CLUTCH
GEARBOX
DRIVESHAFTS
169
SPEEDOMETER ALL TYPES
An E.E.C. decree of 25 June 1976, regulates the speed displayed by the speedmeter in relation to the actual speed travelled.
This decree stipulates :
-The speed indicated by a speedometer must never be lower than the actual vehicle speed.
- Between the speed displayed «SD» and the speed travelled «ST», there must always be the following relationship :
VR < VL < 1.10 VR + 4 Km/h
Example : For an actual speed of 100 Kph the speed displayed by the speedometer may be between 100 and 114 Kph.
The speed indicated by the speedometer may be influenced by :
- The speedometer.
- The tyres fitted to the vehicle.
- The final drive ratio.
- The speedometer drive ratio.
Any of these components can be checked without removing them from the vehicle. (See information note N° 78-85 TT of 19 October 1978).
NOTE : Before replacing the speedometer, check the conformity of the following points :
- The tyres fitted to the vehicle.
- The gearbox final drive ratio.
- The speedometer drive ratio.
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