Genuine 1986 Chevrolet Caprice Rack And Pinion

1986 Chevrolet Caprice Parts Questions & Experts Answers

• Q: How is the rack and pinion adjusted and maintained to address issues of lost motion, slackness, and vibration on 1986 Chevrolet Caprice?

  A: The Rack And Pinion is typically filled with lubricant for life, and unless a severe leak occurs that requires a complete overhaul, refilling will not be necessary. To address issues of lost motion, slackness, and vibration attributed to the Rack And Pinion, begin by disconnecting the ground cable from the battery. Next, remove the nut from the Pitman arm and mark its position relative to the Pitman shaft before using a suitable extractor to remove the arm. Loosen the adjuster plug locknut on the Rack And Pinion and unscrew the adjuster plug one quarter-turn. Remove the horn button or shroud from the steering wheel, then turn the wheel to full lock in one direction and back through half a turn. Apply a 3/4 inch socket to the steering wheel center nut and check the bearing drag with a torque wrench or spring balance as the wheel is turned through a 90° arc; this drag represents the thrust bearing preload, which should meet specified standards. Adjust the plug until the correct preload is achieved, then torque-tighten the locknut. A jerky or lumpy sensation while turning the steering wheel indicates worn or damaged bearings. Gently turn the wheel from one stop to the other, counting the number of turns from lock-to-lock, then turn the wheel exactly half that number to center the Rack And Pinion. Loosen the lash adjuster screw locknut and turn the screw clockwise to eliminate lash between the ball nut and the Pitman shaft sector teeth, then tighten the locknut to the specified torque. Check the over-center preload by taking the highest torque reading as the wheel moves through its centered position; it should exceed the torque specified earlier. Adjust the lash adjuster screw position if necessary, then reinstall the Pitman arm and horn shroud, and reconnect the battery ground cable.