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#1473547 Wed Nov 02 2022 02:16 AM
Joined: Oct 2021
Posts: 1,627
O
'Bolter
My speedometer and odometer both work perfectly in that speed and distance are accurately recorded.

The odd thing is that the needle is jittery and bounces in a 5mph or so range when first starting out. It's most noticeable at 50-55. After a few minutes of driving it smooths out and stays perfectly still at whatever speed you're traveling.

The only thing I can think of is that the drive gear in the transmission needs to get warmed up with hot oil before it turns smoothly. Is it some other cause?

Is this something I need to deal with or should I leave well enough alone and get busy fixing the horn?

The speedometer cable is new. The gauge and tranny are original.

Last edited by Otto Skorzeny; Wed Nov 02 2022 02:17 AM.

1939 Packard Standard Eight Coupe (The Phantom)
1950 Chevrolet 3100 (Ol' Roy)
1956 Cadillac Coupe de Ville (The Bismarck)
1966 Oldsmobile Toronado (The Purple Knif)
1966 Ford Mustang (Little Red)
1964 Ford Galaxie 500 coupe
1979 Ford F-100
1976 Ford F-150 (Big Red)
1995 Ford F-150 (Newt)
Joined: Apr 2002
Posts: 2,191
F
Fox Offline
A teacher, but always an apprentice.
Mine turned out to be inside the speedometer. I had to disassemble and remove all the rock solid grease from 70 years ago. Disassembled, cleaned, and lubricated the gears. My needle hasn’t bounced since.


In the Stovebolt Gallery [stovebolt.com]
More pictures here [photos.app.goo.gl]

1951 GMC 9430 1 ton dually—-Shiny!

1970 Chevrolet C10 - Grandpa’s- My first truck.—in progress to shiny
1972 Chevrolet C20- Rusty- the puzzle box lid for the C10.
1950 Chevrolet 1300- in progress to shiny.
1962 AMC Rambler American- my wife’s

Parts trucks-
1951 GMC 9300
1951-GMC 9430
1951- Chevrolet 1300
Joined: Oct 2021
Posts: 1,627
O
'Bolter
Did yours bounce all the time? Mine only does it for the first 3 or 4 minutes of driving after a cold start up in the morning. After that it's steady as a rock for the rest of the day.


1939 Packard Standard Eight Coupe (The Phantom)
1950 Chevrolet 3100 (Ol' Roy)
1956 Cadillac Coupe de Ville (The Bismarck)
1966 Oldsmobile Toronado (The Purple Knif)
1966 Ford Mustang (Little Red)
1964 Ford Galaxie 500 coupe
1979 Ford F-100
1976 Ford F-150 (Big Red)
1995 Ford F-150 (Newt)
Joined: Feb 2016
Posts: 874
7
'Bolter
I agree with the thought of the speedo head needing attention. Mine was very noisy and erratic when cold, disassembled it, cleaned and very light lube on the input bushing, now it's quiet and smooth.


1957 Chevrolet 5700 LCF 283 SM420 single speed rear, 1955 IH 300U T/A, 1978 Corvette 350 auto, 1978 Yamaha DT175, 1999 Harley Davidson Softail Fat Boy
Joined: Oct 2021
Posts: 1,627
O
'Bolter
I guess I'll have to deal with that when I get under there to install new instrument panel bulbs.


1939 Packard Standard Eight Coupe (The Phantom)
1950 Chevrolet 3100 (Ol' Roy)
1956 Cadillac Coupe de Ville (The Bismarck)
1966 Oldsmobile Toronado (The Purple Knif)
1966 Ford Mustang (Little Red)
1964 Ford Galaxie 500 coupe
1979 Ford F-100
1976 Ford F-150 (Big Red)
1995 Ford F-150 (Newt)
Joined: Mar 2014
Posts: 3,205
J
'Bolter
Somewhere here I've shown how to remove the plug (or plugs) and lubricate the speedometer head...also have provided free image files (speedometer, gauge faces and odometer) for use with waterslide decal paper (use the white decal paper as your printer can not print in white). I want to say I even posted the reverse image for the odometer (black background with white numerals). It is all here somewhere. Good luck! I think the jittery needle problem is in the speedometer head in your case. Use a thin oil...you can use WD-40 if you spray a bit into a small jar and let it separate. The top layer will be a fine light oil and the bottom layer will be paraffin, immiscible solvents and other junk you don't need.

Last edited by Jon G; Wed Nov 02 2022 04:21 PM.

Jon

1952 1/2 ton with 1959 235
T5 with 3.07 rear end
Joined: Oct 2021
Posts: 1,627
O
'Bolter
Thanks.


1939 Packard Standard Eight Coupe (The Phantom)
1950 Chevrolet 3100 (Ol' Roy)
1956 Cadillac Coupe de Ville (The Bismarck)
1966 Oldsmobile Toronado (The Purple Knif)
1966 Ford Mustang (Little Red)
1964 Ford Galaxie 500 coupe
1979 Ford F-100
1976 Ford F-150 (Big Red)
1995 Ford F-150 (Newt)
Joined: Apr 2002
Posts: 2,191
F
Fox Offline
A teacher, but always an apprentice.
Mine bounced erratically. Sometimes a lot, others not a lot. It also made a terrible scratching sound. Slight, but awful. I think yours stops because of the truck/cab heating up? Perhaps the grease softens up a tad? Georgia is a lot warmer than up here! 😉 I’d still tear it open and clean it. I bet it stops. Good luck!


In the Stovebolt Gallery [stovebolt.com]
More pictures here [photos.app.goo.gl]

1951 GMC 9430 1 ton dually—-Shiny!

1970 Chevrolet C10 - Grandpa’s- My first truck.—in progress to shiny
1972 Chevrolet C20- Rusty- the puzzle box lid for the C10.
1950 Chevrolet 1300- in progress to shiny.
1962 AMC Rambler American- my wife’s

Parts trucks-
1951 GMC 9300
1951-GMC 9430
1951- Chevrolet 1300
Joined: Oct 2021
Posts: 1,627
O
'Bolter
Thanks. Today is only 37degrees this morning so I'll be able to see if it's related to the temperature.


1939 Packard Standard Eight Coupe (The Phantom)
1950 Chevrolet 3100 (Ol' Roy)
1956 Cadillac Coupe de Ville (The Bismarck)
1966 Oldsmobile Toronado (The Purple Knif)
1966 Ford Mustang (Little Red)
1964 Ford Galaxie 500 coupe
1979 Ford F-100
1976 Ford F-150 (Big Red)
1995 Ford F-150 (Newt)
Joined: Apr 2005
Posts: 11,480
Grease Monkey, Moderator General Truck Talk & Greasy Spoon and HiPo Forum
28* here this morning and the Speedo needle on our ‘62 C-10 started jumping around. After getting some heat into the cable, by driving, it settled down. It’s time for some speedo cable lube.


Martin
'62 Chevy C-10 Stepside Shortbed (Restomod in progress)
'47 Chevy 3100 5 Window (long term project)
‘65 Chevy Biscayne 4dr 230 I-6 one owner (I’m #2) “Emily”
‘39 Dodge Businessmans Coupe “Clarence”



"I fought the law and the law won" now I are a retired one!
Support those brave men/women who stand the "Thin Blue Line"! Hug a cop!
USAF 1965-1969 Weather Observation Tech (I got paid to look at the clouds)

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