Speedometer help needed
#1
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Thread Starter
Join Date: Jul 2007
Location: Elizabeth City, North Carolina
Posts: 50
Speedometer help needed
Finally everything is back together and I took out the Cutlass a couple of weeks back. The speedometer seemed to be working fine, only a little bounce. After about 10 minutes, as I was accelerating, it just stopped around 30mph. It would slowly creep upwards as I maintained probably around 55. Then when I stopped, it remained around 30, with a very slow creep downward. I went home and parked it. The next day, the speedometer read 0, worked fine again for the first 10 minutes or so, then the problem repeated. Any ideas on where to start?
Thanks,
Ken
69 Cutlass S, TH350
Thanks,
Ken
69 Cutlass S, TH350
#3
Given the slow-to-return-to 0, disassemble and check movement of the needle. Old grease will solidify and act more like glue. SMALL amounts of wd40 can clean the crud out, just be careful not to touch anything else with it. Also the letters and numbers will be very delicate and can smear with just water...
If not comfortable doing this youself, a speedo repair shop will be a good option and they can also check / replace the magnets if they are weak also.
If not comfortable doing this youself, a speedo repair shop will be a good option and they can also check / replace the magnets if they are weak also.
#4
Registered User
Thread Starter
Join Date: Jul 2007
Location: Elizabeth City, North Carolina
Posts: 50
Too bad I didn't know of this when I had the dash and gauges out. It worked fine before the disassembly. Just Dashes cleaned the faces, but I didn't have any reason to think I would need an internal clean or repair.
Why couldn't this be as simple as a new cable or gear? Oh well.
Thanks for your help.
Ken
Why couldn't this be as simple as a new cable or gear? Oh well.
Thanks for your help.
Ken
#5
Reviving this old thread because I'm having the exact same problem with my just finished frame off on a 72 442 vert. It's a 4 speed and I installed a new cable and tranny drive gear. Was the speedo head the problem? I have a spare head. I had to relocate the output shaft gear aft to get the two gears to line up after I changed the tail shaft housing so the speedo cable woud hook up on the passenger side.
#6
If anyone was planning on answering don't bother - tested with another speedo head and did the exact same thing. Must be the speedo drive gear on the tail shaft is somehow mis-aligned with the plastic driven gear.
#14
I bench test the speedo tach and seems to be working well.. My gear indicator was broke when I pulled it out so I wonder if you can buy a replacement part for it.. I will start on the cable Monday
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