Gain extra benefits by becoming a Supporting Member Click here find out how!

Classic Performance Products Classic Parts
American Auto Wire Classic Industries
Danchuk Catalog
Hellwig Products IncPerformance Rod & CustomNu-Relics Power Windows



Username Post: Speedometer reading        (Topic#358876)
Salvy1068 
Newbie
Posts: 2

Reg: 09-27-17
11-19-19 04:57 PM - Post#2780546    

Having an issue with my speedo. Changed the cable and checked the tranny sending gear as good. The reading only matches true gps speed at 55mph or above. Below 55mph no linear error at different speeds. Here’s what I’m seeing:
GPS 50 mph. Gauge 30 mph.
GPS 40 mph. Gauge 15 mph.
GPS 30 mph. Gauge 10 mph.
Below that it just bounces around.

Was thinking a ratio adapter may do the trick but the speedo/gps is not off by the ratio at all speeds. Any ideas?



 


2blu52 
"18th Year" Silver Supporting Member
Posts: 19043
2blu52
Age: 86
Loc: Montana
Reg: 03-12-02
11-19-19 05:46 PM - Post#2780549    
    In response to Salvy1068

I am guessing that you need a good cleaning and nothing more.I am basing that on the different readings at different speeds and the manner in which the speedometer works based on the central spring winding up or down.

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

THOMAS JEFFERSON


 
dsacton 
"2nd Year" Silver Supporting Member
Posts: 1185
dsacton
Loc: Boulder, CO
Reg: 11-01-11
11-19-19 08:59 PM - Post#2780566    
    In response to 2blu52

Yes--that was my experience as well. Especially the bouncing; it takes almost nothing to throw these off.

Scott Acton
1954 Chevy Bel Air 2-door
http://www.my54chevy.com


 
rrausch 
"15th Year" Silver Supporting Member
Posts: 14129
rrausch
Loc: L.A, Cal. & St. Louis...
Reg: 04-07-03
11-19-19 10:27 PM - Post#2780568    
    In response to dsacton

Yes, the needle pivot among other parts needs to be lubricated.

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




 
40grit 
Contributor
Posts: 573
40grit
Age: 74
Loc: Chattanooga, Tn
Reg: 07-08-13
11-22-19 01:50 AM - Post#2780729    
    In response to rrausch

I agree with all above.

Taking the speedometer apart is not difficult. Just be careful and treat it gently. You will enjoy getting it all cleaned up and looking new sgain.

John





Just Slightly Abrasive


 
RAM_51 
"3rd Year" Silver Supporting Member
Posts: 5431
RAM_51
Loc: Yakima, WA. USA
Reg: 12-28-02
11-22-19 11:39 AM - Post#2780762    
    In response to Salvy1068

I've posted his photo before but now seems like a good time to post it again. You should also remove the brass plug and lube this area. You can use a drill bit to pry the plug out in order to reuse it. There is a fiber wick also that would have to be removed. I use a straight pin to remove it. I usually use a light oil here...3 in 1...is a good choice. After getting things moving and making sure all internal parts have been well oiled, replace the wick and plug.

Attachment: speedo_lube.jpg (319.43 KB) 1 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)


 
2D51STYDLX 
"9th Year" Silver Supporting Member
Posts: 1055
2D51STYDLX
Loc: So. Prairie Washington
Reg: 03-03-11
11-22-19 11:53 AM - Post#2780764    
    In response to Salvy1068

I think it was Wagonman who posted a great article on speedo service.

Roger
1951 2 door Deluxe Bone stock, well not quite, bucket seats.
Broken hearts and dirty windows
Make life difficult to see
Thats why last night and this morning
Always look the same to me
John Prine



 
40grit 
Contributor
Posts: 573
40grit
Age: 74
Loc: Chattanooga, Tn
Reg: 07-08-13
11-22-19 09:27 PM - Post#2780796    
    In response to 2D51STYDLX

It was on here I think I picked up the tip to pull the plug in order to clean and lube the bushing. That really made the speedometer spin free, like new.

John

Just Slightly Abrasive


 
WagonMan 
"9th Year" Silver Supporting Member
Posts: 1647
WagonMan
Age: 71
Loc: Las Vegas, NV
Reg: 10-26-04
11-22-19 10:11 PM - Post#2780800    
    In response to 2D51STYDLX

The link is in the stock 55-57 sticky area. It details a 57 but most years are similar inside.

Charles

57 210 4dr. Wagon(bought '82)
-350/700r4 Mild Custom
56 BA 4dr. ht.(bought '98)
-265/TH350 Mostly Stock
29 Ford Sedan(bought '75)
-4.3L/TH350(in progress)


 


Icon Legend Permissions Topic Options
Report Post

Quote Post

Quick Reply

Print Topic

Email Topic

384 Views
FusionBB
FusionBB™ Version 2.1
©2003-2006 InteractivePHP, Inc.
Execution time: 0.071 seconds.   Total Queries: 18   Zlib Compression is on.
All times are (GMT -0800) Pacific. Current time is 07:01 AM
Top