Air Cleaners - Chevrolet 10 1971 Series Chassis Service Manual

satisfactory condition. If the seals leak exces­
sively they should be replaced.
c. When the spinner parts are reassembled, they
should be wiped with a rag saturated with light oil
to provide slight, but not excessive lubrication.
3. If actuator or tubing trouble is indicated:
a. Remove the vacuum tube at the actuator, run the
engine at about 3000 rpm and place a finger over
the end of the actuator. If there is no change in
engine operation, probably the actuator is at fault.
A significant change in engine rpm would indicate
tube leakage and tube should be replaced.
b. If the tubing is not defective, check the actuator
for leakage. With the orifices " stopped up" with
General Description ............................................................................... 6M-17
Maintenance Procedures .....................................................................6M-18
Element Replacement ................................................ ....................6M-18
Air cleaners on all models operate primarily to re­
move dust and dirt from air before it is drawn into the
carburetor and engine. The air cleaner also helps to
reduce engine noise and quenches any flame that may be
caused by engine backfiring through the carburetor.
Two types of air cleaners are used on trucks. They
are the oil wetted paper element air cleaner, and the oil
BOTTOM
ELEMENT
Fig. 1A— Paper Element A ir Cleaner

AIR CLEANERS

INDEX
Page
Inspecting Paper Element
Cleaning Oil Bath Cleaner
GENERAL DESCRIPTION
bath air cleaner.
The oil wetted paper element air cleaner (fig. 1A) con­
sists of an accordian pleated oiled paper filter supported
by wire mesh with a plastisol seal on both top and bottom.
The oil bath air cleaner (fig. 2A) utilizes an oil sump
in the air cleaner bottom and a fibre element.
Air temperature is automatically controlled by a ther­
mostatic valve which selects warmed air from the heat
stove and/or cooler air from the engine compartment or
from outside the vehicle.
COVER
the fingers, or other means, no leakage should
occur. Also check for proper seal of diaphragm
cover and condition of diaphragm itself. Vacuum
in the governor housing can be checked by re­
moving the connection to the distributor and at­
taching a vacuum line. If there is no vacuum
reading check the diaphragm for holes and be
sure the vacuum passage is clear.
c. If no leakage is found, clean all of the component
parts.
d. If tampering is suspected, visually check parts
with the governing parts of an engine that is gov­
erning properly.
..............................................................6M-18
..............................................................6M-18
Fig. 2 A — O il Bath A ir Cleaner
ENGINE FUEL 6M-17
Page
10-30 CHEVROLET TRUCK SERVICE MANUAL