question to thrust washer for speedo drive worm gear SF2 hub

Gerald

Gerald

Hero member
I'm trying to resolve an issue with my speedometer drive. The drive cable had sheared off at the bottom last year and I ordered a replacement from Wolfgang, which works as it should, however a whining noise appears once I go faster than 60km/h. I disconnected the cable from the drive and hooked it up to an electric drill which revs up the speedo to 130km/h with no whining noises. Took the front wheel out and cleaned the drive of all grease, worm drive and gear are in good condition, however I noticed that only one thrust washer was fitted to the bottom of the worm drive. Washer measures 6x12x1mm, but seems a bit thin to shim top and bottom of the worm drive in the correct position. Does anybody know the correct thickness of the washer?

Regards,
Gerald
 
There should be a washer both sides of the worm - the thickness will be where the worm will spin freely with a tiny amount of free up & down clearance. - Not sure this will be source of whining though - regards - Phil
 
Phil, yes a washer on both sides of the worm. Problem with whining noise started last year and had stopped for a brief period when I replaced the speedo cable. Any thoughts what else could cause the noise?

Regards,
Gerald
 
Is the whine coming from the drive gear or the cable?
Have you lubed the cable too?
 
The cable is lubed and it appears that the noise originates from the speedo drive, hence the question to the thickness of the washer.

Regards,
Gerald
 
I think Guzzi use the same size washer in their speedo and tacho drives in their 850 and 1000 thought Id mention this in case it helps you to source/borrow an extra washer?
 
I have the information now, the washers are 6x12x1mm and I have sourced some more. Will report back once I've sorted out what causes the whining noise.

Regards,
Gerald
 
Took the 3CL out for 160 k's in the AM and the noise is gone. Second washer seems to have done the trick :)

Gerald
 
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