Pic. 6.31. Ground clearance measurement points. The top point of H5 is in the center of the rear arm silent block
The accuracy of measuring wheel alignment angles directly depends on the ground clearance (pic. 6.31). To determine the ground clearance, the vehicle, located on a horizontal plane, must be unladen, with a full fuel tank and normal tire pressure.
To measure the front ride height, measure and record the H1 value (distance from the center of the wheel axle to the road) and H2 (distance from the subframe to the road) on both sides of the car. Find the difference between these values, the resulting average result will determine the ground clearance.
To measure rear ride height, measure and record H4 (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 car. Subtract H4 from H5 to find the average reference rear ride height.
For a technically sound vehicle, the ground clearance ahead is (95±10,5) mm, back (8±5,0) mm.
The permissible difference between the left and right sides must not exceed 5 mm, and the height on the driver's side must be greater.
Compare the result of the measurements made with the control values of the ride height.
It should be noted that the ground clearance is not adjustable and the measured values outside the set values indicate the need to check the suspension elements.