anything.
Carl

Re: Bushing For Temp Gauge Sender [Re: Eureka Jim] #1303225
Sat Mar 16 2019 01:08 AM
Sat Mar 16 2019 01:08 AM
tclederman  Offline
Boltergeist
Joined: Sep 2001
Posts: 27,508
Jarvisburg, NC
He has a “modern” gauge with yet unknown fitting size.

“ My truck came with a modern gauge that uses a smaller diameter temp sender bulb and the OEM part won't fit into the bushing.”


Tim
1954Advance-Design.com
1954 3106 Carryall Suburban - part of the family for 50 years
1954 3104 5-window pickup w/Hydra-Matic - part of the family for 14 years
Z-series (54/55) GMC 350 (2-ton) COE - now part of Dave's family
- If you have to stomp on your foot-pedal starter, either you, or your starter, or your engine, has a problem.
- The 216 and early 235 engine are not "splash oilers" - this is a splash oiler.
Re: Bushing For Temp Gauge Sender [Re: Eureka Jim] #1303231
Sat Mar 16 2019 02:02 AM
Sat Mar 16 2019 02:02 AM
E
Eureka Jim  Offline OP
Shop Shark
Joined: Feb 2013
Posts: 180
Pahoa, Hiwaii
Sorry to be confusing. Carl has it right that I'm trying to install an original gauge, a 212* Chevy gauge actually, to replace the modern electric gauge that was in my truck when I bought it. The hole in the cylinder head is tapped for 1/2" pipe threads and that is a larger diameter than the threads on the bulb. There was a bushing installed for the modern gauge sending unit but the bulb used is of a smaller diameter than the OEM part and is not a compression fitting, it seals by the threads in the bushing. I imagine that the bushing I need will have a machined seat below the threads that the bulb screws into. I don't even know if this part exists! I put the gauge cluster together using a Frankenstein collection of parts. I didn't think there would be a problem installing the temp gauge sending unit. Every job I do is a learning experience. If the OEM sending unit bolted directly to the head then I don't have a compatible part or I need an adapter busing.

Re: Bushing For Temp Gauge Sender [Re: Eureka Jim] #1303352
Sat Mar 16 2019 10:33 PM
Sat Mar 16 2019 10:33 PM
E
Eureka Jim  Offline OP
Shop Shark
Joined: Feb 2013
Posts: 180
Pahoa, Hiwaii
I think I found the GMC part number. In the GMC Master Parts Catalogue 1939-1951 section 7.485, under "Instruments" there is a listing for an "adapter, engine temperature gauge" # 597630. The parts catalogue has a great exploded illustration of the cylinder head that shows the adapter ---but not the part number--- and where it screws into the head. Finding the part number---if I got it right---wasn't easy!

Anyway, I'm still looking but at least I know the adapter is out there, somewhere!

Re: Bushing For Temp Gauge Sender [Re: Eureka Jim] #1303354
Sat Mar 16 2019 10:44 PM
Sat Mar 16 2019 10:44 PM
tclederman  Offline
Boltergeist
Joined: Sep 2001
Posts: 27,508
Jarvisburg, NC
Might this adapter work?

Autometer part #2372

1/2 npt male outer and 5/8 x18 internal

It was mentioned on oldGMCtrucks.com, but, the application was not clear.


Tim
1954Advance-Design.com
1954 3106 Carryall Suburban - part of the family for 50 years
1954 3104 5-window pickup w/Hydra-Matic - part of the family for 14 years
Z-series (54/55) GMC 350 (2-ton) COE - now part of Dave's family
- If you have to stomp on your foot-pedal starter, either you, or your starter, or your engine, has a problem.
- The 216 and early 235 engine are not "splash oilers" - this is a splash oiler.
Re: Bushing For Temp Gauge Sender [Re: tclederman] #1303360
Sat Mar 16 2019 11:35 PM
Sat Mar 16 2019 11:35 PM
E
Eureka Jim  Offline OP
Shop Shark
Joined: Feb 2013
Posts: 180
Pahoa, Hiwaii
Thanks, Tim. I'll have to call and talk with someone to see if it will work. The issue I see is that the OEM probe seals, as Carl said, as a compression fitting, not by the threads. Maybe I can cut new threads on the OEM probe to make it work like the aftermarket setup. Seems like a lot of work that may or may not work, so I hope someone has an original part.

If I can't find what I need maybe I should start a new thread on the engine forum and ask how to do this job. I'm sure someone has figured it out before. "None of us is as smart as all of us"

Or, I can probably buy a new reproduction electric gauge and sending unit. That means pulling everything out from the dash and taking the cluster apart again. I'm not a lazy person but I really don't look forward to doing that again! My neck still hurts from the last time being stuck under the dash!

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