speedometer gauge disassemby

[Forden]

My speedometer is buzzing, and I think it's the gauge--I lubed the cable and it's spinning freely. I'm lucky that I have an older instrument set to use to experiment (the original, which I'll remount if I get it working). It looks like the retaining ring around the face of the gauge was press fitted into place by the factory--am I looking at cutting that ring if I want to disassemble the gauge completely?
Thanks all.

 

[allojohn]

Pry the edge of the retaining ring up very slowly and carefully with a sharpened screwdriver (or similar) a little at a time working your way around the ring. Maybe take 3 or 4 passes to fully open. When you're done fixing the clock reverse the procedure to close up.
There's at least a couple of threads on here regarding this process.

 

[tatu]

You might get some joy by squirting a little ACF50 or some lube where the cable fits. you need to get the outside of the bearing not the actual square hole. That works sometimes.

 

[Forden]

Thanks all. I ended up disassembling both the speedos I have (getting that retaining ring pried off is surely an exercise in patience), and lubing from both sides of the spindle with fishing reel oil. a little dab of synthetic grease on the gears as well. the one on the bike loosened up quite a bit, still makes a bit of hissing noise but no repeats of the death rattles and groans I heard before. A couple small shards of black plastic came out of it--I assume they were pieces from a failing bushing that was making the worst noise.

The other (original) one does what it should with a square drill bit spinning it too, so good hopes for getting the original cluster rehabbed and back on the bike.