ARMY TM 9-6115-604-12
NAVY NAVFAC P-8-633-12
Remove any protective covering or plugs used in the upper body.
If removed, install the safety element assembly (34), gasket (30), and nut assembly (33). Tighten the
nut to a maximum of 10 pound-feet (13.6 newton-meters), back off the nut assembly as necessary, and
install the pin (32).
Install the clip (31), primary element assembly (35), gasket (30), and nut (29). Tighten the nut securely.
Install the preformed packing (45), gaskets (46 and 47), cup assembly (48), and secure with the coupling
4-77. REPLACE AIR RESTRICTION INDICATOR. Air restriction Indicators Indicate if air filters are restricted. Replace
a defective air restriction indicator as follows (see Figure 4-49).
Unscrew service Indicator assembly (26) on air cleaners (27 and 28).
Install replacement service indicator (26) in elbow (25) on air cleaners (27 and 28) and tighten securely.
Service indicator should be positioned so that indicator is readable from side of unit It is
4-78. MAINTENANCE OF AIR CONTROL VALVE ASSEMBLY. See Figure 3-21. The air control valve assemblies
block air from entering the engine when an overspeed or emergency shutdown condition occurs.
Disconnect electrical connections from 24 V solenoids L2A and L2B (15, Figure 4-50) and remove cushion
clamp on bracket (12).
Loosen hose clamps (3, Figure 4-49) and remove molded rubber adapters (7 and 8) from air control valve
Remove hexagon head capscrews (15, 18, and 21), lockwashers (17 and 19), and hexagonal nuts (16), and
remove support channels and air shut off support brackets (20 and 22).
Remove air control valve assembly (52).
Place protective covers over turbocharger and air inlet tube openings.
Repair air control valve In accordance with step b, below.
(a) Remove the air control valve (1, Figure 4-50) In accordance with step a, above.
(b) Remove capscrews (7), lockwashers (8), and remove air shutdown bracket (12) and 24 V solenoids L2A
and L2B (15) from air shutdown housing (31).
(c) Remove roll pin (14), and throttle block (13), then remove air shutdown shaft (16), air shutdown spring (17),
and washer (18) from 24 V solenoids L2A and L2B (15).
(d) Remove screws (9), nuts (10), clamp (11), and remove 24 V solenoids L2A and L2B (15) from air shutdown
(e) Remove capscrews (2), lockwashers (3), washers (4), air shutdown cover (6), and air shutdown gasket (5).
(f) Remove roll pin (20) and air shutdown lever (21).
(g) Remove roll pin dowel (28) and air shutdown shaft (30) out of air shutdown housing (31) to remove air
shutdown valve (29), plain washer (27), air shutdown spring (26), and preformed packing (25). Discard