1998 mark 8 was lowering overnight and while driving. We took it to Ford, they replaced the compresser, it still lowered overnight. I called back and the service writer said that the car will lower overnight to make entry easier. Do all 98 mark 8's do this?
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You need to test all cylinders to get an idea what the range is. A compression test only shows if one or more is lower than the highest and that would be acceptable to a point of say 20 percent or more.
REMOVE REAR SEAT AND PACKAGE SHELF TO GAIN ACCESS TO THE UPPER SHOCK ATTACHING NUTS.REMOVE UPPER ATTACHING NUTS. RAISE VECHICLE REMOVE REAR WHEEL AND SUPPORT THE LOWER CONTROL ARM WITH A JACK REMOVE LOWER SHOCK ABSORBER MOUNTING BOLT. REMOVE SHOCK ABSORBER ASSEMBLY FROM THE VECHICLE. COMPRESS THE COIL SPRING WITH THE PROPER SPRING COMPRESSOR TOOL. REMOVE CENTER RETAINING NUT HOLDING THE UPPER MOUNTING INSULATOR. SLOWLY DECOMPRESS THE COIL SPRING.REMOVE THE MOUNTING INSULATOR AND THE COIL SPRING. REMOVE THE COIL SPRING. TO INSTALL COMPRESSED COIL SPRING ONTO THE STRUT ASSEMBLY. BE SURE TO THE END OF THE SPRING IS IN THE NOTCH ON THE LOWER SEAT.INSTALL UPPER MOUNTING INSULATOR. YOU WILL NEW LOCKNUT FOR THE CENTER RETAINING NUT OF THE COIL SPRING. CENTER RETAINING NUT AND TORQUE THE NUT TO 13 TO 17 FT LBS. SLOWLY REMOVE THE SPRING COMPRESSOR TOOL. INSTALL SHOCK ABSORBER ASSEMBLY IN THE VECHICLE AND INSTALL THE MOUNTING FASTERNERS AND TORQUE LOWER MOUNTING BOLTS TO 72 - 87 FT LBS. INSTALL WHEEL.LOWER VECHICLE. WARNING COIL SPRING UNDER EXTREME LOADS WHEN COMPRESSED.BESURE TO PROPERLY ALIGN THE SPRING WITH THE COMPRESSING TOOL TO PREVENT PERSONAL INJURY FROM THE SPRING RELEASING UNEXPECTEDLY.
line up exterior mark on crankshaft pulley & observe for compression at TDC. remove drive belt/s and any accessory in way, remove 2 10mm nuts retaining cover at top (may have special bolt/stud begin to turn also, clamp if you can), remove crank pulley, remove lower bolts, support engine with jack remove upper engine mount remove timing cover, replace belt check alignment marks rotate 2 revolutions to TDC again & recheck marks, recheck bet tension, tighten adjuster nutsand reassemble
You're not supposed to replace the uppers on a 98 ranger. They're not meant to be pressed out because its built in with the control arm as a single unit. Just buy new upper control arms and save yourself the trouble. Ford also claims you have to replace the control arm for the lowers as well, but that's BS. They can be replaced fairly easily with the proper tools.