What Is This Dashboard Sound??

[jplace1011]

Hi Everyone,

I’ve been hearing a rubbing/clicking sound from the speedometer area of my dash (CUCV M1009).

The speedometer cable was replaced in December of last year along with the plastic gear with teeth and it’s housing (I don’t remover the name of that part).

You can watch and listen to a couple of videos I shot of it here:

Could it be the cable is bad, the speedometer is whacked, etc.?

Any ideas what it is? Thank you in advance.


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[cucvrus]

Disconnect the speedometer cable at the tail shaft of the transfer and take a drive does the sound still exist? Now hook it back up to the tail shaft again and go for a ride. Any sound? If not the Speedometer head unit is bad and they are easy to come by. Good Luck. Report back. It is just a process of elimination. Is the vacuum pump making slight contact with the firewall? Check things out.

 

[jplace1011]

Disconnect the speedometer cable at the tail shaft of the transfer and take a drive does the sound still exist? Now hook it back up to the tail shaft again and go for a ride. Any sound? If not the Speedometer head unit is bad and they are easy to come by. Good Luck. Report back. It is just a process of elimination. Is the vacuum pump making slight contact with the firewall? Check things out.

This is great advice! Thank You CUCVRUS! I’ll give you an update.


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[jplace1011]

Disconnect the speedometer cable at the tail shaft of the transfer and take a drive does the sound still exist? Now hook it back up to the tail shaft again and go for a ride. Any sound? If not the Speedometer head unit is bad and they are easy to come by. Good Luck. Report back. It is just a process of elimination. Is the vacuum pump making slight contact with the firewall? Check things out.

Hi CUCVRUS! I got a chance to look under the M1009 today. I just want to double check, I unscrew this end of the speedometer cable near the transfer case right? Then listen for noise, then screw it back it and listen again.

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[jplace1011]

Hi CUCVRUS! I got a chance to look under the M1009 today. I just want to double check, I unscrew this end of the speedometer cable near the transfer case right? Then listen for noise, then screw it back it and listen again.

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p.s. the vacuum pump is Not making contact with the firewall. At least now I know where it’s at!


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[jplace1011]

Hi CUCVRUS! I got a chance to look under the M1009 today. I just want to double check, I unscrew this end of the speedometer cable near the transfer case right? Then listen for noise, then screw it back it and listen again.

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Hello Again @CUCVRUS! I disconnected the speedometer cable and heard nothing. I hooked it back up and still heard nothing. I’m assuming it’s a bad speedometer head as you mentioned. I ordered a new one from LMC Truck.

Let’s see if that does it and I’ll give an update later.

Thank you!


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[jplace1011]

Disconnect the speedometer cable at the tail shaft of the transfer and take a drive does the sound still exist? Now hook it back up to the tail shaft again and go for a ride. Any sound? If not the Speedometer head unit is bad and they are easy to come by. Good Luck. Report back. It is just a process of elimination. Is the vacuum pump making slight contact with the firewall? Check things out.

Hello Again @CUCVRUS! I disconnected the speedometer cable and heard nothing. I hooked it back up and still heard nothing. I’m assuming it’s a bad speedometer head as you mentioned. I ordered a new one from LMC Truck.

Let’s see if that does it and I’ll give an update later.

Thank you!


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[Keith_J]

A healthy dab of regular axle grease will fix it. Stuff it into the cable housing and snap it back onto the speedometer.
The bushing is dry. The cable has a bit of torsional spring to it so it forms a resonant pair.

 

[jplace1011]

A healthy dab of regular axle grease will fix it. Stuff it into the cable housing and snap it back onto the speedometer.
The bushing is dry. The cable has a bit of torsional spring to it so it forms a resonant pair.

Hey Keith J, thanks for the info buddy. I will tray that! Good looking out. I’ll let you know what happens.


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[cucvrus]

Another thing you can do is pull the cable out of the tubing and grease the entire length of the cable with cable and chain lubricant. They make speedo cable lube also. But you can pull it out from the topside and replace it the same way. Good Luck.

 

[Keith_J]

This is the area needing grease. The rotating magnet is connected to the brass hub which engages the cable. The magnet rotates, inducing eddy currents in the cup attached to the speedometer needle. The faster the magnet turns, the greater the torque on the cup.
When the bushing runs dry, it causes rotary oscillations making the noise plus needle vibrations.

 

[jplace1011]

This is the area needing grease. The rotating magnet is connected to the brass hub which engages the cable. The magnet rotates, inducing eddy currents in the cup attached to the speedometer needle. The faster the magnet turns, the greater the torque on the cup.
When the bushing runs dry, it causes rotary oscillations making the noise plus needle vibrations. View attachment 836827

This is an awesome and a very helpful photo. Thank you for the help, I appreciate it. I love this Forum!


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[jplace1011]

Disconnect the speedometer cable at the tail shaft of the transfer and take a drive does the sound still exist? Now hook it back up to the tail shaft again and go for a ride. Any sound? If not the Speedometer head unit is bad and they are easy to come by. Good Luck. Report back. It is just a process of elimination. Is the vacuum pump making slight contact with the firewall? Check things out.

