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1984 Saab 900 speedometer problem

575 Views 10 Replies 7 Participants Last post by  1976SaabEMS
My speedometer stopped working, or rather it worked intermittently and now has stopped altogether. The last time it worked was after I hit a big bump on the road and it abruptly came back for a couple hundred miles but stopped again. I disconnected the speedometer cable and lubed it and tried to spray some lube in the back of the speedometer as well. It worked for a while and has stopped again. The cable itself seems to be fine as the odometer is working correctly. Does anyone have an idea what's going on? I know with the odometer there is a gear that slides out of mesh with another gear and that's what seems like going here as well, but I don't know the inner workings of the speedometer. Taking it out seems to be a big pain in the butt, so I didn't want to take it out unless there is an easy fix or at least one I can do myself. Otherwise, I'll live with no speedometer, like on most of the Alfa Romeos I have!
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In the meanwhile, you could use a GPS speedometer just to be on the safe side.

Speedo cables can be pull and lube them and everything looks okeydokey but once reinstalled they fail like before mostly due to a snag somewhere inside which only happens when the cable is in its old position again. And after 39 years, the drive gear can simply be worn out so it's probably the best solution to replace them both.
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