GMC 4000 Series Service Manual page 25

Sec. 1
Page 18
GENERAL MAINTENANCE
on key shank and the code number is stamped on the
knock-out portion of the key head. These numbers
identify the locks in which the keys are used and
are required when ordering or making new keys.
Notch depth information on current production
keys will be provided upon request through the
manufacturer of your key cutting equipment or
his locksmith association. Also, he will be able to
furnish a conversion package for your cutter, if
required, for grinding new keys.
EXTERIOR MAINTENANCE
Entire vehicle should be regularly inspected
for condition of paint and for corrosion damage,
with particular attention given to chrome. Inspec­
tion should be made more frequently in freezing
weather due to the corrosive effect of road deicing
materials (salt, calcium chloride, etc.) on metal.
If inspection discloses any evidences of corrosion,
paint failure, or bare metal, corrective measures
as outlined under "Painting" (later in this section)
should be immediately employed.
Body painted surfaces and chrome plating
should be protected by a coating of wax, applied
at regular intervals. Periods between applications
should be sufficiently short to assure continuous
protection of the finish; 30 days after delivery, and
at least once a year thereafter. Any good body wax
can be used for both painted and chrome surfaces.
Wax should be applied immediately after vehicle
has been cleaned.
NOTE: Calcium chloride and other salts, road
tar, excretion from insects ("tree sap"), chemicals
from factory chimneys and other foreign matter
may permanently damage paint and chrome. Fre­
quent, regular washing and a thorough cleaning
after exposure is recommended to prevent damage
by these substances.
INTERIOR MAINTENANCE
Care of the upholstery is a relatively simple
but important matter. Accumulation of dirt on the
surface eventually turns into a hard, gritty, sub­
stance which cuts into the surface of the upholstery.
VINYL COATED CLOTH
To clean the seats, use lukewarm, not hot or
cold water, and any mild soap or liquid household
detergent. Work up thin suds on a piece of cheese­
cloth and rub upholstery briskly. Remove suds with
a damp cheesecloth, using no soap, and finish by
wiping lightly with a dry soft cloth. Do not use
furniture polishes, oils, varnishes, or ammonia.
As required, stubborn stains may be removed with
common foaming-type upholstery cleaner prepared
for use on vinyl cloth.
G M C S E R V I C E M A N U A L
WOVEN NYLON FABRIC
of soap, is not recommended for cleaning flat
cloths, particularly broadcloths.
and soil.
ing solution, wring out thoroughly, open cloth and
allow medium evaporation.
tions prepared specifically for use on nylon fabrics.
DO NOT USE bleaches, reducing agents, acetone,
lacquer thinners, enamel reducers, nail polish re­
mover, gasoline, or cleaning solvents which con­
tain dyes or caustic agents. Use of these solvents
tends to weaken and change color of fabric.
gently - DO NOT RUB. This will pick up particles
which are too embedded to be removed in the brush­
ing operation. This operation should be repeated
several tim es - in each instance using a clean
area of cloth.
fluid; some interior trim assem blies are padded
with rubber and volatile cleaners are generally
solvents for rubber. The application of too much
cleaner may destroy these rubber pads or cause
the rubber itself to penetrate the upholstery fabric
and spoil appearance.
evaporation until barely damp, then apply to both
the soiled and the area surrounding same, using a
light swabbing motion.
area of the assembly which is being cleaned should
be thoroughly brushed and gone over lightly with
the solvent.
FLOOR AND SIDE PANELS
or vacuuming. Using mild soap and water sparing­
ly, sponge clean side panels and floor. Repeat clean­
ing operation with clean damp sponge or towel to
remove soap film and allow to dry thoroughly.
solvents are not recommended since damage to
interior finishes and upholstery could result.
ing for leaks by spraying water under pressure
against cab while assistant inside cab marks
points of leakage, if any exist.
around glass, dry surface and apply rubber cement.
Apply cement to outside, both between glass and
weatherstrip and between weatherstrip and body.
Soap and toater, regardless of the basic type
1. Carefully brush all loose particles of dirt
2. Immerse small cloth in volatile type clean­
IMPORTANT: Use only volatile cleaning solu­
3. Place cloth on soiled spot and blot area
IMPORTANT: DO NOT use too much cleaning
4. Immerse second cloth, wring out, and allow
5. Repeat brushing operation.
6. If a cleaning ring should form, the entire
Floor should be cleared of debris by sweeping
Pressure spray cleaning and use of strong
DUST A N D WATER LEAKS
Test windshield, windows, and cab underfloor­
If location of leak has been determined to be