TM 5-4310-275-14
(5) Install rupture disc (41, fig. 7-3) into
WARNING
cylinder cap (42 ), with the red side of the disc
Dry cleaning solvent, Fed. Spec. P-D-680
toward the retainer end of the cap. Place disc
or P-S-661, used to clean parts is
retainer ring (40 ), chamfered edge toward the
potentially dangerous to personnel and
rupture disc, into the cylinder cap. Install disc
property. Avoid repeated and prolonged
hold down screw (39) and tighten to 60 to 90 inch-
skin contact. Do not use near open flame
pounds (.6915 to 1.0511 kgm) torque,
or excessive heat. Flash point of solvent
(6) Install exhaust valve (35), valve spring
is 100 F. (38 C.) -- 138 F. (59 C.).
(36), and washer (37) into the cylinder.
b. Cleaning and Inspection.
(7) Place preformed packing (38) into the
(1) Clean all parts with dry cleaning solvent,
groove in the cylinder cap. Screw the cylinder cap
Fed. Spec. P-D-680.
into the cylinder and tighten to 300 inch-pounds
(2) Inspect all parts for obvious indication of
(3.4576 kgm) torque.
damage, such as damaged screw threads,
lubricating
oil,
Federal
(8) Apply
scratched, pitted or worn finished surfaces, and
Specification MI-L-L-6085A, to the threads of
broken cooling fins.
relief valve (29), seal (32), and preformed packing
(3) Inspect the cylinder bore, piston
(31).
assembly, piston pin, connecting link and bearing
(9) Install nut (30), preformed packing (31)
for excessive wear, scoring and other damage.
and seal (32 ) onto the relief valve and install the
(4) Refer to Table 5-2 for wear tolerances.
relief valve assembly into the cylinder.
c. Reassembly.
(10) Connect the intercooler assembly (fig. 7-
(1) Place twenty-five needle bearings (24,
1).
pin hole in the connecting link. Place one washer
Removal and Installation
(25) over each end of the bearings. Carefully slide
a. Removal.
piston assembly (28) and scribe a small mark on
(1) Disconnect the intercooler assemblies
the inside of the piston skirt toward the fan end of
and aftercooler assembly from the third stage
the crankcase, over the connecting link and press
cylinder (fig. 7-1).
piston pin (27) through the piston, washers,
(2) Remove the fan assembly (para 7-3).
bearings, and connecting link. Secure the piston
(3) Loosen nut (8, fig. 7-3) and remove elbow
pin with cotter pin (26).
(7), preformed packing (9), and gasket (10) from
t h e cylinder inlet port.
NOTE
Assembly of the needle bearings and washers into
( 4 ) Remove reducer bushing (14) and seal
the connecting link can be facilitated by applying
(13) from the cylinder outlet port.
a coat of Petrolatum, Federal Specification VV-P-
( 5 ) Unscrew cylinder cap (4) and remove
236.
valve spring (5) and exhaust valve (6).
(6) If rupture disc (3) is defective unscrew
(2) Place shims (23) between two gaskets
disc retainer ring (1) and remove disc retainer (2)
(22) and position the gaskets onto the crankcase
and rupture disc (3).
mounting flange.
(7) Remove nuts (12) and carefully slide
(3) Carefully slide cylinder (34) over the
cylinder and sleeve (11) over the piston assembly
piston assembly and attach to the crankcase with
nuts (33). Tighten the nuts with equal torque.
(19).
(4) Use a depth micrometer or dial indicator
(8) Remove and discard gaskets (20 and 21).
to measure piston-head-to-valve-seat clearance.
(9) Remove cotter pin (17) and carefully
Required clearance is 0.002 to 0.006 inch (.0050 to
push piston pin (18) out of the piston assembly.
.0152 cm). If necessary, remove cylinder and add
Use care to prevent loss of the twenty-five needle
bearings (15) and two washers (16) which will
or remove cylinder-to-crankcase gaskets to obtain
drop out of the piston when the piston pin is
required clearance.
removed. Scribe a small mark on the inside
surface of the piston assembly toward the fan end
NOTE
of the crankcase for correct reassembly.
Overall thickness of steel gaskets can be reduced
in increments of 0.002 inch (.0050 cm) by peeling
( 1 0 ) Do not disassemble the piston
off laminations. At least one paper gasket must
assembly.
remain on each side of steel gasket in final
installation.
