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Speedometer issues
Posted by: Jeff+Carrie63 ()
Date: November 13, 2017 09:02AM

My recent purchase on a 1963 Corvair Monza 900 apparently came with a speedometer that is erratic at times. It seems to do OK at times, but then other times it locks on a speed or pegs out to the far right. Has anyone tinkered with these? Could it be just a wiring short of some kind?
Thanks.

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Re: Speedometer issues
Posted by: RobertC ()
Date: November 13, 2017 09:07AM

Not electrical / it is mechanical.

Could be the speedo cable.

Disconnect and spray a lubricant down the cable.

I think you can remove the inner cable - and clean it / see if it is frayed.

Might try spraying a very small amount of lubricant on the back of the speedo head - you might get lucky.

I assume you can get a new speedo cable from Clark's / vendors.

Also, could be with the gear / adapter that goes in the differential. I do not know if these have been reproduced.



Edited 1 time(s). Last edit at 11/13/2017 09:11AM by RobertC.

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Re: Speedometer issues
Posted by: Jeff+Carrie63 ()
Date: November 13, 2017 09:13AM

Thanks. Appreciate the response and suggestions. I'll take a look at it and see if that helps.

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Re: Speedometer issues
Posted by: RobertC ()
Date: November 13, 2017 09:16AM

You should get the shop manuals if yo do not already have them.

You need the 61 Manual and the 63 supplement.

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Re: Speedometer issues
Posted by: Huntsville ()
Date: November 13, 2017 09:18AM

The speedometers are mechanical, driven by a cable from the differential.

The problem could be in the speedometer or the cable.

The inner cable could be dry and just need to be cleaned and relubed. Unscrew the cable from the back of the speedometer, then the inner cable can be pulled completely out of the sheath. If the cable is in good condition, lubricate it and re-install it. I use white lithium spray lubricant on the cable and spray just a little in the end of the sheath before putting the cable back in. Lubricate sparingly, as the lubricant can work its way up into the speedometer if too much is used.



Danny Robertson
Huntsville, Al
'64 Spyder (Daily Driver)
'63 Rampside (Rotisseried and in Progress!)

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Re: Speedometer issues
Posted by: Jeff+Carrie63 ()
Date: November 13, 2017 09:39AM

Appreciate the responses. I am all new to Corvairs, but willing to learn. Should have known it was just mechanical in these cars. Love this forum. Really appreciate the knowledge here.

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Re: Speedometer issues
Posted by: MattNall ()
Date: November 13, 2017 11:14AM

Welcome to the CCF! Start a New topic and introduce yourselves!





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Re: Speedometer issues
Posted by: richard1 ()
Date: November 14, 2017 04:27PM

If it is sticking in places, it is not the cable, although it probably needs lube anyway. I use 10W-30 in the cable.

But the needle can rub the front or rear of the faceplate, or it could have dust or rust on the needle. clean it with air, add powdered graphite where needed, and inspect for rubbing no gasket at the face plate makes the needle hit certain places on the front of the faceplate, two gaskets makes it hit the rear.

It is driven by magnetic force, with a spring dampening it.

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