TM 5-4310-375-14
rod (27) as marked at disassembly. Install two each bolts (25), lockwashers (24) and nuts (23). Torque
nuts (23) to 20-22 ft-lbs (2.8 -3.0 kgs-m).
(3) Slide piston pin (20) through piston (21) and piston pin bushing (29) attaching second stage piston (21) to
connecting rod assembly (22). Install two retaining clips (19).
(4) Use a piston ring expander and install the four-ring piston ring set (18) in grooves on piston (21). Stagger
ring gaps approximately 90 degrees.
(5) If removed, press bushing (16) into piston pin end of connecting rod (14). If removed, install oil splash
rod (15) in connecting rod cap (13).
(6) Coat bearing (17) liberally with clean compressor oil. Install connecting rod bearing (17) halves in cap (13)
and connecting rod (14). Attach connecting rod assembly (9) to crankshaft, matching rod cap (13) to rod
(14) as marked at disassembly. Install two each bolts (12), lockwashers (11) and nuts (10). Torque nUtS (10)
to 20-22 ft-lbs (2.8 - 3.0 kgs-m).
(7) Slide piston pin (7) through piston (8) and piston pin bushing (16) attaching first stage piston (8) to connect-
ing rod assembly (9). Install two retaining clips (6).
(8) Use a piston ring expander and install the three-ring piston ring set (5) in grooves on piston (8). Stagger
ring gaps approximately 120 degrees.
(9) Coat rings (5, 18) and cylinder (3) bores liberally with clean compressor oil.
(l0) Place a new cylinder gasket (4) in position on compressor frame. Use piston ring compressors on first stage
and second stage piston rings (5, 18) and install cylinder (3). Install six each washers (2) and cylinder bolts
(1). Torque bolts (1) to 30-33 ft-lbs (4.1 - 4.6 kgs-m).
(11) Install flywheel (para 4-21). Assemble and install cylinder head and valves (para 4-19) and intercooler and
aftercooler (para 4-20). Install air compressor assembly on unit (para 4-18). Install and adjust drive belts
5-10. Crankshaft, bearings, seal, compressor frame. Refer to para 3-11 and remove air intake filter. Refer to para 4-14
and remove belt guard. Refer to para 4-18 and remove air compressor from unit. Place air compressor on a work
bench. Refer to para 4-19 and 4-20 and remove cylinder head and valves and the intercooler and aftercooler respectively.
Refer to para 5-9 and remove cylinder, pistons, and connecting rods. Maintenance of crankshaft, bearings, seal, and
compressor frame is as follows:
a . Removal/Disassembly. Remove and disassemble these functional group parts in sequence below to extent
necessary.
(1) Remove oil drain hose (23, fig 5-5), drain cock (24), drain assembly (25) and gasket (26) from frame (27).
(2) Remove flywheel bolt (1, fig 5-5), washer (2) and flywheel (3) as instructed in para 4-21.
(3) Unscrew and remove four screws (4), the front plate (5) and gasket (6). Use a suitable puller and remove
oil seal (7).
(4) Pull crankshaft (9), with bearings (8, 10) out of compressor frame (27). As necessary, use a puller to free
bearing (10) from bore in rear plate (17).
5-15
