Chevrolet 30 Series 1967 Service Manual page 333

Element Replacement
1. Remove air cleaner cover.
2. Remove element and on two element air cleaners re­
move polyurethane band from paper element.
3. Remove bottom section of air cleaner and remove
and discard air cleaner gasket.
4. Clean bottom section of air cleaner and air cleaner
cover thoroughly.
NOTE: Check seal on bottom of air cleaner
for tears or cracks.
5. Install bottom section of air cleaner with a new air
cleaner gasket.
. Install new paper element on bottom section of air
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cleaner with either end up. On two element air
cleaners, install cleaned polyurethane band over
paper element before installing paper element.
7. Install air cleaner cover.
Fig. 3A - O il Bath A ir C leaner
CONVENTIONAL CAB
MAINTENANCE PROCEDURES
Refer to Figure 1A.
Fig . 4A - Carburetor Heat Stove
Testing Paper Element
Tool J-7825, is designed to check paper element air
cleaners to determine whether the element has materially
decreased in efficiency and should be replaced or has
only slightly increased air restriction and is suitable for
further service. In combination with a tachometer, this
instrument will quickly and accurately determine the air
cleaner element condition.
NOTE: Before testing, inspect for holes or
breaks in the element, as these defects require
immediate replacement. If no holes or breaks
exist, proceed as follows:
1. Remove all hoses and plug all openings except air
cleaner inlet.
2. Install air cleaner (without polyurethane band on two
element air cleaner), using Tool J-7825 in place of
the wing nut. Screw Tool J-7825 onto the stud until
it seals tightly against the air cleaner cover. Rotate
the entire tool so that the scale can be read from the
left side of the truck. Be sure the vent hole is to­
ward the dash (fig. 5A).
3. Connect a tachometer and place it so that it may be
read simultaneously with Tool J-7825 (fig. 5A).
4. Zero oil level in the inner tube by pulling inner tube
upward until the rubber seal is above the vent hole,
then raise or lower as required until the inner tube
oil level is exactly to the "
5. Start engine. If engine is cold, allow to run for 2 to
3 minues. The choke must be fully open.
. Accelerate the engine slowly until the inner tube oil
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level of Tool J-7825 just reaches the 1/4 mark. Al­
low engine speed to stabilize and note tachometer
(rpm) reading. Decelerate engine.
7. If the tachometer reading is at or below the follow­
ENGINE FUEL 6M-9
" mark.
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CHEVROLET TRUCK SERVICE MANUAL