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Old 04-07-2002, 12:54 PM
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Join Date: Apr 2002
Location: a space in time
Posts: 132
93 600 sel speedo error

Recently joined the ranks of the faithful with a 93 600 sel (egads). Curiousity lead me to check the speedo/odo combo with gps and mile marks. The odo is accurate to less than a 1% error over 800 km. The speedo is optomistic by a consistant 7 to 8 %. ( 120 km/hr indicated is actually 112/113 km/hr) The questions are : is the speedo electric? , is there an adjustment?, are the odo and speedo fed by different inputs? The present tires are properly sized 235/60/16. I have reviewed many threads/forums, but none have quite answered the questions.

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Old 04-07-2002, 01:13 PM
Join Date: Mar 2000
Location: Gainesville FL
Posts: 6,844
One speed signal for both odo and speedo.

The 140 chassis originally had a mechanical odometer but all replacement inst clusters now have digital odometers. The speedo is adjustable internally on a bench. An input is fed the device to make 60mph (don't know the speed in km) using a signal generator and the signal frequency given by the calibration constant on the back of the instrument, K=xxxx. If you have the right odometer as you say, the speedo just needs recalibration by a speedo shop.
Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician
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Old 04-07-2002, 03:34 PM
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Join Date: Apr 2002
Location: a space in time
Posts: 132
Thank you Steve, for your reply. Is this an adjustment that could be made by a reasonably competent individual with electronic equip at home, (scope, signal generator, etc, etc) or is this a shop only issue ?
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