Acura 51401-S3V-A06 Front Coil Spring

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If the struts or coil springs show signs of wear such as leaking fluid, loss of damping capability, or chipped, sagging, or cracked coil springs, it is important to explore all options before starting any work. The strut/shock absorber assemblies cannot be serviced and must be replaced if there is a problem. However, you may be able to find strut assemblies complete with springs on an exchange basis, which can save time and effort. Before disassembling your vehicle, make sure to check the cost and availability of parts. To begin the disassembly process, remove the strut and spring assembly and mount it in a vise, taking care to protect the unit from damage. Use a spring compressor to relieve pressure from the upper spring seat, ensuring that the spring is loose by wiggling it. Hold the strut piston rod with an Allen wrench and unscrew the thrust bearing retaining nut with a box-end wrench. Remove the nut and upper mount, laying out the parts in the order they were removed. Inspect the bearing in the suspension support for smooth operation and replace if necessary. Check the rubber portion of the upper mount for cracking or deterioration and replace if needed. Remove the upper spring seat and upper insulator from the damper shaft, checking for cracking or hardness in the spring seat and replacing if necessary. Carefully lift the compressed spring from the assembly and set it aside. If disassembling both struts, mark the springs as left and right to avoid mixing them up. Remove the dust cover plate and dust cover, then slide off the rubber bump stop and check for deterioration, replacing if needed. To reassemble, extend the damper rod and install the rubber bump stop, dust cover, and dust cover plate. Place the compressed coil spring onto the lower seat of the damper, ensuring the end fits into the recessed portion of the lower seat. Install the upper insulator and spring seat, followed by the bearing and suspension support. Install the washer and nut, tightening it to the specified torque. Remove the spring compressor tool and install the strut/spring assembly.

Loosen the wheel lug nuts, raise the vehicle and support it securely on jack stands. Block the front wheels to prevent the vehicle from rolling. Remove the wheel. On 2007 Acura MDX models, remove the rubber hangers from each side of the muffler. Remove the stabilizer bar link from the lower arm B. Support the lower arm B with a floor jack placed under the coil spring pocket. Remove the ABS wheel speed sensor harness from the lower arm B. Mark the position of the spring to the spring insulators. On 2007 Acura MDX models, remove the lower shock absorber mounting bolt. Remove the bolt securing the lower arm B to the knuckle. Slowly lower the floor jack and remove the coil spring. Check the spring for cracks and chips, replacing the springs as a set if any defects are found. Also check the upper insulator for damage and deterioration, replacing it if necessary. Installation is the reverse of removal, noting the following points: Be sure to position the lower end of the coil spring in the depressed area of the trailing arm. Raise the outer end of lower arm B with a floor jack to simulate normal ride height, then tighten the control arm-to-knuckle bolt to the torque. Tighten the wheel lug nuts to the torque.