Fig. 6.31. Ground clearance measurement points. The upper point H5 is located in the center of the rear arm silent block
The accuracy of wheel alignment angles directly depends on the ground clearance (Fig. 6.31). To determine the ground clearance, the vehicle must be unloaded, on a horizontal plane, with a full fuel tank and normal air pressure in the tires.
To measure the front ground clearance, measure and record the H1 value (distance from the center of the wheel axle to the road) and H2 (distance from subframe to road) on both sides of the car. Find the difference between these values, the resulting average will determine the ground clearance.
To measure rear ground clearance, measure and record the H4 value (from the center of the wheel axle to the road) and H5 (from the center of the rear arm silent block to the road) on both sides of the vehicle. Subtract H4 from H5 to find the average rear ground clearance reference dimension.
For a technically sound vehicle, the ground clearance in front is (95±10.5) mm, in the rear – (8±5.0) mm.
The permissible difference in values between the left and right sides should not exceed 5 mm, with the height on the driver's side being greater.
Compare the results of the measurements with the control values of ground clearance.
It should be noted that the ground clearance is not adjustable and if the measured values go beyond the set values, it is necessary to check the suspension components.
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