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09-23-2020, 01:10 PM | #1 |
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Join Date: Aug 2017
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‘46 pickup speedometer—notes & question
Since my speedometer needle was sticking against the back plate at about “40 mph,”, I decided to remove just the odometer unit, rather than taking out the entire gauge array behind the glass. A whole lot of contorted reaching under the dash led me to take out 5 threaded screws and turning off the speedo cable holder and retracting the drive inner cable. Also pried out the two light bulbs.
— the unit, a Stewart Warner 679x/ P1 by its label, was not visibly defective, but I disassembled it down to the gears. Lubricated with clock oil and a little grease to the pinion. —the squared off inner cable needed to be filed in order to seat it firmly back in the square receiver. The knurled keeper would otherwise not reach the threaded end of the odometer shaft —the needle itself may have been soldered on. It fell off when I straightened the indicator needle. Glued it back with gel super glue and then when dry, a dash of Duco cement. —I could not easily have replaced the screws in that cramped space without the aid of a clever holding tool made by Ullman devices https://ullmandevices.com/collections/specialty-tools After all was re-fitted, I checked the transmission end of the cable and made sure it felt seated, though I could not see that. I also squirted some Aero Kroil down the cable from the dash side, hoping gravity and this oil’s excellent penetration would do some good. The inner cable seemed to turn by finger pressure without binding. The repair fixed the sticking needle. Yet, the needle bounces around when accelerating. It jiggles in 10 -15 mph increments. Can anyone tell me what might cause that jumping? The obvious culprit is the cable itself, whether binding against the outer cable or slipping in the square hole. I’ve never seen a working ‘46 speedometer and so I’m ignorant about what is normal. |
09-23-2020, 01:40 PM | #2 |
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Join Date: May 2012
Location: u-rah-rah-Wisconsin
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Re: ‘46 pickup speedometer—notes & question
I can't speak to the pickup version, but the speedo in my 46 Tudor has an steady sweep as does my 49 F1. Your thought on a cable issue would seem correct.
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19 and 49 F1 - jes' like Henry II built 1946 Deluxe - as Henry built it Last edited by FortyNiner; 09-23-2020 at 08:30 PM. |
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09-23-2020, 03:46 PM | #3 |
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Join Date: Jul 2014
Location: Iowa
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Re: ‘46 pickup speedometer—notes & question
If the cable and sheath are in good condition with no kinks, and are sufficient lubricated, it is likely an internal wear problem. At our shop we send them to Bob's Speedometer, They will inspect the unit and give you an estimate of repair costs. 1-800-592-9673.
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09-23-2020, 04:35 PM | #4 |
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Join Date: Aug 2017
Location: WA-OR, USA
Posts: 66
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Re: ‘46 pickup speedometer—notes & question
Before removing the speedometer for repair, might try lubing the cable again with something more substantial. Aero Kroil isn't much of a lubricant in my experience.
Good luck! |
09-23-2020, 07:57 PM | #5 |
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Join Date: Apr 2018
Location: Chelmsford, ON Canada
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Re: ‘46 pickup speedometer—notes & question
The speedometer in my’46 Coupe was “surging” at lower speeds. What I found was the cable wasn’t routed square into the back of the speedometer. Rerouted and the problem went away.
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09-23-2020, 08:03 PM | #6 |
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Location: Orcas Island Washington
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Re: ‘46 pickup speedometer—notes & question
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Owner/Operator of 'Jailbar Ranch' on the side of Mt. Pickett. Current stable consists of 1946 1/2 ton pickup turned woodie wagon with FH V8, 1947 Tonner Pickup (red) mostly stock with exception of a cummins 6at turbo diesel, 1946 Tonner Pickup (green) with 226 cu in 6 cyl flathead, 1979 Toyota landcruiser wagon, completely encased in 1947 Ford Jailbar sheet metal. Ok, cornbinder rear fenders..... 'Rusty ol' floorboards, hot on their feet' (Alan Jackson) |
09-24-2020, 09:22 AM | #7 |
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Join Date: Aug 2017
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Re: ‘46 pickup speedometer—notes & question
My ‘46 half ton was equipped with a four speed transmission, conventional 16” wheels
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09-24-2020, 10:10 AM | #8 |
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Join Date: Jan 2014
Location: Orcas Island Washington
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Re: ‘46 pickup speedometer—notes & question
Like I said, I could be wrong. Somebody here will know. Perhaps the 60 mph speedo was because you have the 'big truck' 4 speed trans. As far as the bouncing needle, I'm watching your thread for info!
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Owner/Operator of 'Jailbar Ranch' on the side of Mt. Pickett. Current stable consists of 1946 1/2 ton pickup turned woodie wagon with FH V8, 1947 Tonner Pickup (red) mostly stock with exception of a cummins 6at turbo diesel, 1946 Tonner Pickup (green) with 226 cu in 6 cyl flathead, 1979 Toyota landcruiser wagon, completely encased in 1947 Ford Jailbar sheet metal. Ok, cornbinder rear fenders..... 'Rusty ol' floorboards, hot on their feet' (Alan Jackson) |
09-24-2020, 12:49 PM | #9 |
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Join Date: Aug 2017
Posts: 3
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Re: ‘46 pickup speedometer—notes & question
Thanks for the tips, guys. I removed the 53” cable and squirted it with Deep Creep, some graphite lubricant for locks, and then 3 in 1 oil. The inner shaft spun freely but alas the needle bounced as much as ever. I’m used to estimating speed, anyway. Might try Bob’s Speedometer to see if the hair spring or magnet are the problem.
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09-25-2020, 07:25 AM | #10 |
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Join Date: Jan 2014
Location: Orcas Island Washington
Posts: 4,844
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Re: ‘46 pickup speedometer—notes & question
I had my son put the speedometer app on my phone.
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Owner/Operator of 'Jailbar Ranch' on the side of Mt. Pickett. Current stable consists of 1946 1/2 ton pickup turned woodie wagon with FH V8, 1947 Tonner Pickup (red) mostly stock with exception of a cummins 6at turbo diesel, 1946 Tonner Pickup (green) with 226 cu in 6 cyl flathead, 1979 Toyota landcruiser wagon, completely encased in 1947 Ford Jailbar sheet metal. Ok, cornbinder rear fenders..... 'Rusty ol' floorboards, hot on their feet' (Alan Jackson) |
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