Mercury 4W7Z-18125-DA Shock Absorber Assembly

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If the vehicle continues to move up and down or fails to return to its original position, a worn or weak shock absorber is likely the reason.

During installation, ensure all air is expelled from a new shock absorber (for 2002 and earlier models), install all bushings and grommets in the order of removal, and use 5116-18 locknuts on the self-tapping bolts if the threads in the lower control arm are stripped or damaged. Tighten all fasteners to the specified torque, with locknuts torqued to the same specification as the bolts.

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 specified torque.

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.

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.

Grasp each front tire at the front and rear edges, push in at the front, pull out at the rear, and feel for play in the steering system components.