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How do I fix a bouncing Speedo needle?
My speedo needle has a habit of bouncing up and down especially at lower speeds (5-40 mph). Higher than that it usually holds pretty steady.
What could be the cause of this? - the cable? - the speedometer itself? - the connection "at the wheel?" - the connection at the guage? I'm planning to remove all guages this winter and send them out for checking, cleaning, recalibrating as necessary, but I'd really like to get rid of that bouncing needle now if this is something simple. Any ideas?
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...Oliver '73 911T: 2.9ltr w/ PMO EFI |
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10-07-2002, 05:26 AM
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Join Date: Mar 2002
Location: lake havasu city az
Posts: 945
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The cable my 914 did the same thing. I slit the sheath of the sable and oiled it worked better but still needed replaced. I sold the car that fixed that
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65 911/ 301274 sold 66 911 /303509 sold 67 911/ 355032 68 911 softie sold 70 T with s trim |
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10-07-2002, 06:12 AM
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Join Date: Jul 2001
Location: Springfield, MO
Posts: 1,422
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This is just from memory, many years ago.
Dirty gunky grease on your cable is the cause. At lower speeds the cable binds slightly and then jumps when the binding is overcome. This causes the spedo needle to jump. I believe that the cable comes out from the spedo end. Pull out, clean off the old grease, use new graphite type spedo cable grease on the cable and reinsert. You may have to take the end loose at the transmission to reinsert the cable into the drive. Good luck, David Duffield |
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10-07-2002, 06:31 AM
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Join Date: Aug 2002
Location: Chicago
Posts: 114
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Is this the same fix for a bouncing tach?
Periodically when I'm cruising along in 4th (1970 911T) at around 3K RPM, I quickly catch the tach needle shoot up to ~4K RPM then back down to whatever it was originally -- no increase in speed, no sputter, just bounces.
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10-07-2002, 07:14 AM
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Join Date: Sep 2002
Location: Melbourne, Australia
Posts: 28
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Not quite the same I realise, but I have a 1973 Superbug that until recently suffered the same speedo bouncing. It only ever happened at lower speeds, which unfortunately makes up a large percentage of the time when you have 50Hp.
The good news is that having replaced the offending speedo cable, the needle bouncing that annoyed me on a daily basis has completely vanished. |
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10-07-2002, 07:40 AM
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Senior Member
Join Date: Feb 2000
Location: Lacey, WA. USA
Posts: 25,305
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A new speedo cable is the ticket, but there is a device, found in motorcycle shops, that helps force lubricant down into the cable. It clamps on the end of the cable and seals it off so the lubricant is forced into the cable sheath. I recommend using a "dry" wet lube. A lube that has graphite suspended in a fluid that evaporates quickly, so that only the dry graphite is left behind. If you instead use an oily lubricant dirt, time and cool weather will conspire to gum up the cable.
Really, a new cable is the ticket.
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Man of Carbon Fiber (stronger than steel) Mocha 1978 911SC. "Coco" |
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10-07-2002, 07:53 AM
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Phoenix
