Wheels, tires, suspension alignment 91~ Carrera (996) · General procedure for wheel alignment

Wheels, tires, suspension alignment 91~ Carrera (996) General procedure for wheel alignment Carry out suspension alignment with an optical or electronic wheel alignment tester. The measurement procedures should be taken from the operating instructions for the wheel alignment tester involved. In order to exclude erroneous measurements, the following preconditions must be met before alignment and the following points should be given special attention: Empty weight of vehicle in accordance with DIN 70020, i.e. car ready for the road, with full fuel tank, spare wheel and tools. Ball-jointand wheel-bearingplay in order (wheel-bearingplay cannot be adjusted), Tyre pressurein accordancewith regulations,fairlyuniformtyre tread. Quick-clampingholder with adapter (for the measured-valuepickups) correctly secured to the wheels. Receiving surfaces for the quick-clampingholder on the wheels and the adapter surfaces must be clean and flat. Always check the levelling surface on the wheels precisely in particular be~!orefitting the quick-clampingholders. Strictly comply with maintenanceintervals for measuring equipmentand measuringplatfor~. If the levelling of the measuring platform or of the measuringarea is done in-house,levelling equipmentis required. A hose level is inadequate. Skilled handling of measuring equipmentand measuring platform, Sliding plates with transverse motion (rotary motion) at the rear axle are advisable. Observethe Technical Literature of PAG,the manufacturer of the measuring equipmentand the manufacturer of the measuring platform. Do not treat measured values as a whole, but very critically in regard to driving dynamics, high-speed strength of the tyres, tyre wear and cosVbenefit effects (time required for correction of inslubstantial deviations),The toe values are of decisive significancefor driving dynamics and tyre wear. If the vehicle is measured front and rear, check and adjust the wheel alignment values at the rear axle first. Camber values at the front axle apply for the stra~ht-aheadposition of the whe~ls. Steering whee! and steering gear in centre position when toe is being adjusted. Before wheel alignmentvalues are adjusted at front and rear axles, it is recommendedthat the vehicle height be checked at the DIN empty weight. Conclusionscan then be drawn about wheel al~gnmentvalues in the event of any suspension alignmentthat becomes necessarylater. 44 -12 44 Suspension alignment, complete 996449 Printed in Germany -34, 1999