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Speedo drive problem

Moderators: Curt!, Pa

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rev71112

Posts: 3

Joined: Tue Apr 02, 2013 3:45 pm

Post Wed Apr 03, 2013 4:39 pm

Speedo drive problem

I have a 1954 servi. Having speedo problem. New2:1 speedo , new cable, new drive gear (8 tooth) ring gear(20 tooth) looks good no sharp teeth, ect. PROBLEM: works fine forward, roll reverse 6" strips teeth off drive gear. Have ruined 3 drives. Any thoughts?
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Chris Haynes

Posts: 2622

Joined: Wed Jul 05, 2000 12:01 am

Location: Los Angeles, CA

Post Wed Apr 03, 2013 4:50 pm

Re: Speedo drive problem

Block off reverse. :D
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rev71112

Posts: 3

Joined: Tue Apr 02, 2013 3:45 pm

Post Wed Apr 03, 2013 5:30 pm

Re: Speedo drive problem

Can't even roll backwards. :(
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RUBONE

Posts: 380

Joined: Fri Nov 30, 2007 7:24 pm

Post Wed Apr 03, 2013 8:15 pm

Re: Speedo drive problem

Sounds like your drive gear in the rear end is off center. Rolling forward there is plenty of leeway for gear lash, in reverse it is binding on the cable drive and stripping the teeth. The drive ring need to be centered and locked into position.
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rev71112

Posts: 3

Joined: Tue Apr 02, 2013 3:45 pm

Post Thu Apr 04, 2013 12:02 pm

Re: Speedo drive problem

From what I can find the gear should be 3.84 " from end of axle. That sound right to you?

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