TM 5-4310-275-14
WARNING
(5) Install rupture disc (3) into cylinder cap
(4) with the red side of the disc toward the
Dry cleaning solvent, Fed. Spec. P-D-680
retainer end of the cap. Place disc retainer (3),
or P-S-661, used to clean parts is
chamfered edge toward the rupture disc, into the
potentially dangerous to personnel and
cylinder cap. Install disc retainer ring (1) and
property. Avoid repeated and prolonged
tighten to 60 to 90 inch-pounds (.6915 to 1.0511
skin contact. Do not use near open flame
kgm) torque.
or excessive heat. Flash point of solvent
(6) Install exhaust valve (6) and valve spring
is 100" F. (38 C. ) -- 138 F. (59" C.).
(5) into the cylinder.
b. Cleaning and Inspection.
(7) Screw the cylinder cap (4) into the
(1) Clean all parts with dry cleaning solvent,
cylinder and tighten to 300 inch-pounds (3.4851
.
Fed. Spec. P-D-680.
kgm) torque,
(2) Inspect all parts for obvious indication of
lubricating
Federal
oil,
(8) Apply
damage, such as damaged threads, scratched,
Specification MIL-L-6085A, to the threads of.
pitted, or worn finished surfaces, and broken
reducer bushing (14), elbow (7), seal (13), gasket
cooling fins.
(10, fig. 7-3), nut (8) and preformed packing (9).
(3) Inspect the cylinder bore, piston
(9) Install nut (8), preformed packing (9) and
a s s e m b l y , piston pin, c o n n e c t i n g link and
gasket (10) onto the elbow and install the elbow
bearings for excessive wear, scoring and other
assembly into the cylinder.
damage.
(10) Install seal (13) onto reducer (14) and
(4) Refer to Table 5-2 for wear tolerances.
screw the reducer into the cylinder.
c. Reassembly.
(11 ) Connect the intercooler assemblies (fig.
(1) Place twenty-five needle bearings (15,
7-1).
(12) Connect the aftercooler assembly (fig. 7-
pin hole in the connecting link. Place one washer
1).
(16) over each end of the bearings. Carefully slide
7-9. Crankcase Assembly, Disassembly and
piston assembly (19), and scribe a small mark on
Reassembly
the inside surface of the pie ton assembly toward
a. Disassembly.
the fan end of the crankcase, over the connecting
(1) Remove the fan assembly (para 7-3).
link and press piston pin (18) through the piston,
(2) Remove drain plug (24, fig. 7-4) and
washers, bearings, and connecting link. Secure
preformed packing (23). Allow all lubricant to
the piston pin with cotter pin (17).
drain from oil reservoir (25).
(3) Unscrew and remove sight gage (27) and
NOTE
preformed packing (26).
Assembly of the needle bearings and washers into
the connecting link can be facilitated by applying
(4) Remove six nuts (36), endbell (35) and
a coat of Petrolatum, Federal Specification VV-P-
gasket (39) from the crankcase.
236.
(5) Remove the sems fasteners (22) and pull
oil, reservoir (25) from the crankcase. The oil
(2) Place gasket (21, fig. 7-3) between two
pump piston will slide out of the pump cylinder.
gaskets (20) and position the gaskets onto the
(6) Remove screws (19), oil pump cylinder
crankcase mounting flange.
(18), and cylinder retainer (20) from the oil
(3) Carefully slide cylinder and sleeve (11)
reservoir.
over the piston assembly and attach to the crank-
(7) Remove pin (21) and separate the
case with nuts (12). Tighten the nuts with equal
cylinder from the retainer.
torque.
(8) Unscrew piston retainer (17) from the
(4) Use a depth micrometer or dial indicator
master connecting rod assembly. Remove shim
to measure piston-head-to-valve-seat clearance.
(16), piston (15), ball (14), rod socket (13), and
Required clearance is 0.002 to 0.006 inch (.0050 to
ball retainer (12).
.0152 cm). If necessary, remove cylinder and add
(9) Remove the first stage piston, second
or remove cylinder-to-crankcase gaskets to obtain
stage piston, and third stage piston (refer to
required clearance.
NOTE
(10) Pull crankshaft (42, fig. 7-4), oil seal
Overall thickness of steel gaskets can be reduced
(40), and bearing (41 ) out of the crankcase (1).
in increments of 0.002 inch (.0050 cm) by peeling
(11 ) Remove thrust washer (43), bearing
off laminations. At least one paper gasket must
(47), and oil seal (48) from the crankcase (1).
remain on each side of steel gasket in final
installation.