The Speedometer has now stopped working. I haven’t gotten around the lubing the bushing on the back of it yet. I disconnected and reconnected the cable from the transfer case side and it worked at first and now it doesn’t. I also noticed the part that the cable goes into (pics below) is a bit loose, I can wiggle it easily. Is there a certain way to put the cable in, etc.? Maybe it’s suppose to be like that? Maybe not

Any ideas?

*The cable was replaced late last year.

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[cucvrus]

Remove the adapter assembly from the speedometer cable and the transfer case. Does the gear spin inside the adapter. Now check your transfer case oil. Is it full or nearly full? Has the nylon gear on the transfer case been chewed off? Using a 10mm wrench remove the speedometer gear housing and look inside. You should see a nice clean nylon gear on the shaft and the housing should also have a nice clean nylon gear. Check it out and report back. Can you spin the cable going up to the speedometer head? Does the speedometer react? You need a helper to tell you if you get a response. Good Luck. Report back.

 

[jplace1011]

Remove the adapter assembly from the speedometer cable and the transfer case. Does the gear spin inside the adapter. Now check your transfer case oil. Is it full or nearly full? Has the nylon gear on the transfer case been chewed off? Using a 10mm wrench remove the speedometer gear housing and look inside. You should see a nice clean nylon gear on the shaft and the housing should also have a nice clean nylon gear. Check it out and report back. Can you spin the cable going up to the speedometer head? Does the speedometer react? You need a helper to tell you if you get a response. Good Luck. Report back.

I forgot to mention, the 41 Driven Speedometer Gear was replaced at the end of the last along with the speedometer.

When I turned the end of the Speedo cable the speedometer in the dash did react.

Two things I noticed while I was down there. It wasn’t super easy to get the end of the speedometer cable into the adapter assembly. I will take it off and inspect the gear as you recommended. I’m already suspicious of the gear inside the adapter.

The other thing I noticed was blue markings the mechanic placed on the round piece (with numbers) on the transfer case. Is it still ok to take things apart as you said? I just want to make sure he didn’t align something before I take more things a part.

I had to go buy a 30mm socket to check the transfer case fluid level it was too dark by the time I got back, but I’ll check tomorrow.

Thank you for all of your help!


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[cucvrus]

The other thing I noticed was blue markings the mechanic placed on the round piece (with numbers) on the transfer case. Is it still ok to take things apart as you said? I just want to make sure he didn’t align something before I take more things a part.

Take that 10mm hex head off and remove that assembly. Not sure what the marks are for. Pull it out and inspect it. Put it back after you inspect everything and just line the marks up. Put a little oil on the O ring so it goes back in smoothly. Good Luck.

 

[jplace1011]

The other thing I noticed was blue markings the mechanic placed on the round piece (with numbers) on the transfer case. Is it still ok to take things apart as you said? I just want to make sure he didn’t align something before I take more things a part.

Take that 10mm hex head off and remove that assembly. Not sure what the marks are for. Pull it out and inspect it. Put it back after you inspect everything and just line the marks up. Put a little oil on the O ring so it goes back in smoothly. Good Luck.

I checked the fluid in the Transfer Case, it was good.

I took the adapter piece off and I didn’t see much of a gear. The end in the pic below.

On the other side of the adapter, I could could see what looks like the middle piece of a gear, it had some oil on it. I was able to spin the piece around that look last like the end of a speedometer cable. Pic below

I then took the yellow gear out, it seems to be great. It’s the one replaced at the end of last year. I lined up the blue lines when I installed it. Pic Below

On a side note is there supposed to be a gasket in between the end of the speedometer cable and the adapter? I read this in the TM Pic Below

The Adapter seems to be a bit loose, I mentioned this before. I don’t know if that’s how it’s suppose to be or matters at all?

Here’s a very quick video of that:

Maybe I need to Replace the Adapter? Any ideas?

Thank you again, you’ve been very helpful.


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[cucvrus]

Does the adapter spin when spun? Does the cable fit securely into the adapter? Can you spin the adapter when it is attached to the speedometer cable? Does the speedometer react? Place the gear housing onto the adapter. Does the gear spin freely with minimum resistance? Does the cable and speedometer react? Check inside the tail shaft of the transfer case. Is the gear on the shaft good? No stripped gears? Check all this out. It is just a process of elimination. Good Luck.

 

[jplace1011]

Does the adapter spin when spun? Does the cable fit securely into the adapter? Can you spin the adapter when it is attached to the speedometer cable? Does the speedometer react? Place the gear housing onto the adapter. Does the gear spin freely with minimum resistance? Does the cable and speedometer react? Check inside the tail shaft of the transfer case. Is the gear on the shaft good? No stripped gears? Check all this out. It is just a process of elimination. Good Luck.

Hello! I don’t have my tools, so I haven’t been able to take things apart again. I should be back at it this weekend or early next week. One thing I do know is that the cable doesn’t go into the adapter very easily. I’ve had to very slowly spin the cable in to make it fit.


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[cucvrus]

Hello! I don’t have my tools, so I haven’t been able to take things apart again. I should be back at it this weekend or early next week. One thing I do know is that the cable doesn’t go into the adapter very easily. I’ve had to very slowly spin the cable in to make it fit.


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Problem solved. Under speed can you imagine the stress and wobble in that cable. Either the cable is worn / stripped and the square ends are worn off or the adapter has the worn out insert. I think you found the problem. I knew you could do it. Good Luck. Report back on your findings.