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1952 3100 Sending Unit Screw Size?
#1324963 Thu Sep 05 2019 05:23 PM
Joined: Jul 2019
Posts: 29
S
ssaxman Offline OP
Wrench Fetcher
Would anybody be able to tell me the size and thread pitch of the five screws that secure the sending unit into the tank on a '52 3100? I took one of my screws down to Home Depot and it screwed into both the #10-32 and #12-24 test bolts they had to check screw sizes. It only screwed into the #10-32 about 2/3 of the way until it got tight; screwed all the way into the #12-24 hole, but felt a little loose. I'd like to replace the screws that are currently installed with some nice stainless socket cap screws. Thank you!

Re: 1952 3100 Sending Unit Screw Size?
ssaxman #1324965 Thu Sep 05 2019 05:25 PM
Joined: May 2015
Posts: 2,498
K
Housekeeping (Moderator) Making a Stovebolt Bed & Paint and Body Shop Forums
Did you try 10-24? That's likely the correct size.


Kevin
First car '29 Ford Special Coupe
#2 - '29 Ford pickup restored from the ground up.
Newest Project - 51 Chevy 3100 work truck. Photos [flickr.com]
Busting rust since the mid-60's
Re: 1952 3100 Sending Unit Screw Size?
klhansen #1324966 Thu Sep 05 2019 05:34 PM
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Posts: 29
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ssaxman Offline OP
Wrench Fetcher
Thanks, Klhansen; I did not check #10-24. DOH!

Re: 1952 3100 Sending Unit Screw Size?
ssaxman #1324984 Thu Sep 05 2019 08:49 PM
Joined: Jul 2019
Posts: 29
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ssaxman Offline OP
Wrench Fetcher
#10-24 doesn't seem to work either.

Re: 1952 3100 Sending Unit Screw Size?
ssaxman #1324992 Thu Sep 05 2019 09:24 PM
Joined: Apr 2005
Posts: 8,781
Grease Monkey, Moderator General Truck Talk & Greasy Spoon
Is this an original tank? Many aftermarket tanks are metric threads.šŸ› 


Martin
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Re: 1952 3100 Sending Unit Screw Size?
ssaxman #1324999 Thu Sep 05 2019 10:41 PM
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Posts: 29
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ssaxman Offline OP
Wrench Fetcher
Justhorsenaround - no, it's an aftermarket replacement from Classic Parts. I'll check a comparable metric threaded screw and see if that works. Thanks!

Re: 1952 3100 Sending Unit Screw Size?
ssaxman #1325054 Fri Sep 06 2019 03:08 AM
Joined: May 2015
Posts: 2,498
K
Housekeeping (Moderator) Making a Stovebolt Bed & Paint and Body Shop Forums
I had to go check my original and repop tanks.
Both use 10-32 screws for the sending unit. Got my repop from Jim Carter. Made in Taiwan. Box is marked IGM 55A (20171214). I guess I bought it from the right place.
Closest metric size to 10-32 in my tap and die set is 5mm x 0.9. That may be what you need if it's metric.


Kevin
First car '29 Ford Special Coupe
#2 - '29 Ford pickup restored from the ground up.
Newest Project - 51 Chevy 3100 work truck. Photos [flickr.com]
Busting rust since the mid-60's
Re: 1952 3100 Sending Unit Screw Size?
ssaxman #1325064 Fri Sep 06 2019 05:08 AM
Joined: Apr 2005
Posts: 2,572
C
Shop Shark
I would just chase each screw hole with a good sharp 10-32 tap and then I'd know what it took.


Evan
Re: 1952 3100 Sending Unit Screw Size?
ssaxman #1325141 Fri Sep 06 2019 06:08 PM
Joined: May 2015
Posts: 2,498
K
Housekeeping (Moderator) Making a Stovebolt Bed & Paint and Body Shop Forums
If the holes are tapped metric, then chasing them with a 10-32 would work, but it would destroy some of the threads (which would be different pitch), increasing the potential to strip the threads in the tank. A 5mm x .9 metric thread would be about 30 threads per inch versus 32. 5mm is 0.197 inch major diameter, versus 0.190 inch for 10-32, so the 10-32 screw would be a bit undersized as well.
I'd try and track down the correct metric screws instead.


Kevin
First car '29 Ford Special Coupe
#2 - '29 Ford pickup restored from the ground up.
Newest Project - 51 Chevy 3100 work truck. Photos [flickr.com]
Busting rust since the mid-60's
Re: 1952 3100 Sending Unit Screw Size?
ssaxman #1325175 Sat Sep 07 2019 12:56 AM
Joined: Jul 2019
Posts: 29
S
ssaxman Offline OP
Wrench Fetcher
@coilover I thought about doing that, but there aren't many threads there due to the thickness of the tank and I'd hate to get myself up a creek without a paddle, haha.

@klhansen Thank you for the details. I'm going to give the metric screws a shot next time I have the back seat out. It was out this time so I could replace the hose that connects the filler neck to the tank, but that's another story.


Moderated by  Justhorsenround 

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