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Discussion Starter · #1 ·
So what causes this to randomly happen for a bit and then stop and be pretty steady again ?

Its happened about 4 times this year.
Earlier this year, once, it pegged at 120 for about 30-60 seconds.

Otherwise its pretty steady, sometimes a +/- 2mph sway.




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Lube the cable, it's about to break. Used to be 3 in 1 oil, something light like that. When it gets 10 jumping about 10 MPH, it's soon going to break. :(
 

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Discussion Starter · #4 · (Edited)
The curious bit is that this cable only has around 5000 miles on it and it was indeed lubed with a lot of graphite when it was put in. The randomness of the issue had me wondering if a brittle/old speedometer gear might be a cause more than lube on a new cable. eg. could a small part of a plastic gear broken off at that end. I've never heard of that happening but it seemed plausible.

This has been going on for a year and a few thousand miles now. Well, off-and-on, right, like noted above.
 

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If the Cable is fine, it almost has to be the Speedometer itself. I doubt it would be a Transmission problem. If it's not really an issue, you may want to just wait till it breaks. Maybe have a replacement ready in case it does.

Extra note on the Cable Lube though, I believe we would use Chassis Grease in ours.
 
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The one time (back in 1960 something) I lubed the speedo cable (because the needle was 'jumping and making a real racket) I used liquid graphite. I was told oil was incorrect but I do not remember why.

The liquid graphite solved my problems.

Pete
 

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