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Speedometer

Forum: C3 Electrical, Body and Interior

27 Messages
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Speedometer

Posted: 5/23/06 5:40pmMessage 1 of 27
R
RHeyboer
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Grandville, MI - USA
Joined: 5/8/2004
Posts: 140
Vette(s): 1968 427/390 Coupe

Can someone tell me why my speedometer is jumpy?

 

 

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Speedometer

Posted: 5/23/06 7:03pmMessage 2 of 27
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Ron 78
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BINGHAMTON, NY - USA
Joined: 7/19/2003
Posts: 3825
Vette(s): ......
Either the cable is dry,or it has a kink in it

C3VR Lifetime Member #93

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Speedometer

Posted: 5/23/06 7:10pmMessage 3 of 27
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Adams' Apple
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Duncanville, TX - USA
Joined: 11/8/2003
Posts: 22720
Vette(s): #1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas
Too much caffine?

Cable may need lubed, or replaced. Could also be a gear problem. If you can hear a scratchy noise in the dash, it's probably the cable.
Could also be the speedo head itself.

Joel Adams
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Speedometer

Posted: 5/24/06 3:20pmMessage 4 of 27
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Chips58
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Alice Springs, Australia
Joined: 5/6/2004
Posts: 535
Vette(s): 71 Coupe Black on Black
The only other reason is the nylon fitting at the gearbox.  They sometimes loose a tooth and it won't be long until the speedo fails all together.  Easy job to replace it or the cable.  If it's the speedo it my just need a good cleanout.  If the cleanout doesn't fix it a new speedo mechanism can be purchased.
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Speedometer

Posted: 5/24/06 3:38pmMessage 5 of 27
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longhorn294
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DeBerry, TX - USA
Joined: 2/27/2002
Posts: 1006
Vette(s): 1971 383 Stroker- mille miglia red...5 speed

 My speedometer works but my odometer and trip mileage thingy doesn't. What's that gonna take to fix? Thingy??? Must be beer thirty!

   I know the voices aren't real, but they have some pretty cool ideas...

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Speedometer

Posted: 5/24/06 8:44pmMessage 6 of 27
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Adams' Apple
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Duncanville, TX - USA
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Vette(s): #1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas
Odometer/trip thingy malfunctions require speedo head service/repair. No easy way out of this one.

Joel Adams
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Speedometer

Posted: 5/26/06 1:18pmMessage 7 of 27
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75BrownC3
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Rhineland, MO - USA
Joined: 4/11/2006
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Vette(s): Picked it up and it running good now. Just need to do a few more things and she will be 100 percent.
[QUOTE=longhorn294]

 My speedometer works but my odometer and trip mileage thingy doesn't. What's that gonna take to fix? Thingy??? Must be beer thirty!

[/QUOTE]

At least your milage stays the same no matter how far you drive. Comes in handy when the state historical society comes around to verify yearly milage.

 

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Speedometer

Posted: 5/31/06 8:46pmMessage 8 of 27
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aceinthehole
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Manteca, CA - USA
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Vette(s): 1978,two tone,Metalic Rootbeer & gold 1975 L48 4 speed
I love you folks. There isn't anything I enjoy more than collective thinking. Every attitude from every direction. That's beautiful people.

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Just can't wait to get on the road again.

 
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Speedometer

Posted: 6/1/06 3:24pmMessage 9 of 27
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RADARB8
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Montesano, WA - USA
Joined: 9/27/2003
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Vette(s): had a really nice one. sold it to a good friend. Purchased 2004 custom coupe in Feb. 2009 did not tell anyone here until August 2009. BAD I KNOW.

since we are talking speedo's, and no I don't wear them, mine seems to be about 6 to 8 degrees fast so if I am traveling at 70 miles per hour the police man says i was going 77?

anything to adjust it besides slowing down, i think that would be to long of a job and to hard to follow.

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Speedometer

Posted: 6/1/06 4:25pmMessage 10 of 27
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kstyer
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CUYAHOGA FALLS, OH - USA
Joined: 12/2/2003
Posts: 6424
Vette(s): 1975 C3 Red, T-Tops, Black Interior. All I need is time and money! Getting there!

All you need to do is change the driven gear in the transmission that drives the speedo cable.  Pull the old gear out, count the teeth, and get on with one more tooth.  It will read a bit slower.

For the Odometer not working, the gears in the speedo head are not working.  These are plastic/nylon and can strip or come out of place.  There are place to order the gears, but it may take a bit to get them.  It has to be a place that repairs speedos.    You can try Electro Sound on Brookpark Rd in Cleveland OH.   They have the parts.   It's not difficult to replace the gears......once the speedo is out of the dash.

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