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If I had to guess, I'd bet that one of the teeth on the odometer drive gear might have sheared off a little bit, maybe not enough to totally cause the odometer to stop turning, but enough to hang it up from time to time.
Tapping it with your thumb might jostle it enough to make contact with the drive gear and keep it working.
As I'm sure you've heard, the most important thing you can do to extend the life of the odometer on this (and every other model of Volvo going back to the 544) is to not reset the trip meter while the car is in motion. The drive gear is not synchronized with the odometer gear, and it can cause damage when it reengages.
While having a working odometer isn't a necessity, it is nice to have. My 544 came to me with a broken odometer. I will always wonder how many miles she really has on her.
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http://dylans544.blogspot.com
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