GMC 1997 Safari Owner's Manual page 249

I
A
CAUTIOh:
9. Remove any rust
or
dirt
from the wheel bolts,
mounting surfaces and
spare wheel.
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 could 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 towel
to do this; but be sure to use a scraper or wire
brush later, if you need to, to get all the rust or
dirt off.
, -
Never use oil or grease on studs or nuts. If you
do, the nuts might come loose. Your wheel could
fall off, causing a serious accident.
10. Put on the spare tire. Put the nuts on by hand. Make
sure the cone-shaped end is toward the wheel.
Tighten each nut by hand until the wheel is held
against the hub. If a nut can't be turned by hand,
use the extension and see your dealer
as soon
as possible.