Coil Springs: Removal
WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 1990 GMC Suburban, 1990 GMC Pickup, 1990 GMC Cab & Chassis, 1990 Chevrolet Suburban, and 1990 Chevrolet Pickup. However, it is still accessible from the selected car via links, so may be relevant.
- Raise and support vehicle under frame with control arms hanging free. Remove wheel and tire assembly. Disconnect shock absorber and stabilizer bar at lower control arm. Install Lower Control Arm Shaft Support (J-23028-01
) on a jack. Position assembly under lower control arm so that shaft seats in grooves of lower control arm shaft support. See Fig 1
.WARNING: Lower Control Arm Shaft Support (J-23028-01
) must be securely bolted to jack and safety chain must be installed through lower control arm and coil spring to prevent personal injury. - If air bags are installed in coil springs, remove valve cap and valve core. Pry on air cylinder to release air pressure. Reinstall valve core and valve cap to retain vacuum condition. Push air cylinder upward as far as possible. Install safety chain around coil spring and through lower control arm.
- Raise jack to release tension from lower control arm shaft. Remove control arm shaft-to-crossmember "U" bolts. Carefully lower jack until all tension is released from coil spring. Remove safety chain and coil spring. Remove air cylinder.
- Air cylinder should be checked for leaks. Inflate air cylinder to 20 psi (1.4 kg/cm2 ). Submerge in water and check for air bubbles. Replace air cylinder if leaks exist.