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Username Post: Replacement Speedometer        (Topic#361971)
jimbob0464 
Newbie
Posts: 5

Reg: 07-17-19
07-31-20 10:57 AM - Post#2799995    

I have a 1954 3100 truck. I got a new (replica) speedometer. I installed it and now the speedometer does not work but the odometer does. Aside from the dash lights, is there any power that needs to be hooked up to the speedometer? I did not see anything when I took the old one out. As this is a brand new speedometer I think all I should do is hook up the cable. Since the odometer works I am thinking I did. Any suggestions?




 


RAM_51 
"4th Year" Silver Supporting Member
Posts: 5770
RAM_51
Loc: Yakima, WA. USA
Reg: 12-28-02
07-31-20 11:14 AM - Post#2799997    
    In response to jimbob0464

  • jimbob0464 Said:
Aside from the dash lights, is there any power that needs to be hooked up to the speedometer?


The entire speedometer / odometer is mechanical. There is a direct mechanical connection (series of gears) that operated the odometer...but NOT a direct mechanical connection to the speedometer needle.

It works by means of a rotating magnet inside of a drum that also has a magnet in it. Each time the rotating magnet passes the magnet in the drum, it pulls the drum with needle attached, away from ZERO. A very delicate "clock type" spring returns the needle to the zero position. The spring also aids in smoothing out the operation of the needle.

It is my guess that the drum or spring or both are damaged, or not hooked up correctly. This is actually the most delicate part of the speedometer. Once the speedometer is removed from it's case, you should be able to look behind the face plate to inspect the drum and spring mechanism. If it arrived in this condition, it may be best to contact the seller to work something out to get a replacement.


1951 Fleetline Preservation
'51 Fleetline DeLuxe 2 DOOR SEDAN (Fathom Green)
'51 Styleline Special BUSINESS COUPE (Shadow Gray)
'53 6500 Dump Bed (Oxidized Red)
'50 Styleline DeLuxe 4 DOOR SEDAN (Mist Green)


 
jimbob0464 
Newbie
Posts: 5

Reg: 07-17-19
07-31-20 11:25 AM - Post#2799998    
    In response to RAM_51

So either I got a defective speedometer (possible) or I somehow did not hook it up right( just as possible as it is the first time i ever did that).
How tight should the cable be? Just hand tight or more. I just did it hand tight.



 
RAM_51 
"4th Year" Silver Supporting Member
Posts: 5770
RAM_51
Loc: Yakima, WA. USA
Reg: 12-28-02
07-31-20 11:30 AM - Post#2799999    
    In response to jimbob0464

There is just one connection and that is the cable into the rear of the case. Hand tight is about all that is needed. If the odometer is working, it is hooked up properly. My guess is something is defective with the drum, magnets, spring, or even connection between the shaft and the needle. Is there even the slightest amount of movement of the needle or none?


1951 Fleetline Preservation
'51 Fleetline DeLuxe 2 DOOR SEDAN (Fathom Green)
'51 Styleline Special BUSINESS COUPE (Shadow Gray)
'53 6500 Dump Bed (Oxidized Red)
'50 Styleline DeLuxe 4 DOOR SEDAN (Mist Green)


 
jimbob0464 
Newbie
Posts: 5

Reg: 07-17-19
07-31-20 04:33 PM - Post#2800030    
    In response to RAM_51

There is no movement in the truck. However, I took it out and used a power tool and spun it and the needle did go up and down when I did that. I put it back in the truck and nothing. The end of the cable seemed like it was starting to spread apart like a power wire. So I'm thinking I need to replace the cable.




Edited by jimbob0464 on 07-31-20 04:35 PM. Reason for edit: No reason given.

 
RAM_51 
"4th Year" Silver Supporting Member
Posts: 5770
RAM_51
Loc: Yakima, WA. USA
Reg: 12-28-02
07-31-20 08:08 PM - Post#2800043    
    In response to jimbob0464

Try that. The cable should have a nice square end on it. I certainly do not understand how the odometer could be advancing and the needle not moving though.

