SPEEDOMETER TESTING

-
CFD244

CFD244

"I LOST MY ID IN A FLOOD"
FABO Gold Member
Joined
Sep 7, 2017
Messages
4,127
Reaction score
5,807
Location
Northern Ontario, Canada
Hi Folks

I want to test my rally speedometer with a drill. Can anyone tell me what direction the speedo cable rotates if you are looking straight at the back of the speedo.

Thanks
 
The speedo cable turns the way the needle moves, so looking at the back that would be counter clockwise.
 
yeah, lefty in direction of needle travel.

 
Last edited:
Don't think you can damage it by running it backwards. Backing up rotates the speedo backwards.
 
Makes sense. But, I wasn't sure, and this is the place to get the right info. Thanks again everyone.
 
Do a quick turn by hand, to see which way it moves.
 
If you look at the input and turn by hand you'll see its a worrm gear. The worm drives the odo and can do so either direction.
It also spins the open shell. magnets turn the drum which is restrained (calibrated) with a tiny clockspring right behind the dial.

Even though its non electrical, I posted there 'cause most instrumentation discussions seem to end up there.
Speedometer evaluation?

Mine had a little sideplay in the input shell. very gently checked with a dial indicator.
upload_2020-3-6_13-54-23.png


And a lot in the drum (.020").
 
You must log in or register to reply here.
-

Back
Top