Title: Air Suspension Compressor Rebuild - Part 1 of 7
Owner: Don B , added Feb 20 2014 14:11:09
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2464x2006 227kb(If the image has failed to load, click on it to view large version) Description: The “single piston high pressure air supply compressor pump” that pressurizes the X350 air suspension develops 15 bar / 218 psi. It is made in Germany by Wabco (pronounced VAHB-co in Germany and WAAB-co in the U.S.). The same unit is used by Audi, BMW, GM, Land Rover, Mercedes, Porsche and VW.
2600x2171 231kb(If the image has failed to load, click on it to view large version) Description: The most common failure is lack of compression due to a worn piston ring (or “piston seal”). Jaguar calls for replacement of the entire compressor, but Andy Fulton of Scotland now manufactures new piston rings and sells them at a fair price (bagpipingandy.com). Replacement is easy.
2900x2477 229kb(If the image has failed to load, click on it to view large version) Description: To replace the piston ring on the X350 the compressor must be removed from the car. Raise and safely support the vehicle. Read the cautions in the manual about battery re-connection, then disconnect the battery negative terminal. When working under any vehicle, proper eye protection is mandatory.
2460x2786 231kb(If the image has failed to load, click on it to view large version) Description: The compressor is mounted in the left front wheel arch behind the bumper beam assembly. For access, remove the Radiator Splash Shield. Depending on the model year, it may also be necessary (or convenient) to remove the Air Deflector/engine splash shield.
3432x2875 209kb(If the image has failed to load, click on it to view large version) Description: Remove the fasteners at the forward edge of the wheel arch splash shield or fender liner (just one Torx screw and one nut on our ’04). Gently pull the liner toward the tire and out of your way.
2300x2375 227kb(If the image has failed to load, click on it to view large version) Description: The compressor is now revealed. Disconnect the electrical connectors at the fog lamp (blue arrow), compressor motor (red arrow), and exhaust valve (green arrow).
3200x2161 235kb(If the image has failed to load, click on it to view large version) Description: Before depressurizing the system, confirm your safety glasses are on. To protect the brass air outlet hose fitting, use a 10mm flare nut wrench if available. Loosen the fitting about 1/4 turn until air begins to escape. When all pressure has been relieved, remove the fitting from the compressor.
1975x3698 229kb(If the image has failed to load, click on it to view large version) Description: The inlet hose to the air filter is secured by a spring-type hose clamp. I used a small pair of Channel-lock pliers (“water pump pliers”) to squeeze the prongs of the clamp and slide it down the hose. Then I carefully worked the hose off the air filter fitting.
2311x2588 231kb(If the image has failed to load, click on it to view large version) Description: With the electrical connectors and hoses disconnected, the compressor mounts can be unfastened. Work on the left mount first: remove the nut, shoulder spacer (T-washer), and spring (green arrow), taking care not to drop the small parts. Now work on the right mounts (red arrows).
2425x3408 233kb(If the image has failed to load, click on it to view large version) Description: Remove one bracket nut, rotate the end of the lower bracket away from the stud, and thread the nut back onto the stud a few turns so it will hold the weight of the compressor. Repeat for the other end of the lower bracket. The compressor will now be held by the upper bracket only.
2536x2480 192kb(If the image has failed to load, click on it to view large version) Description: While supporting the compressor with one hand, use the other hand to remove one nut, T-washer and spring. Set the parts aside. Now remove the parts on the other stud and set those parts aside. The compressor is now free to be carefully lowered around the fog lamp and other obstructions.
2800x2363 227kb(If the image has failed to load, click on it to view large version) Description: With the compressor removed, the support cradle and mounting studs are visible. Inspect for rust or other issues you may want to address before reinstalling the compressor.
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