Air Cleaners; Oil Bath Type - GMC 4000 Series Service Manual

It is recommended that element be changed initially
at first oil change and thereafter at intervals in­
dicated under "Engine Oil Recommendations."
Location of oil filter is at left rear on gasoline
and diesel models (fig. 6).
ELEMENT TYPE
1. Remove plug in filter shell to drain oil
from filter.
2. Back out center stud and withdraw shell,
element, and stud as an assembly.
3. Remove and discard element.
4. Clean filter shell of old oil or other
deposits.
5. Replace old filter shell gasket in groove of
filter base.
6. Position new filter element in shell, THEN
FILL SHELL WITH OIL.
7. Install shell and element assembly on filter
base, then tighten center stud being careful that
gaskets are not damaged. Torque to 40 to 50 foot­
pounds.
8. Start engine and operate at idle speed for
a few minutes until oil pressure builds up to
normal.
9. Check filter for leaks, then check dipstick
level. Add oil to bring level up to (not above)
dipstick mark.
DISPOSABLE TYPE
1. Turn filter from mounting on engine, then
discard assembly.
2. Thoroughly clean mounting at gasket area.
3. Apply lubricant to filter gasket. Fill ele­
ment shell with engine oil, then thread filter onto
mounting stud until gasket touches mounting, then
tighten filter two-thirds more, which should pro­
vide the required torque of 10 to 15 foot-pounds.
4. Whenever new element is installed, the
engine should be run and the filter inspected for
signs of an oil leak. The engine should then be
stopped, and the oil level brought up to the "FULL"
mark on the oil level dipstick.

AIR CLEANERS

Air cleaners must be serviced a minimum of
every 3,000 m iles, or whenever dirt becomes v is­
ible in the element or oil. Under extreme dirty
conditions inspection may be required daily. Air
cleaners on vehicles operating in dust storm areas
should be cleaned immediately after such storms
occur.
Several types of air cleaners are used. De­
pending upon the vehicle model, each type cleaner
is serviced and mounted in a different manner.
G M C S E R V I C E M A N U A L
Figure 5 — Oil Filler and Dipstick IGasoline and Toro-Flow)
OIL BATH TYPE (Figs. 7 and 9)
ly to the engine or on cab dash. Loosen thumb
screw on top, then separate cover and element
from reservoir.
T H R O W - A W A Y TYPE
W A R N IN G — DIESEL ENGINE
USE E X T R E M E CAUTION TO BE
SURE THAT A LL V O L A T IL E C L E A N IN G
FLUID (GASOLINE, KEROSENE, ETC.)
IS R EM O V ED FROM AIR C L E A N E R AT
T IM E OF CLEANING , UNCONTROLLED
FUEL EN TER IN G THE
C H A M B E R IN THIS MANNER CAN CAUSE
THE ENGINE TO "RU N -A W A Y "
POSSIBLY DESTROY ITSELF ANDCAUSE
INJURY TO PERSONNEL.
Oil bath type air cleaners are mounted direct­
R E P L A C E A B L E E L E M E N T TYPE
Figure 6 — Engine O il Filters
Sec. 0
Page 9
LUBRICATION
COMBUSTION
AND
T-3456