Date: Sun, 13 Mar 2005 05:48:31 +0000 (UTC)
From: Craig's C900 Site <c900nospam.apana.org.au>
Subject: Re: Speedo drive


Mac Townsend <mactnonospamadcomgraphics.com> writes: >I'm a new SAAB owner, or rather a new owner of an older SAAB. A 93 900S >16v w/o turbo. >The speedo doesn't work. >is this driven by a cable or is it electronic? Cable, as far as I know. All C900 speedo's are driven the same way. >Any tips on how best to get it operating again? I can get along without >a speedo on my MGBs (a major bitch to get at and repair) because I know >the revs-to-speed in each gear but this unit is different. You need to check a few things. The speedo cable is driven by a special gear setup coming from the transmission, and the cable has a square shaped plastic 'driver' that slides into the 'socket' at the back of the speedo itself to transfer rotational energy the mechanism inside the speedo gauge. It's possible that the gearing to drive the cable inside the transmission has failed, or the cable isn't properly connected at the back of the speedo (the special spring clip may have broken). If you ever get the dash apart and can watch the dash-end of the speedo cable while driving, watch to see if it rotates. If not, the gearing in the transmission is probably faulty or the speedo cable itself has been kinked or somehow has corroded internally. If you see the dash-end rotating, make sure the small square-shaped 'driver' piece is intact and hasn't broken itself. If that's ok, check that the cable was properly attached to the back of the speedo gauge with the special spring clip that secures it. If that is all ok, then the speedo gauge itself is most likely faulty. The gear to drive the odometer might have cracked and got jammed against the worm gear that comes from the speed part of the guage, or something else could have broken internally. I looked into getting speedo's repaired some time last year and it's surprisingly difficult to locate places that repair VDO's mechanical speedo gauges, at least here in Australia. Good luck working out what the problem is though - let us know if we can help some more. Regards, Craig. -- Craig's Saab C900 Page --> http://nospam/~c900 Sydney, NSW Australia Craig's Saab C900 Workshop -- For all Saab C900 Enthusiasts world-wide! http://www.nospam.net http://www.nospam c900nospam.apana.org.au Come and explore our site, and check out our web-forums, mailing list, etc.

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