Hi people,
Whilst on my adventure across Spain a couple of weeks back I had a strange thing happen to my instrument cluster: riding steadily at about 60mph in top and without warning, the tacho needle went wild and lodged itself against the speedo needle pivot point. At the next stop I took it apart and released the needle. Next day it happened again; this time I dis'd the cable and, after a time riding, the vibration caused the needle to release and drop back at rest.
Later that day, the speedo did the same!
I've taken it apart again this morning, released the speedo needle, inspected the hairsprings - which appear to return both needles perfectly - and tested both instruments with a drill. All's well. There are no kinks in either cable; I've monitored the rotational habits of each one and they appear to be stable. To add to the conundrum, the odometer has always racked up without error and in a uniform manner. Needle-ss (sorry) to say, both pointers' paint has needed touching-in.
My main Q is: has anyone else out there in h305land experienced a similar occurence? I'm holding my breath for a reply, remedy or idea that my tiny (but logical) mind might have missed here.......
Regards to all,
Steve
CB-series contra-sweep speedo/tacho problems
Re: CB-series contra-sweep speedo/tacho problemsOften when the cable is dry this happens.
Put some white grease on them and see if it helps. Don't use heavy grease because it gets sort of hard in cold weather where the white doesn't. ..........lm
Thanks Ed. The speedo cable is lubed enough to drop out unaided when dis'd at the drive, and enough to make my nicely electronics-conditioned hands mucky putting it back. I haven't checked the tacho cable yet. I'll try your remedy when I've finished my tinkering next week and I'm in a position to run-up & road test.
I'm not sure what lube you use but white grease lubes hot or cold and the cable won't drop out as yours does. .....................lm
I have Timken Multi-Purpose grease or RS silicon grease (which doesn't noticably change viscosity with temperature) which I think I might try.
Last edited by e3steve on Sun Mar 23, 2008 12:51 pm, edited 1 time in total.
That sounds a good one, although the logical physicist in me says that silicon grease would provide a controlled 'damping' effect of the cable's rotation. I know it should be pretty stable and proportionally linear anyway, but it would enhance the oil-damped pivot system already within the instrument itself.
The other thing I thought might be causing the pointers to behave like demented windscreen wipers is: if the square shaft receiver in each instrument (brass, I think) is slightly rounded, then this would cause the steel cables' squared ends to slip & catch erratically. That would invoke such needle behaviour as I experienced. That's the next thing I'll inspect during the coming week when time permits. I've not pulled the tacho cable off the drive yet as, like I first reported, the rotation of both cables under riding conditions appeared to be stable - even when impeded by pinching 'twixt thumb & forefinger. The possiblity of the speedo cable drive end being thus is impossible due to the design of the coupling. Laters..... (London slang) PS: where's Aussie-Rob's opinion? Wombat200? Ya out there?
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