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40 series trucks, particularly in the colder climates, have a tendency to develop an annoying problem with the odometer and speedometer. The former stops working - usually the 1/10 dial would turn but the kms wouldn't - and the latter would sometimes jump with the odometer tried to turn. Here's what I did to fix mine:
It was a bit surprising to find that I could easily have reset my odo to 0! I did an initial test on my by setting it to 204998 and using a robertson (squarehead) screwdriver bit in a drill to run it up to 205k. Worked fine. Now with almost 5k km real travel on it, it hasn't stuck at all.
- Remove the dash cluster, and the speedo from the cluster (you don't actually have to unbolt the other gauges if you remove all the screws).
- Remove the speedo needle (pulls off) and face plate.
- Just above and to the right of the odometer numbers is a small metal pin. Pull this out, and the odo can be removed from the plastic cage.
- Remove the small e-clip at the left end of the odometer. (Of course mine went flying, but luckily I had one that worked, so be careful when removing it!)
- Remove and stack all the number rings and the gear mechanisms between them.
- Clean the metal rod thoroughly (mine was quite sticky, which is what I think caused the odo not to function properly). Also clean the inside of each number ring. Lube the rod.
- Reassemble. I put my black number rings on in reverse order. Be careful that you get the numbers lined up evenly.