The Ford Barn

Tom Cavallaro · 05-21-2013, 01:56 PM

Took the Model A out for the first time since winter. While driving passed a police meter sign and said I was doing 26 in a 25 mph zone. My Speedo said I was doing 16. That tells me my speedo is 10 mph off. How do I correct this differance?
Tom

ford3 · 05-21-2013, 02:50 PM

you will need another speedo turtle with 2 less teeth on it that the one you now have, usually one tooth up or down equals 5 mph

Tom Cavallaro · 05-21-2013, 05:33 PM

Where is this gear that I am to replace...where do I find it...or part number?? Thanks so much for getting back to me. Why is it different now??
Tom

1931 flamingo · 05-21-2013, 05:44 PM

The "turtle" is located on the torque tube. It's what the lower end of the speedo cable attaches to. Removes with two bolts. Do a search on how to dis-assemble to replace the gear, some one has posted WITH pictures. Gears are available from most vendors.
Paul in CT

H. L. Chauvin · 05-21-2013, 06:33 PM

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Hi Tom,

Not being a Model A speedometer expert, if one does a "Search" above, it was mentioned before in: "Calibrate Speedometer" 02/08/13 that the first thing to check on an inaccurate speedometer is the speedometer gear on the drive shaft to see if it is properly controlling the odometer.

For example, first drive an accurately measured few mile distance to see if the odometer is correct -- if it is, leave the drive shaft gear alone -- if it is incorrect, change the gear.

With the correct odometer reading & an incorrect speedometer reading, the next thing to do is make corrections to the speedometer.

Excellent articles, photos, & illustrations in the replies to this 02/08/13 post.

Hope this helps.

05-21-2013, 01:56 PM	#1
Tom Cavallaro Senior Member Join Date: Nov 2011 Location: Barrington, NJ Posts: 280	Speedometer Took the Model A out for the first time since winter. While driving passed a police meter sign and said I was doing 26 in a 25 mph zone. My Speedo said I was doing 16. That tells me my speedo is 10 mph off. How do I correct this differance? Tom __________________ I work very hard to avoid all and any mistakes. I thought I made a mistake once, but I was wrong.

05-21-2013, 02:50 PM	#2
ford3 Senior Member Join Date: Oct 2012 Location: oroville calif. Posts: 1,453	Re: Speedometer you will need another speedo turtle with 2 less teeth on it that the one you now have, usually one tooth up or down equals 5 mph

05-21-2013, 05:33 PM	#3
Tom Cavallaro Senior Member Join Date: Nov 2011 Location: Barrington, NJ Posts: 280	Re: Speedometer Where is this gear that I am to replace...where do I find it...or part number?? Thanks so much for getting back to me. Why is it different now?? Tom __________________ I work very hard to avoid all and any mistakes. I thought I made a mistake once, but I was wrong. Last edited by Tom Cavallaro; 05-21-2013 at 05:35 PM. Reason: Spelling

05-21-2013, 05:44 PM	#4
1931 flamingo Senior Member Join Date: May 2010 Location: new britain,ct 06052 Posts: 9,390	Re: Speedometer The "turtle" is located on the torque tube. It's what the lower end of the speedo cable attaches to. Removes with two bolts. Do a search on how to dis-assemble to replace the gear, some one has posted WITH pictures. Gears are available from most vendors. Paul in CT

05-21-2013, 06:33 PM	#5
H. L. Chauvin Senior Member Join Date: May 2010 Posts: 4,179	Re: Speedometer Sponsored Links (Register now to hide all advertisements) Hi Tom, Not being a Model A speedometer expert, if one does a "Search" above, it was mentioned before in: "Calibrate Speedometer" 02/08/13 that the first thing to check on an inaccurate speedometer is the speedometer gear on the drive shaft to see if it is properly controlling the odometer. For example, first drive an accurately measured few mile distance to see if the odometer is correct -- if it is, leave the drive shaft gear alone -- if it is incorrect, change the gear. With the correct odometer reading & an incorrect speedometer reading, the next thing to do is make corrections to the speedometer. Excellent articles, photos, & illustrations in the replies to this 02/08/13 post. Hope this helps.