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#1 |
Senior Member
Join Date: Apr 2014
Location: Honolulu
Posts: 116
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Aloha,
My speedo is not working anymore, the other day I took a drive and looking down at my speedometer it was going wild, from 0 to 45 (while I was driving at a steady pace, probably around 35mph) and then suddenly stop working. I checked the speedometer with a drill...seemed to be working, check the cable...seemed to be fine, check the speedo gear...seemed to be fine while it looked fairly used. Any ideas what the issues might be, also If I want to get another speedo gear, how many teeth??? I have a 29coupe. I think the transmission is stock. Appreciate the help... as always. |
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#2 |
BANNED
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My last encounter with a speedo going bonkers, the cable got all twisted up and finally gave up due to crud buildup in the cable housing, and this can wipe out the drive gear off the tranny. I would suggest removing the drive gear, clean and lube with new gasket and check the cable with the drill while hooked to the speedo and see if it doesn't do it again.
Also, while you have the drive gear out, check for busted teeth.
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New owner of '28 Tudor Previously owned; '30 Sport Coupe '28 left brake ccPickup '31 SW Town Sedan '28 AA Stake Bed '30 Cabriolet '42 Super Deluxe 4door Sedan "If it don't fit, get a bigger hammer. If it breaks...... ya needed a new one anyway!!" Doing a good job here is like wetting your pants in a dark suit. It gives you a warm feeling, but nobody notices. Never pass up a bathroom Never neglect an erection Never trust a fart |
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#3 |
BANNED
Join Date: May 2010
Location: Bucks County, PA
Posts: 11,454
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DA. I think you mean the driven gear??
With the cable removed check to see if the driven gear moves when put in gear and the rear up on stands |
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#4 |
BANNED
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Oh, both, hook the drill up to the cable and make sure it runs the speedo constant, AND check the drive gear with a wheels up.
__________________
New owner of '28 Tudor Previously owned; '30 Sport Coupe '28 left brake ccPickup '31 SW Town Sedan '28 AA Stake Bed '30 Cabriolet '42 Super Deluxe 4door Sedan "If it don't fit, get a bigger hammer. If it breaks...... ya needed a new one anyway!!" Doing a good job here is like wetting your pants in a dark suit. It gives you a warm feeling, but nobody notices. Never pass up a bathroom Never neglect an erection Never trust a fart |
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#5 |
Senior Member
Join Date: May 2010
Location: Mpls, MN
Posts: 27,582
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Spin the driven gear in the aluminum housing while you slowly lift it into place to check exactly how much mesh the teeth have. You might be driving the cable with just the tips of the teeth due to a wrong housing for the driven gear.
Also be sure the cable is clean and lubed and has no sharp bend of kinks. |
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#6 |
Senior Member
Join Date: Mar 2012
Location: gouverneur n,y,
Posts: 2,762
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Last edited by papanick; 11-30-2016 at 07:53 PM. |
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#7 |
Senior Member
Join Date: Dec 2010
Location: FRESNO, CA
Posts: 12,560
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Be sure to run the drill in reverse & NOT TOO fast.
Bill Backwards
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"THE ASSISTANT GURU OF STUFF" |
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#8 |
Senior Member
Join Date: Jun 2014
Location: Land of Lincoln
Posts: 3,175
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#9 |
Senior Member
Join Date: Apr 2014
Posts: 709
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Pull the inner cable out and check it for damage, especially at each end where it fits in the driving gear and the speedo.
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#10 |
Senior Member
Join Date: Mar 2012
Location: gouverneur n,y,
Posts: 2,762
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You have to check to see if the cable is all the way in the speedometer. If it can move down it will stop working the speedometer.
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#11 |
Senior Member
Join Date: Dec 2010
Location: FRESNO, CA
Posts: 12,560
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Papanick will "cringe"
![]() Without completely disassembling it, I drilled a series of 1/16" holes along its' length & drilled slightly into the shaft, to form "oil pockets" ![]() I FINALLY got it to turn a little, then SLOWLY began to turn it CCW, with the drill & it freed up ![]() Would I do it AGAIN? I don't rightly know??? I surely WOULDN'T take the WHOLE thing apart, to replace the number tape!!! The OLD numbers just gives it a little "PATINA" ![]() I had lost contact with my Friend @ Johnnies' Speedo, here in town. If anyone is in doubt, better send it to Papanick ![]() ![]() I have a "weakness" of wanting to "FIX" everything, once got my arm STUCK in the pipes, under the sink, Pat brought me a PILLOW! GOD, I sure miss her! Bill Fixit
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"THE ASSISTANT GURU OF STUFF" Last edited by BILL WILLIAMSON; 12-01-2016 at 09:37 AM. |
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#12 |
Senior Member
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When the speedo went wild, it can only be due to high friction in the speedo head. It causes the cable to wind up and let go before it breaks, or something that drives the cable breaks. It is usually the cable.
What usually Happens, is the main shaft binds up. Big job getting it out to fix it, but that drilling holes in it sounds great. Can't wait to try it. |
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#13 |
Senior Member
Join Date: Mar 2012
Location: gouverneur n,y,
Posts: 2,762
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Hay I have rebuild a lot of them that has had the holes drilled into them. It works but it puts a lot of oil inside the case. It just coats all the inside parts. Hay but before you do that check the cable good and see if it can move down in the casing.
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