1993 GMC Jimmy Owner's Manual - Page 260

CAUTION A Rust or dirt on the wheel, or on the parts to which it is ,fastened, can make the wheel nuts become loose after a time. The wheel cuufd come off and cause an accident. When you change a wheel, remove any rust or dirt from the places where the wheel attaches. to the vehicle. In an emergency, you can use a cloth or a paper towet to do .this; but be scare' to use a scraper or. wire brush 'later,it you. need to, to get all the rust or dirt off. i I i I Remove any rust or dirt from thewheel bolts, mounting surfaces or spare wheel. Place the spare on the wheel mounting surface. 5-26