Replacing the Speedometer Cable

L1030105 On the trip to the 2005 Compout at Parts Obsolete I hit some road debris. At the next gas stop, I noticed that the speedometer was not working.

I stopped in Eugene to see fellow 912 owner Jaems Thomsen and to meet his mechanic, Walt, who jacked up the car and said that the speedometer take-off on the transmission was twisted. He disconnected the takeoff and pulled the end of the cable out of the sheath. The twisted takeoff had kinked the sheath near the end of the cable which caused the cable to break.
IMG_6387 The cable is pulled out the back of the car because the diameter of the connector at the front is much smaller than at the rear. The cable is screwed to the speedometer, feeds through a hole in the trunk, behind the wooden plate at the driver's feet, through the tunnel and out the back to the take-off on the transmission.

Remove both ends of the cable, the seat, the carpet over the tunel, the gearshift, emergency brake handle, and the rear access cover. I like to remove the steering wheel as well which is easy with the Momo wheel.

Feed the speedo cable from the rear tunnel access hole. You can see the old speedometer cable with the ridges on it looping over the right hand heater cables. The cable will hang up along the way but it is easy to free until the end gets to the area of the shift lever.
L1030096 There are two bent metal clips that hold the cable to the side of the tunnel. One is shown here with access under the transmission shift lever and the other under the emergency brake handle.

I was able to feed the cable out the back of the car from the access panel to the first clip under the transmission shift linkage.

Then the clip by the shift lever is opened up, the cable moved to the emergency brake and that clip opened and the cable was worked the rest of the way to the back.
L1030097 Here the old cable is coming out of the car.

You can see the kink in the sheath that caused the cable to break.
L1030115 Here you can see that the new cable is longer than the old one. The extra length is accommodated in the trunk.

The Porsche cable is also available, but it has some extra padding around the sheath and is significantly more difficult to install.
L1030116 I wrapped some masking tape around the end of the cable so I would not have to fight the ferrule as the cable was fed into the back. A new boot was also installed on the cable end before installation. The boot inner diameter is smaller than the attachment nut and would be very difficult to install later.
L1030120 Here is the speedometer cable feeding from the tunnel to the hole in the trunk.
L1030122 Once the cable is in the trunk, we can attach the rear end to the transmission take-off, install the boot, adjust the position in the foot well, remove the masking tape and connect the cable to the speedometer. There is a grommet with a diagonal hole that holds the cable in the hole though the trunk and seals the hole. I got a new one of these grommets but reused the old one. The new one is too large for the hole.

Now you can replace the gear shift, emergency brake handle, foot board, access panel, carpet and seats, put the car back on it's feet and go for a test drive to see how well you did.
Last modified: Sun, 10 Jul 2005


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