Coil spring compressors require careful setup and even tightening to safely remove suspension springs. Always alternate sides and never use impact tools during compression.
The key to safe suspension work is knowing how to use a coil spring compressor correctly. This guide covers the entire process from vehicle preparation through final release, with emphasis on the alternating-side technique that prevents tool slip and spring recoil. For a comparison of top-rated models, see our roundup of the best coil spring compressors if you need to purchase one.
Preparation and Safety Essentials
Before touching the spring, lift the vehicle corner with a jack and secure it on a jack stand under the frame with the suspension fully drooped. Remove the wheel. If the shock absorber sits inside the spring, remove it first; if outside, disengage the upper or lower attaching bolt. Clean any dirt, grease, or oil from the spring — compressing an oily spring risks slippage. Lubricate the compressor’s center bolt threads with engine oil.
Wear safety glasses and gloves. Keep the spring oriented away from your body throughout the process.
Attaching the Compressor
Insert the compressor through the shock tower or spring seat center. Fit the jaws over the coils closest to the ends of the spring. Use one long jaw and one short jaw on each side to keep the center bolt aligned — never place both short hooks on one side. Position the compressors 180 degrees apart on opposite sides at the same height. For Ford or GM vehicles with curved coil springs, place the long and short arms on the same side to maintain the spring’s curvature.
Compression and Removal
Hand-tighten the center bolt until slight tension exists, ensuring the tool is straight and parallel to the spring. Then use a manual ratchet with the appropriate socket: 15/16″ for standard tools, 21 mm for Macpherson strut compressors, or 1‑1/16 in. (27 mm) for hydraulic strut models. Never use power tools or impact wrenches — they apply pressure too quickly and can cause rod failure or tool slip.
Tighten gradually, alternating sides every 10 turns or in small increments to maintain equal pressure. Compress only enough to clear the spring seat or relieve pressure on the strut end retainer (typically 3–4 inches). Never allow the coils to touch each other. Once compressed, remove the strut end retainer or desired component and carefully take the spring out of the vehicle.
To release, turn the hex nut counter‑clockwise in small increments, alternating sides. Remove the restraint chain and compressor only after zero tension remains. Loosen all four clamps before removing the compressor kit.
FAQs
Can I use an impact wrench to speed up the process?
No. Impact wrenches apply too much pressure too quickly, increasing the risk of rod failure, tool slip, or sudden spring recoil. Always use a manual socket wrench and alternate sides.
What happens if I compress the spring until the coils touch?
Overcompressing until coils touch creates catastrophic potential energy with no safe release path. Stop as soon as tension on the spring seat is relieved (usually 3–4 inches of compression).
Do these instructions apply to all vehicles?
The process works for most Macpherson strut and coil‑spring suspension systems, but Ford and GM vehicles with curved springs require placing the long and short compressor arms on the same side. Always consult your vehicle’s service manual for model‑specific details.
References & Sources
- O’Reilly Auto Parts. Coil Spring Compressor Instructions. Primary step‑by‑step used for this guide.
Mo Maruf
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