ARMY TM 9-6115-604-12NAVY NAVFAC P-8-633-12g.If engine does not achieve or run smoothly at rated load, or exhaust smoke is excessive, troubleshoot In accordance withTable 4-3.h.Return engine to no load for a minimum of 3 to 5 minutes, then shut down engine.i.If malfunction cannot be repaired, refer to the next higher level of maintenance.4-76. MAINTENANCE OF AIR FILTER ASSEMBLY (Figure 4-49) PIPES, HOSES, AND CLAMPS. The purpose of theair cleaner assembly is to filter combustion air before entering engine to prolong life of engine.a.Remove.NOTEIf required, remove side panels (refer to paragraph 4-13), ether injection system (refer toparagraph 4-52), and disconnect overhead wiring harness run.(1)Remove hexagon head capscrews (15, 18, and 21, Figure 4-49), lockwashers (17 and 19), hexagonal nuts (16) to remove support channels (20) and air shut off valve support brackets (22).(2)Loosen and remove hose clamps (1 and 3), molded rubber adapters (2, 5, 7, and 8), 6 and 4 Inch tubing sections (6 and 13), and 10 inch tubing (4) to remove aircontrol valve assemblies (52).(3)Remove hexagon head capscrews (9), lockwashers (11), and hexagonal nuts (10) to remove air cleaner tube hanger (12) before removing 58 inch tubing (14).(4)Remove hexagon head capscrews (23) and lockwashers (24) to remove air cleaners (27 and 28).b.Repair. Make sheet metal repairs to the 4, 6, 10, and 58 inch tubing sections (13, 6, 4, and 14), air cleanertubehanger (12), support channels and air shut off valve support brackets (20 and 22).c.Install.(1)Mount replacement air cleaners (27 and 28, Figure 4-49) on right and left hand brackets and secure withhexagon head capscrews (23) and lockwashers (24).(2)Mount air cleaner tube hanger (12) using hexagon head capscrews (9), lockwashers (11), and hexagonal nuts(10), and Install 58 Inch tubing section (14).(3)Install 10 Inch tubing section (4), molded rubber adapters (2, 5, 7, and 8), 6 and 4 inch tubing sections (6 and13), air control valve assembly (52) and 10 Inch tubing section (4) using hose clamps (1 and 3).(4)Mount support channels and air shut off valve support brackets (20 and 22) and secure with hexagon head capscrews (15, 18, and 21), lockwashers (17 and 19), and hexagonal nuts (16).d. ReplaceAirCleanerElements. See Figure 4-49. Cleaner elements should be replaced or serviced only when the service Indicators are in the amber or red positions.(1)Remove.(a) Loosen the coupling clamp (44, figure 4-49) and remove the cup assembly (48) and preformed packing (45) and gaskets (46 and 47) Discard the preformed packing and gaskets.(b) Remove the nut (29), gasket (30), and primary element assembly (35). Discard the gasket.NOTEDo not remove the safety filter element unless the safety signal indicator shows red. The safetysignal indicator is built into the nut assembly (33).(c) If the safety signal indictor shows red, remove the clip(31), pin (32), nut assembly (33), gasket (30), andsafety element assembly (34). Discard the gasket and safety element assembly.(d) If the safety element assembly (34) has been left In place, cover it with a clean, plastic bag to protect it from contamination.4-138
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