Chevrolet 30 Series 1967 Service Manual page 335

Cleaning Oil Bath Cleaner
1. At every engine oil change period, remove the air
cleaner assembly.
2. Remove cover and filter element assembly.
3. Empty oil out of cleaner and clean out all oil and ac­
cumulated dirt.
4. Wash body with cleaning solvent and wipe dry.
5. Wash filter element by sloshing up and down in
cleaning solvent.
. Dry filter unit with an air hose or let stand until dry.
6
7. F ill body of cleaner to full mark with SAE 50 engine
oil. If expected temperatures are to be consistently
below freezing, use SAE 20 engine oil.
. Assemble filter and cover assembly to body of
8
cleaner.
9. Install cleaner, making sure it fits tight and is set
down securely.
CHECKING THERMOSTATIC ELEMENT
Before replacing the thermostatic element, check the
operation of the air valve to see that it works freely and
does not bind. Replace any bent or broken air valve
components and before making the following check of the
thermostatic element.
The air valve thermostatic element may be easily
checked for proper operation whenever the cover is re­
moved for regularly scheduled element cleaning. At this
tim e, immerse the cover (far enough to cover the ther­
mostat pellet) in water of less than 80°F.
should remain closed. Gradually raise temperature of
the water. The valve should begin to open at a water
temperature of 83 °F and be fully open at a temperature of
120°F.
Thermostat Replacement
1. Remove sheet metal to air cleaner hose from the air
cleaner cover.
2. Remove the wing nut and cover.
3. Loosen the jam nut and unscrew the thermostatic
element.
4. Screw in a new thermostatic element until it just
bottoms on the push rod (with the valve held closed
by the spring). Immerse cover and element in water
of 83°F for two to three minutes, then screw the ele­
ment in further until the cover air valve just begins
to open. Tighten jam nut. Raise water temperature.
Valve should be fully open at 120°F.
5. Replace the cover and wing nut, and the sheet metal
to air cleaner cover hose.
The valve
Fig. 8A - Thermostatic A ir V a lv e P a llet Replacement
AIR CLEANERS
ENGINE FUEL 6M -11
CHEVROLET TRUCK SERVICE M ANUAL