Hello All
My 1985 300td's speedometer jumps all around when I first starting rolling cold until I get up to about 10MPH - after which it works perfectly. After it begins working well it doesn't jump anymore even below 10MPH.

I'm hoping this is a lubrication problem with the cable.

My question is: What is the best way to lubricate it? Should I disconnect it at the cluster and drip oil on the end? Or should I disconnect it at the trans and withdraw the cable from the housing and put oil or grease on it?

Thanks, Joseph

W123 cables are a sealed unit; you can't pull the cable out of the housing.

In the past, I've used 90w gear oil. Insert it at the top of cable and wait. It's a slow process for the oil to run down the length of the cable. This is a TEMPORARY fix only. Eventually the cable will break. (The last time I replaced mine, I found the dealer's price of an OE slightly less than an on-line aftermarket part).

__________________

Don't Chrome them; polish them

Hi
Thanks for the response and info. I didn't know about it being a sealed unit.
Joseph

That is a sign the cable is getting dry - the next stage is you'll hear a loud Buzz!
I have always used ATF, it works like magic. Fill the small cup that surrounds the cable connection to the gauge and blow it into the cable with your mouth. Wait for bubbles to come out and repeat 2 or 3 times. It's a permanent fix.

SAE 90W is a very heavy oil that will not penetrate and will thicken even more in cold weather giving problems.

__________________
Beagle

Thanks, I'll give it a shot!