Mercury 8G1Z-18125-H Shock Absorber Assembly

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If the front suspension shock absorber/coil springs show signs of wear such as leaking fluid, loss of damping capability, sagging or cracked coil springs, they should be disassembled and overhauled as needed. The shock absorbers cannot be serviced and should be replaced if faulty, while the springs and related components can be replaced individually. It is important to replace components on both sides of the vehicle simultaneously to maintain balanced characteristics. Once the assembly is removed from the vehicle, clean off any external dirt without damaging the protective coating on the spring. Install the coil spring compressor tools securely and compress the spring until all tension is relieved from the upper mount. Hold the shock absorber piston rod with a wrench and unscrew the nut, avoiding the use of an impact wrench to prevent damage. Remove the upper mount, spring, boot, bump stop, and lower spring seat. If a new spring is being installed, carefully release the original spring from the compressor. Examine all components for wear and damage, replacing as necessary. Check the shock for fluid leakage, pitting on the piston rod, and damage to the shock body. Test the shock's operation by moving the piston through full and short strokes, ensuring smooth and continuous resistance. Reassemble by installing the lower spring seat, bump stop, and dust boot onto the shock absorber. Then, install the spring and upper mount/upper seat, aligning the arrow or notch on the upper mount with the lower mount. With the spring compressed, install the rod nut and position the ends of the spring within 0.39-inch of the step on both mounts. Tighten the nut to the specified torque while maintaining the position at both ends. Release the tension on the spring and reinstall the spring assembly in the vehicle.

Inspect the shock body for leaking fluid, dents, cracks, and other damage which would warrant replacement. Check the coil spring for chips or cracks in the spring coating and the spring seat for cuts, hardness, and general deterioration. If any undesirable conditions exist, proceed to the shock absorber/coil spring disassembly procedure.

For a driveaxle boot check, focus on inspecting the boots for tears, cracks, and loose clamps, particularly the outer CV boot, and replace them if any evidence of damage or leaking lubricant is found.

Remove the brake caliper and mounting bracket as an assembly, ensuring to support the caliper with a length of wire to avoid hanging by the brake hose. Proceed to remove the upper shock absorber mounting nut and index the spring position on the shock absorber and the upper spring isolator. Raise the floor jack slightly to compress the coil spring and remove the trailing arm-to-rear knuckle bolt. If it's an all-wheel drive model, loosen the trailing arm to subframe bolt, or if it's a front-wheel drive model, remove the trailing arm-to-subframe bolt and remove the arm. Continue by removing the lower arm-to-rear knuckle bolt, and if it's a front-wheel drive model, loosen the lower arm-to-subframe bolt. Slowly lower the floor jack and remove it, followed by removing the shock absorber lower mounting bolt and maneuvering the shock absorber and coil spring out from between the lower arm and the subframe.