1951 Fleetline Preservation
'51 Fleetline DeLuxe 2 DOOR SEDAN (Fathom Green)
'51 Styleline Special BUSINESS COUPE (Shadow Gray)
'53 6500 Dump Bed (Oxidized Red)
'50 Styleline DeLuxe 4 DOOR SEDAN (Mist Green)


 
BAJohnny 
Newbie
Posts: 48

Age: 71
Loc: Kentucky
Reg: 04-04-13
07-31-20 08:10 PM - Post#2800045    
    In response to jimbob0464

Did the old speedometer work? Could be the gears inside the trans.

1953 BelAir 2dr Sedan
1953 BelAir 2dr Hardtop


 
jimbob0464 
Newbie
Posts: 5

Reg: 07-17-19
08-01-20 07:11 AM - Post#2800062    
    In response to RAM_51

So, Going home last night the speedometer did work, kinda. It went up to 50mph when I was on the HWY and slowly went down to 40 even though I was doing 65. When I got off the HWY it went down to 20 and did not move after that. How far in does the cable have to go into the speedometer and would a frayed end cause it to act this way?



 
rrausch 
"16th Year" Silver Supporting Member
Posts: 14326
rrausch
Loc: L.A, Cal. & St. Louis...
Reg: 04-07-03
08-01-20 08:34 AM - Post#2800072    
    In response to jimbob0464

Did you know '54 to (about) '59 Chevy school busses used the same gauge set and speedo that the '54 and 1st series '55 pickups used. The '55 to roughly '59 school busses were also 12V, so the water temp is 12V electrical instead of mechanical, and the gas gauge is 12V also.

1953 210 Convertible, 261 with dual Carter YF 966S carbs, P.S., Remote Bendix P.B. Booster... shade-tree restoration about done.




 
2blu52 
"19th Year" Silver Supporting Member
Posts: 19378
2blu52
Age: 87
Loc: Montana
Reg: 03-12-02
08-01-20 09:01 AM - Post#2800075    
    In response to jimbob0464

Since the speedometer and the odometer are working to some extent then the problem lies in the speedometer and not in the cable.

"PEACE IS THAT GLORIOUS MOMENT IN HISTORY WHEN EVERY ONE STANDS AROUND RELOADING"

THOMAS JEFFERSON


 
RAM_51 
"4th Year" Silver Supporting Member
Posts: 5770
RAM_51
Loc: Yakima, WA. USA
Reg: 12-28-02
08-01-20 09:11 AM - Post#2800076    
    In response to jimbob0464

  • jimbob0464 Said:
How far in does the cable have to go into the speedometer and would a frayed end cause it to act this way?


If there is not a positive connection between the cable and the speedometer, the cable can conceivably spin faster than the receptacle in the speedometer...sort of a the way a clutch does when it is being engaged. The cable on my '53 protrudes approx 1/2" beyond the seating cup and is decidedly square.


Attachment: 1953_6500_Speedometer_Cable_-_Gauge_End..jpeg (2.48 MB) 2 View(s)




1951 Fleetline Preservation
'51 Fleetline DeLuxe 2 DOOR SEDAN (Fathom Green)
'51 Styleline Special BUSINESS COUPE (Shadow Gray)
'53 6500 Dump Bed (Oxidized Red)
'50 Styleline DeLuxe 4 DOOR SEDAN (Mist Green)


 
junky 
Valued Contributor
Posts: 3475

Loc: Northeast CT
Reg: 06-27-10
08-02-20 11:37 AM - Post#2800148    
    In response to jimbob0464

Disconnect the speedometer cable, and try to turn it from the speedometer head. If you can turn it, then the problem lies in the transmission. If you can't, then it is at the top end. I would pull the cable out of the sheath, and check it for damage (broken wire) by running it between a cotton cloth as if you were wiping it dry. If it snags, then it is defective and should be replaced. Do it in both directions. Also, if the cable doesn't protrude like in the picture above, then it might have been replaced at one time with one that is too short. The other think is the the square end might not be correct for your speedometer, or it might be worn enough to be slipping in the speedometer head.

Never argue with an idiot. He'll drag you down to his level, then beat you with experience.


 


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