Mercury 5U2Z-18V125-C Kit - Shock Absorber

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Check the shock absorbers to ensure they are securely mounted and undamaged. Inspect the upper mounts for damage and wear. If damage or wear is observed, replace the shock absorbers as a set (front or rear).

To remove the rear shock absorbers, start by raising the rear of the vehicle and supporting it securely on jackstands. For older models with automatic leveling rear suspension and coil springs (not air springs), allow the rear axle to hang freely until the shock absorbers finish venting through the compressor. Support the rear axle with a floor jack to prevent it from dropping when the shock absorbers are disconnected. If you're dealing with air-assisted shock absorbers, detach the air line by depressing the retainer ring(s) and pulling the lines free. Locate the upper retaining nut for the shock absorber on top of the frame, and to remove it, you may need to hold the piston rod with a wrench or locking pliers while loosening the nut. Remove the upper nut, washer, and insulator from the stud on the upper side of the frame. Compress the shock absorber to clear the hole in the frame and remove the inner insulator and washer from the upper retaining stud. Some models have shocks with a plastic dust tube, which can be loosened using a wrench. Remove the lower retaining nut and the lower shock absorber mounting stud from the mounting bracket to complete the removal process. For installation, ensure that all air is expelled from the new shock absorber by extending and compressing it several times before placing the inner washer and rubber insulator on the shock piston rod. Insert the rod through the upper mounting hole in the frame, attach the outer insulator, washer, and a new stud retaining nut on the upper side of the frame, making sure the insulator "pilots" engage properly in the frame attaching holes. Tighten the nut to the specified torque. Extend the shock absorber, insert the lower shock stud through the hole in the bracket on the axle tube, install a new self-locking retaining nut, and tighten it to the torque. If the vehicle has an air suspension, turn the air suspension switch to On, start the engine, and let the compressor inflate the air suspension springs before driving. Finally, lower the vehicle by removing the jackstands.

Note the order of installation for any bushings and grommets above and below the upper control arm. Inspect these parts for cracks, tears, and deterioration, replacing them as necessary.

The steering linkage and suspension components should be checked periodically as worn or damaged components can lead to excessive tire wear, poor ride quality, reduced fuel economy, and compromised vehicle handling. To check the shock absorbers, park the vehicle on level ground, turn off the engine, and set the parking brake. Push down at each corner of the vehicle and observe if it stops moving and returns to a level position within one or two bounces. If the vehicle continues to move or fails to return to its original position, it may indicate worn or weak shock absorbers. Raise the vehicle and inspect the shock absorbers for fluid leakage, ensuring that any fluid noted is from the shocks and not from another source. Replace the shocks as a set if leakage is present. Additionally, check the shock absorbers for secure mounting and any signs of damage. For the steering and suspension check, visually inspect the components for damage, leaks, and worn seals, boots, and fittings. Clean the lower end of the steering knuckle and have an assistant move the wheel in and out while checking for movement at the steering knuckle-to-control arm balljoint. If there is any movement, the suspension balljoint(s) should be replaced. Grasp each front tire at the front and rear edges, push in at the front and pull out at the rear to feel for play in the steering system components. If any play is noted, check the steering gear mounts and tie-rod ends for looseness. Finally, check the steering gear mount bolt tightness and if the tie-rods are loose, the balljoints may be worn.

The two bolts that attach the lower end of the shock absorber to the lower control arm need to be removed.

The floor jack should be placed under the lower control arm and raised slightly.

Park the vehicle on level ground, turn off the engine, and set the parking brake. Check tire pressures. Push down at one corner of the vehicle, then release it while noting the movement of the body. It should stop moving and come to rest in a level position within one or two bounces.

Depress the retainer ring(s) and pull the air lines free.

Remove the jackstands and lower the vehicle. Before driving a vehicle equipped with air suspension, turn on the air suspension switch, start the engine, and allow the compressor to inflate the air suspension springs.

If any components of the assembly are worn or damaged, have the unit serviced by a qualified repair shop, or replace it with a rebuilt or new unit.