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10-27-2017, 08:27 PM | #1 |
Member
Join Date: Jan 2014
Location: Johannesburg, South Africa
Posts: 61
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Screaming Speedometer
Hi Boffins
My speedometer has developed a scream like a model airplane engine has been started inside my car. I disconnected the cable from the speedo and the noise has stopped. I took the speedo out and took off its cover but can see nothing visibly wrong. Any ideas on what is causing this awful noise? I desperatly want my speedo working again, and noiselessly. Thanks a bunch. |
10-27-2017, 08:33 PM | #2 |
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Join Date: Oct 2015
Location: Virginia
Posts: 409
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Re: Screaming Speedometer
You can connect a drill to the speedometer where the cable goes in and spin it in the forward direction to see if the noise is the unit. If not it is the cable doing something strange.
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10-27-2017, 08:36 PM | #3 |
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Join Date: Jun 2014
Location: Melbourne, Australia
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Re: Screaming Speedometer
Over the years, the lubricant used in these speedos at the time of manufacture has dried out. A little wear will also have happened, causing a shaft to rattle in its bush. I quietened one of my speedos by using a little penetrating oil sparingly at the right places. I figured it would find its way into the bearing and soften the old grease. Whether my thinking was right or wrong, I can now hear the other noises. Concentrate on the components driving the spinning magnet.
I'm not an expert on these instruments like others here so I too will be interested in the replies you get.
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10-27-2017, 08:55 PM | #4 |
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Join Date: Aug 2012
Location: Takoma Park, MD
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Re: Screaming Speedometer
It's almost Hallowe'en, remember.
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10-27-2017, 09:10 PM | #5 |
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Join Date: Jun 2011
Location: West Point, VA 23181
Posts: 373
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Re: Screaming Speedometer
What syncro 909 says:
Mine screamed too, till I added a few drops of oil to the input shaft. Good luck! Roger. |
10-27-2017, 09:44 PM | #6 |
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Location: Syracuse,NY
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Re: Screaming Speedometer
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Tried cable lube-no help. I replaced the speedo cable, & cable housing. No more noise. Try the above or try another speedo unit. Loubob |
10-28-2017, 12:12 AM | #7 |
Member
Join Date: Jan 2014
Location: Johannesburg, South Africa
Posts: 61
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Re: Screaming Speedometer
Hi Loubob. I have already replaced the cable, and the noise continues. The speedo is original and in outwardly superb condition and both the odo and the speedo work fine so am loathe to replace it until I have exhausted all other avenues.
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10-28-2017, 12:13 AM | #8 |
Member
Join Date: Jan 2014
Location: Johannesburg, South Africa
Posts: 61
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Re: Screaming Speedometer
Hi Roger
Thanks - is the input shaft the place where the cable goes in? Or do I have to take the speedo apart? |
10-28-2017, 12:45 AM | #9 |
Member
Join Date: Jan 2014
Location: Johannesburg, South Africa
Posts: 61
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Re: Screaming Speedometer
Heh heh!
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10-28-2017, 06:27 AM | #10 |
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Join Date: May 2010
Location: Mpls, MN
Posts: 27,582
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Re: Screaming Speedometer
I'd take the speedometer apart just enough to oil each shaft gear and bushing. Remove the oval cover and clean out the old hard grease and add some oil and grease. I did mine over 20 years ago, and it's still working fine. You don't need to take it down as far as the 4th picture. That one just shows a speedometer I bought with a broken shaft.
I need to get my old computer out to find my pictures, as these are too small to be much good. |
10-28-2017, 08:36 AM | #11 |
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Join Date: Mar 2012
Location: gouverneur n,y,
Posts: 2,755
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Re: Screaming Speedometer
Hay the bushing get dry over the years and the speedometer needs to be serviced. Let me know if I can help. [email protected]
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10-28-2017, 08:43 PM | #12 |
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Join Date: Jun 2011
Location: West Point, VA 23181
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Re: Screaming Speedometer
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10-29-2017, 06:24 AM | #13 |
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Join Date: Dec 2010
Location: FRESNO, CA
Posts: 12,560
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Re: Screaming Speedometer
Inside my speedo, the pot metal had swelled & seized the vertical bronze shaft. I drilled some 1/16" holes in the pot metal, oiled it, spun it CCW, slowly with a drill motor & it finally freed up.
If you can't find a LOCAL speedo repair shop, call a local Truck Repair Shop for recommendations.--SAME thing, when lookin' for GOOD Radiator Shops. Bill Hopethishelps
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