The Ford Barn

Bruce Adams · 01-06-2014, 02:41 PM

Hi,
I purchased a rebuilt 1930-1931 round Stewart Warner Speedometer from a major rebuilder/supplier after my Northeast Speedo started making a strange noise. The Northeast always read SPOT ON, but the rebuilt replacement, reads 10% faster than my actual speed as checked by my GPS speedometer app and police speed billboards. (reads 60 at 54 mph)
I checked my Northeast speedo many time on those police billboards and never questioned it since it was always spot on.
A knowledgeable friend said the oval speedo can be adjusted.
Can the round 1930 - 1931 speedo be adjusted?
I have the standard drive unit and standard rear end in the car.
I have not checked the odometer and just now figured I could check it against my Modern car's odometer over a particular run.
Thanks

Patrick L. · 01-06-2014, 03:54 PM

This'll be interesting. Mine also reads low and I have not noticed any adjustment method but haven't really looked closely. I've been thinking about changing drive gears.

Herb Concord Ca · 01-06-2014, 07:33 PM

Bruce, yes the round SW speedo is adjustable. I needed to adjust mine as it was about 10mph off.
I didn't change the spring position.
There is a magnet under / behind the mph wheel, that is what I adjusted. Like you, I used a GPS to check my speed, got mine to within 1-2mph. Took 2 tries.
Good Luck

papanick · 01-06-2014, 08:41 PM

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Bruce I just send you all the info you need.

01-06-2014, 02:41 PM	#1
Bruce Adams Senior Member Join Date: May 2010 Location: Northport, NY Posts: 1,597	Speedometer Adjustment ? Hi, I purchased a rebuilt 1930-1931 round Stewart Warner Speedometer from a major rebuilder/supplier after my Northeast Speedo started making a strange noise. The Northeast always read SPOT ON, but the rebuilt replacement, reads 10% faster than my actual speed as checked by my GPS speedometer app and police speed billboards. (reads 60 at 54 mph) I checked my Northeast speedo many time on those police billboards and never questioned it since it was always spot on. A knowledgeable friend said the oval speedo can be adjusted. Can the round 1930 - 1931 speedo be adjusted? I have the standard drive unit and standard rear end in the car. I have not checked the odometer and just now figured I could check it against my Modern car's odometer over a particular run. Thanks

01-06-2014, 03:54 PM	#2
Patrick L. Senior Member Join Date: May 2010 Location: Largo Florida Posts: 7,225	Re: Speedometer Adjustment ? This'll be interesting. Mine also reads low and I have not noticed any adjustment method but haven't really looked closely. I've been thinking about changing drive gears.

01-06-2014, 07:33 PM	#3
Herb Concord Ca Senior Member Join Date: May 2010 Location: Concord CA Posts: 755	Re: Speedometer Adjustment ? Bruce, yes the round SW speedo is adjustable. I needed to adjust mine as it was about 10mph off. I didn't change the spring position. There is a magnet under / behind the mph wheel, that is what I adjusted. Like you, I used a GPS to check my speed, got mine to within 1-2mph. Took 2 tries. Good Luck

01-06-2014, 08:41 PM	#4
papanick Senior Member Join Date: Mar 2012 Location: gouverneur n,y, Posts: 2,840	Re: Speedometer Adjustment ? Sponsored Links (Register now to hide all advertisements) Bruce I just send you all the info you need.