Testing a Jumping Speedometer - The 1947 - Present Chevrolet & GMC Truck Message Board Network

TJBrown · 01-03-2012, 03:50 PM

Forgot to post this but i was having an issue with a speedo jumping on me at low speeds. I decided to do process of elim and figured out this little trick to bench test the speedo. I got a Q-Tip and put on end into a drill and put the other end of the Q-Tip in the back of the SpeedO housing. You can pull the trigger on the drill and test low mph all the way up to 75 mph (as fast as my 9.6v dewalt would turn) as a bench test. SpeedO was good, Turned out to be the upper cable. Hope this might help someone in the future.

*C-10 simplex* · 12-15-2012, 02:27 PM

Thank you.

GM-power · 12-15-2012, 03:48 PM

Shot grease in my cable line and once it got lubed up no more waving.
Posted via Mobile Device

cmyc5575 · 12-15-2012, 07:12 PM

I think that this is the issue with mine. You can hear it grinding likes its right behind the cluster.

gmclowsierra · 12-16-2012, 10:55 PM

Unhook.the cable from the speedo head and put a light oil down thr cable. Should loosen cable and smooth out the jumping needle.
Posted via Mobile Device

JRANGER · 12-17-2012, 12:09 PM

I had that problem too...but mine turned out to be multiple speedos...I finally got one that works after replacing the speedo cable, greasing the new cable, and buying several clusters from pull a part lol

01-03-2012, 03:50 PM	#1
TJBrown Registered User Join Date: Jul 2011 Location: Shreveport La Posts: 73	Testing a Jumping Speedometer Forgot to post this but i was having an issue with a speedo jumping on me at low speeds. I decided to do process of elim and figured out this little trick to bench test the speedo. I got a Q-Tip and put on end into a drill and put the other end of the Q-Tip in the back of the SpeedO housing. You can pull the trigger on the drill and test low mph all the way up to 75 mph (as fast as my 9.6v dewalt would turn) as a bench test. SpeedO was good, Turned out to be the upper cable. Hope this might help someone in the future. __________________ 85 Silverado SWB

12-15-2012, 02:27 PM	#2
C-10 simplex Account Suspended Join Date: Dec 2008 Location: indisclosed Posts: 1,515	Re: Testing a Jumping Speedometer Thank you.

12-15-2012, 03:48 PM	#3
GM-power Registered User Join Date: Mar 2012 Location: Little Rock, Arkansas Posts: 770	Re: Testing a Jumping Speedometer Shot grease in my cable line and once it got lubed up no more waving. Posted via Mobile Device __________________ 1979 Sierra Classic Heavy-half 1996 Silverado x-cab "the daily"

12-15-2012, 07:12 PM	#4
cmyc5575 Registered User Join Date: Jun 2012 Location: okc, OKlahoma Posts: 483	Re: Testing a Jumping Speedometer I think that this is the issue with mine. You can hear it grinding likes its right behind the cluster.

12-16-2012, 10:55 PM	#5
gmclowsierra Registered User Join Date: Mar 2008 Location: williamsport,pa Posts: 329	Re: Testing a Jumping Speedometer Unhook.the cable from the speedo head and put a light oil down thr cable. Should loosen cable and smooth out the jumping needle. Posted via Mobile Device

12-17-2012, 12:09 PM	#6
JRANGER Registered User Join Date: Nov 2011 Location: Nashville TN Posts: 3,595	Re: Testing a Jumping Speedometer I had that problem too...but mine turned out to be multiple speedos...I finally got one that works after replacing the speedo cable, greasing the new cable, and buying several clusters from pull a part lol __________________ PLEASE HELP WITH PROJECT UNDERHAULIN http://67-72chevytrucks.com/vboard/showthread.php?t=306320 Gemini - 1978 GMC C15 High Sierra - 305 c/e - Given to Mother Electra - 1967 Mustang Coupe - 302/w 3 speed Build Chyna - 1968 Chevy C20 Long Stepper



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