Go Back   The Ford Barn > General Discussion > Model A (1928-31)

Sponsored Links (Register now to hide all advertisements)

Reply
 
Thread Tools Display Modes
Old 10-12-2014, 12:42 PM   #1
dlfrisch
Senior Member
 
dlfrisch's Avatar
 
Join Date: Feb 2014
Location: Florida - 32128
Posts: 320
Default Speedometer Drive Gears

To start with, I had my speedometer checked and re calibrated, but still N.G.

Checking the turning of my cable on the dash, it turns backing up, but it does not turn going forward - at times it will click-in and turn a couple of times. Apparently this is what is making the mph numbers jump from 0 to ?? and the back to 0.

I checked the cable, it is OK - fits (locks) into the gear drive and the speedometer. I took the gear drive off of the drive shaft and it looks OK to me ( not sure what I'm looking at though) . The gear on the drive shaft slides back and forth about 38" - 1/4" .

I don't know what to do......maybe order a new secondary take off gear unit? Does anyone have any suggestions ?
Dave
dlfrisch is offline   Reply With Quote
Old 10-12-2014, 01:04 PM   #2
Kurt in NJ
Senior Member
 
Kurt in NJ's Avatar
 
Join Date: May 2010
Location: on the Littlefield
Posts: 5,247
Default Re: Speedometer Drive Gears

When I start on a problem like yours I would take a pocket screwdriver and put it in the drive hole while the wheels are turning (jacked up or on lift), this way I can feel if the drive gears can turn the cable
then I inspect the end of the cable for wear, most cables the inner core can be removed, then that end can be fitted into the gear shaft and checked for wear that can cause it to slip --moving it in or out to see if there is a worn spot that it slips
Also when the inner cable is out roll it on a table to look for bends and kinks that cause speedo needle wavering

sometimes the outer cable has been stretched making the inner cable too short and the square doesn't go far enough into the drive or speedo ---one repair in place of a new cable is a cut to length inner cable repair kit made longer then the "original'
Kurt in NJ is offline   Reply With Quote
Sponsored Links (Register now to hide all advertisements)
Old 10-12-2014, 01:58 PM   #3
portside
Member
 
Join Date: Jun 2014
Posts: 43
Default Re: Speedometer Drive Gears

Make sure that the cable end is crimped on tight and not slipping.
portside is offline   Reply With Quote
Old 10-12-2014, 07:07 PM   #4
dlfrisch
Senior Member
 
dlfrisch's Avatar
 
Join Date: Feb 2014
Location: Florida - 32128
Posts: 320
Default Re: Speedometer Drive Gears

Sponsored Links (Register now to hide all advertisements)
Thanks guys and 1930 Coupe for the ford barn back thread, a lot of good info. My 19 tooth gear is really warren in the center of the gear. I ordered a new gear and gasket from Mac's. I'll give it a try. I'm hoping that the drive shaft gear is OK. Looks a little warren on the front end - looks pretty good on the rear side. I can slide it back and forth about 3/8" or so, up to the clip and back. I hope that it is supposed to do that. I checked the cable turning - backing up it turns, going forward it may jump or basically not turn at all.
dlfrisch is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Sponsored Links (Register now to hide all advertisements)


All times are GMT -5. The time now is 12:23 AM.