The Ford Barn

David Russell · 10-15-2012, 09:52 PM

Hi, I have a 1931 Town Sedan and the speedometer reads about half of the speed I am actually driving. Any ideas? Thanks for any help. Dave

ba49 · 10-15-2012, 10:42 PM

Dave, I had the same problem with my 30 Town Sedan when I bought it. Actual speed was about 2x what the speedo was showing. I sent it to a guy that advertises here in the Swapmeet. I think he charged me like $40. to adjust itm. Now it's only like 1-2 mph off. I think he calls himself Govenuer in his ads.
Bill

Bob from Northport · 10-16-2012, 08:14 AM

Can anyone out there advise what the possible problem in the speedometer might be?? What is causing it to show half speed??

Thanks!!

Tom Wesenberg · 10-16-2012, 08:20 AM

Quote:

Originally Posted by Bob from Northport

Can anyone out there advise what the possible problem in the speedometer might be?? What is causing it to show half speed??

Thanks!!

Either the magnet is very weak or the wheel may be dry and binding. I can't believe the adjustment could be that far off. How is the odometer? You need the miles to be accurate first, then the speed. The odometer is made accurate by the driven gear on the torque tube. It needs to have the correct number of teeth to match the tire size and rear end ratio.

Bob from Northport · 10-17-2012, 07:51 AM

Thanks Tom!! The car belongs to a friend that purchased the car a year ago. The speedometer unit was replaced with a Snyders rebuilt unit about 5 years ago, and always worked very well. I just didn't know where to tell him to look. The torque tube gear assembly, or the speedometer unit inside. I have never seen one work at half speed.

Thanks again!!

Bob Campbell

Jim Brierley · 10-17-2012, 11:12 AM

Sponsored Links (Register now to hide all advertisements)

If the gear on the torque tube is correct for the rear end ratio, the cable will revolve 1,000 times in 1 mile. If it does this the odometer will be right. If the odometer is correct and the speedo wrong, it is the magnet or its relation to the "needle".

10-15-2012, 09:52 PM	#1
David Russell Junior Member Join Date: Jun 2011 Location: Laguna Beach, CA Posts: 9	Speedo Inaccurate Hi, I have a 1931 Town Sedan and the speedometer reads about half of the speed I am actually driving. Any ideas? Thanks for any help. Dave

10-15-2012, 10:42 PM	#2
ba49 Senior Member Join Date: Jun 2012 Location: Sheffield Lake, Ohio Posts: 137	Re: Speedo Inaccurate Dave, I had the same problem with my 30 Town Sedan when I bought it. Actual speed was about 2x what the speedo was showing. I sent it to a guy that advertises here in the Swapmeet. I think he charged me like $40. to adjust itm. Now it's only like 1-2 mph off. I think he calls himself Govenuer in his ads. Bill

10-16-2012, 08:14 AM	#3
Bob from Northport Senior Member Join Date: May 2010 Location: 215 E. 6th Street Northport, Michigan 49670 Posts: 941	Re: Speedo Inaccurate Can anyone out there advise what the possible problem in the speedometer might be?? What is causing it to show half speed?? Thanks!! __________________ Bob from Northport Northport, Michigan

10-17-2012, 07:51 AM	#5
Bob from Northport Senior Member Join Date: May 2010 Location: 215 E. 6th Street Northport, Michigan 49670 Posts: 941	Re: Speedo Inaccurate Thanks Tom!! The car belongs to a friend that purchased the car a year ago. The speedometer unit was replaced with a Snyders rebuilt unit about 5 years ago, and always worked very well. I just didn't know where to tell him to look. The torque tube gear assembly, or the speedometer unit inside. I have never seen one work at half speed. Thanks again!! Bob Campbell __________________ Bob from Northport Northport, Michigan

10-17-2012, 11:12 AM	#6
Jim Brierley Senior Member Join Date: Jun 2010 Location: Temecula, CA Posts: 4,087	Re: Speedo Inaccurate Sponsored Links (Register now to hide all advertisements) If the gear on the torque tube is correct for the rear end ratio, the cable will revolve 1,000 times in 1 mile. If it does this the odometer will be right. If the odometer is correct and the speedo wrong, it is the magnet or its relation to the "needle".