GMC 1986 P-Truck Service Manual page 34

SECTION B — EXPLANATION OF
SCHEDULED MAINTENANCE SERVICES
The services listed in the preceding Maintenance Schedules are
further explained below. After services are completed, fill in the Main­
tenance Record at the end of this booklet. When the following mainte­
nance services are performed, make sure all parts are replaced and
all necessary repairs are done before operating you vehicle. Be sure
to use the proper fluids and lubricants as shown in Section E.
Item No.
1. ENGINE OIL AND OIL FILTER CHANGE
SF/CC or SF/CD QUALITY, ENERGY CONSERVING OILS OF
THE PROPER VISCOSITY Also always change oil and filter as
soon as possible after driving in a dust storm. If following Main­
tenance Schedule 1, change oil and filter every 6 months or
recommended mileage; otherwise, change the oil and filter ev­
ery 12 months or recommended mileage. See your Owner's
Manual for further details.
2. CHASSIS LUBRICATION — Lubricate the front suspension,
steering linkage, constant velocity universal joint, transmission,
clutch, transfer case shift linkage, parking brake cable guides,
propshaft, universal joints, brake pedal springs, and clutch pedal
springs. Lubricate clutch cross shaft every 30,000 miles (50 000
km).
3.
ENGINE IDLE SPEED ADJUSTMENT
cations shown on the underhood label. You must use calibrated
test equipment. Check that idle stop solenoid or dashpot work
properly (if so equipped).
4.
COOLING SYSTEM SERVICE
with new coolant. See your Owner's Manual for further details.
5 AIR CLEANER ELEMENT REPLACEMENT, A.I.R. AND PCV
FILTER REPLACEMENT (SOME MODELS)
specified intervals. Replace more often under dusty conditions.
Ask your dealer for the proper replacement intervals for your
driving conditions.
6. FRONT WHEEL BEARING REPACK
front wheel bearings at each brake relining, or at the specified
interval, whichever comes first.
* An Emission Control Service
12
* — ALWAYS USE
* — Adjust to the specifi­
* — Drain, flush and refill system
* — Replace at
— Clean and repack the
7.
TRANSMISSION SERVICE
Transmission — Change the transmission fluid and
Automatic
filter every 15,000 miles (25 000 km) for vehicles under 8600
GVWR or every 12,000 miles (20 000 km) for vehicles over 8600
GVWR if the vehicle is mainly driven under one or more of these
conditions:
• In heavy city traffic where the outside temperature regularly
reaches 90°F (32°C) or higher.
• In hilly or mountainous terrain.
• Frequent trailer pulling.
• Uses such as taxi, police or delivery service.
If the vehicle is not used mainly under any of these conditions,
change the fluid and filter every 30,000 miles (50 000 km) for
vehicles under 8600 GVWR or every 24,000 miles (40 000 km)
for vehicles over 8600 GVWR. See your Owner's Manual for
further details.
Manual Transmission (S-Truck 4-Speed, 4-Speed O/D, and
5-Speed) — Change transmission fluid at 7,500 miles (12 500
km), then every 30,000 miles (50 000 km).
Manual Transmission (Except S-Truck 4-Speed, 4-Speed O/
— Manual transmission fluid does not require
D, and 5-Speed)
periodic changing.
8. PCV SYSTEM INSPECTION * — Check that PCV (Positive
Crankcase Ventilation) system works properly. Replace the valve
as necessary and any worn, plugged or collapsed hoses.
9. FUEL FILTER REPLACEMENT * —
specified interval or sooner if clogged.
10.
CARBURETOR CHOKE AND HOSES INSPECTION
that choke and vacuum break work properly and within specifi­
cations. Correct any binding caused by damage or gum on the
choke shaft. Inspect hoses for proper hookup, cracks, chafing,
or decay. Correct as necessary.
11.
CARBURETOR OR THROTTLE BODY MOUNTING BOLT
* — Check torque of mounting bolts and/or
TORQUE CHECK
nuts.
12.
VACUUM ADVANCE SYSTEM INSPECTION
the system works properly. Check hoses for proper hookup,
cracks, chafing or decay. Replace parts as needed.
An Emission Control Service
13
Replace the fuel filter at the
* — Verify
* — Check that