Section 110-0050
Engine - Air Cleaner
4
SM 1668 1-99
Inspection of element on the outside will disclose any
holes where concentrated light shines through. Even
the smallest hole will pass dust to the engine and may
result in costly engine repairs.
9. Install primary element (2) in air cleaner body (1).
10. Install cover assembly (4) on air cleaner body (1)
and secure with latches (5).
Secondary Element
Numbers in parentheses refer to Fig. 1.
Since safety element (3) is protected from
contamination by primary element (2), it needs no
periodic cleaning and should be replaced only after
every third primary element (2) service.
1. With primary element (2) removed from air cleaner
body (1), remove safety element (3).
2. Remove any dust dislodged into air cleaner body (1)
outlet and, using a damp cloth and a suitable solvent,
wipe out all excess dust from air cleaner body (1) and
allow to dry.
3. Install new safety element (3) followed by primary
element (2) in air cleaner body (1)
4. Install cover assembly (4) on air cleaner body (1)
and secure with latches (5).
Recommendations
Numbers in parentheses refer to Fig. 3.
1. Under no condition should the vehicle be operated
without both filter elements in each air cleaner
assembly.
2. It is very important that hump hoses (6 & 7), tube
assembly (1), tube (2) and elbows (8 & 15) from the air
cleaner assembly to the engine be airtight or the
purpose of the air cleaner will be completely defeated.
All clamps (9 & 10) should be checked frequently and
tightened to prevent leaks.
3. Keep new or cleaned filter elements on hand for
replacement to prevent unnecessary downtime of the
vehicle.
MEASURING AIR RESTRICTION
Numbers in parentheses refer to Fig. 3.
As a dry air cleaner element becomes loaded with
dust, the vacuum on the engine side of the air cleaner
(air cleaner outlet) increases. This vacuum is generally
measured as 'restriction in mm (inches) of water'.
The recommended maximum allowable intake
restrictions at rated speed and load are as follows:
a. 380 mm-H
2
O (15 in-H
2
O) with clean filter elements.
b. 635 mm-H
2
O (25 in-H
2
O) with dirty filter elements.
While the air restriction gauge sends a signal to indicate
the need for servicing, it does not give as precise a
measurement as a water manometer or vacuum gauge.
Water Manometer
a. Remove protective cap (11) and disconnect
harness at air restriction gauge (12). Remove air
restriction gauge (12) from elbow (14).
b. Hold water manometer vertically and fill both legs
approximately half full of water. Connect one of the
upper ends to elbow (14) by means of a flexible hose.
c. With the manometer held vertically and the engine
drawing maximum air, the difference in height of the
water columns in the two legs is measured as the air
cleaner restriction.
d. If the restriction exceeds the levels indicated,
engine performance will be affected. Primary filter
element should be cleaned or replaced.
Vacuum Gauge
a. Remove protective cap (11) and disconnect
harness at air restriction gauge (12). Remove air
restriction gauge (12) from elbow (14).
b. Connect the hose from the vacuum gauge to
elbow (14) and, with the engine drawing maximum air,
take a note of the reading on the gauge.
c. If the restriction exceeds the levels indicated, engine
performance will be affected. Primary filter element
should be cleaned or replaced.
SERVICE TOOLS
Refer to Section 300-0070, SERVICE TOOLS for part
numbers of service tools referenced in this section and
general service tools required. These tools are
available from your dealer.
* * * *
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