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Joined: Dec 2004
Posts: 173 Likes: 1
Shade Tree Mechanic
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OP
Shade Tree Mechanic
Joined: Dec 2004
Posts: 173 Likes: 1 |
Recently I was driving my '37, going about 55 - 60 mph when the speedo needle started to fluctuate, rapidly jumping up to 100mph then dropping back to 55 - 60. Did this several times and then stayed pegged at 100 with a lot of noise. I disconnected the speedo cable and the noise stopped indicating to me that the problem is in the speedo itself. Any suggestions on cause and repair will be appreciated.
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Joined: Jan 2006
Posts: 7,046 Likes: 107
Hall Monitor ChatMaster - 7,000
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Hall Monitor ChatMaster - 7,000
Joined: Jan 2006
Posts: 7,046 Likes: 107 |
There are several shops that repair speedos advertising in Hemmings Motor News. I would strongly recommend asking around locally to see if there's a shop close by before sending the speedo off. Sending it off means several days shipping both ways plus the time it's being rebuilt. All to be repeated if there's something wrong with it when you get it back and have to send it again. (like I did  )
VCCA Member 43216
Save a life, adopt a senior shelter pet.
1938 HB Business Coupe
1953 210 Sedan
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Joined: Nov 2001
Posts: 19,758 Likes: 64
ChatMaster - 15,000
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ChatMaster - 15,000
Joined: Nov 2001
Posts: 19,758 Likes: 64 |
Try a short shot of WD-40 into the bottom of the speedometer. It sometimes adds a bit of lubricant to the bottom bushing. Also while the cable is off pull the inside cable from the housing and lubricate the bottom 2/3 with a light grease (I use chassis grease even though many will tell you not to use it), then replace it before hooking back up to speedometer. If that does not solve your problem it is best to take it to someone with experience. I repair my own
How Sweet the roar of a Chevy four!
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Joined: Jan 2002
Posts: 30,701 Likes: 141
ChatMaster - 25,000
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ChatMaster - 25,000
Joined: Jan 2002
Posts: 30,701 Likes: 141 |
I have cured this problem on one of my cars by unscrewing the cup nut on the back of the speedometer, holding the nut tight against the end of the cable, filling it with light oil, and threading it back on. This must have lubricated the outter bushing. On another car this didn't help so had the speedometer professionally repaired as it was difficult to remove and wanted to be sure it was "fixed".
Gene Schneider
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Joined: Dec 2004
Posts: 173 Likes: 1
Shade Tree Mechanic
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OP
Shade Tree Mechanic
Joined: Dec 2004
Posts: 173 Likes: 1 |
I removed the speedometer from behind the dash and found that there is a oil port on the drivers side of the speedometer to lube the input shaft. I don't know if this is specific to just the '37 speedometer or not. This oil hole is fitted with a felt wick and a brass cover to prevent dust contamination. I oiled the shaft and reinstalled and so far it seems to be working ok. Thanks to all for the advice.
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