ARMY TM 9-6115-604-12
NAVY NAVFAC P-8-633-12
3-15.
MAINTENANCE OF THE ENGINE.
a.
Maintenance of Engine Assembly (see Figure 3-3).
(1) Inspect.
(a) Inspect engine fuel components for leaks or damage in accordance with paragraph 3-12.
(b) Inspect engine cooling system components for leaks or damage in accordance with paragraph 3-13.
(c) Inspect head gasket areas, water transfer tubes, aftercooler, and expansion plugs for evidence of coolant
leakage. See Figure 3-3.
(d) Inspect engine lubricating system components for leaks or damage in accordance with paragraph 3-14.
(e) Inspect follower covers, handhole covers, rocker covers, timing gear covers, and oil pan for evidence of
oil leaks.
(f)
Inspect auxiliary engine equipment for wear or defects that would Interfere with proper engine operation.
(g) Refer defects to the next proper level of maintenance for repair or replacement.
(2) Service. Service the engine assembly in accordance with Table 3-2 and the Lubrication Order contained in
paragraph 3-2.
b.
Air Cleaner Assembly Hoses and Clamps. In addition to the hoses and clamps connecting the air cleaner
assembly to the turbochargers, the air cleaner assembly has a cup assembly, primary element assemblies, safety
element assemblies, and indicator assemblies. Before reaching the primary element assembly, the air must pass
through a tube network consisting of inner and outer tubes. Air enters through the outer tubes In a downward direction,
makes a 180 degree change in direction, and flows up through the inner tubes to the cleaner element chamber. The
centrifugal force created by this abrupt change in air flow direction throws most of the dust out of the Incoming air, and
into the dust collector cup. This centrifugal cleaning action greatly increases the service life of the primary element
assemblies. Indicator assemblies, located on the engine side of the air cleaner assembly, provide a visual signal when
the primary element assemblies require cleaning or replacement.
(1) Inspect.
(a) Visually inspect the overall appearance and condition of the air cleaner assemblies, hoses, and clamps.
All clamps, elbows, and adapters must be securely attached to their respective connections.
(b) Check condition of rubber elbows and adapters. Any defects will be cause for replacement.
(c) Check security of attachments on air cleaner support frame members (1 and 2, Figure 3-20) and security
of air cleaners (3).
(d) Check the Indicator assemblies (4) for an amber or red signal If the amber or red signal is visible, refer to
the next higher level of maintenance for element cleaning or replacement.
(e) Check cup gasket (9) for damage or deterioration.
(2) Service. Service by disposing of collected dust on daily basis or depending on operational environment.
(a) Locate dust cup assembly (6, Figure 3-20) attached at the bottom of each air cleaner body assembly
(b) Unsnap the hinged latch (7) at the base of each dust cup assembly (6) Hinged trap-door cup (8) will
swing downwards to dump contents.
(c) Clean the hinged trapdoor cup (8) with a damp cloth and close. Check cup gasket, if defective, refer to
the next higher level of maintenance for repair. Secure to the bottom of dust cup assembly (6) by
snapping the hinged latch (7) shut.
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