Speedometer Problem
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Speedometer Problem
My 1965 speedometer bounces wildly afrer driving a few miles. I suspect te speedometer cable is at fault because the original 352 motor and transmission were replaced with a Windsor 351 and transmission (from a 1970 Torino I was told) before I bought the truck. How do I fix this - do I need a speedo cable from a 70 era Ford to fix this? Thoughts and suggestions?
Ford Parts Specialist
Joined: Nov 2006
Posts: 88,826
Likes: 787
From: Simi Valley, CA
Nylon gear retained to cable w/a C clip, same 16 - 21 toothed gears since 1960. EZ to find, prices range from 3 to 5 bucks. ID by tooth count and color.
No replacement speedometer head gears were ever offered by Ford, but speedo shops have them.
Post Fiend
Joined: Nov 2000
Posts: 6,060
Likes: 7
From: Glendale Arizona
"No replacement speedometer head gears were ever offered by Ford, but speedo shops have them."
There is no Physical connection between the input and the needle.
The input shaft works off of inductive magnets to act upon the disc the indicator is connected to. There is a small wound spring just below the face to bring the unit back to zero. If the head reads below zero there is a zero adjustment tang that can be slightly bent to adjust it. .
Dirt, spider webs and bug crap on the disc accumulates over time and can cause the bouncing as the tolerance is smaller. The slightest drag or friction will bounce it.
There is a helical cut gear on the input that runs a jack-shaft to a second jack-shaft that is in turn connected to the odometer gear.
Try a careful cleaning by taking the unit apart. And clean the cable in kerosene by soaking it along with the sleeve Re lube with white lithium grease. It needs to be really clean as any build up of old lube varnish will cause sticking.
Also check the condition of the Nylon gear in the transmission.
Garbz
There is no Physical connection between the input and the needle.
The input shaft works off of inductive magnets to act upon the disc the indicator is connected to. There is a small wound spring just below the face to bring the unit back to zero. If the head reads below zero there is a zero adjustment tang that can be slightly bent to adjust it. .
Dirt, spider webs and bug crap on the disc accumulates over time and can cause the bouncing as the tolerance is smaller. The slightest drag or friction will bounce it.
There is a helical cut gear on the input that runs a jack-shaft to a second jack-shaft that is in turn connected to the odometer gear.
Try a careful cleaning by taking the unit apart. And clean the cable in kerosene by soaking it along with the sleeve Re lube with white lithium grease. It needs to be really clean as any build up of old lube varnish will cause sticking.
Also check the condition of the Nylon gear in the transmission.
Garbz
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