TM 5-4310-360-14
CHAPTER 6
REPAIR
INSTRUCTIONS
Section I. REPAIR OF PNEUMATIC
EQUIPMENT
6-1. General.
When removing connecting rods (10
(6)
and 23) from crankshaft by removing
The compressor is a two-stage, two-cylinder, air
rod cap screws (13 and 26) and lock-
cooled unit. There is one low-pressure piston and
washers (12 and 25) from connecting
one high-pressure piston operating off the crank-
rods, be sure that rods and caps (10
shaft. The major repair instructions are those
and 23) are kept in matched sets. Note
covering replacement of the cylinder head, and
the position, with reference to the
valves, pistons and rings, connecting rods, crank-
crankshaft, of the identification marks
shaft, cylinder and crankcase.
on one side of each so that the con-
necting rod can be replaced in the
same position it originally occupied.
6-2. Pistons, Rings, Connecting Rods, Cylinder
Remove bushings (11 and 24) only if
Block, Crankshaft and Crankcase.
worn or scored.
a.
Removal and Disassembly.
Drive oil seal (1, figure 6-2) out of
(7)
crankcase if replacement is necessary,
Loosen hub nut and remove flywheel.
(1)
by evenly spaced blows from inside.
Remove cap screws (27, figure 6-1)
(2)
holding cylinder (29) to crankcase
(2, figure 6-2) and lift off cylinder.
b.
Cleaning, Inspection and Repair.
Mark top of each piston on side
nearest pulley so that they can be
WARNING: Drycleaning solvent, P-D-680,
reinstalled in the same position.
used to clean parts is potentially dangerous
to personnel and property. Avoid repeated
and prolonged skin contact by wearing
Remove key (7) from crankshaft (6)
(3)
rubber or solvent impermeable gloves when
and file the edges of the keyway to
handling the solvent or material wet with
remove burrs, thus avoiding damage
drycleaning solvent. Wash hands immedi-
to the oil seal when removing crank-
ately after exposure with soap and water
shaft.
and use a lanolin based skin cream to
prevent skin drying. Do not use near open
Remove end cover (11) and slide
(4)
flame or excessive heat. Flash point of
crankshaft with connecting rods and
solvent is 100oF (38C). Ensure that venti-
pistons, out of crankcase being careful
lation adequate to reduce solvent vapor
not to damage the oil feeder ring (8).
concentrations below acceptable threshold
Place pulley end of crankshaft in a
limit values is provided.
vise using soft jaws to prevent damage.
Clean all parts with cleaning solvent,
(1)
To remove pistons (6, 19, figure 6-1)
(5)
P-D-680, and dry thoroughly.
remove washers (8 and 21) from end
of wrist pins (7 and 20) and drive
wrist pins out of pistons at ambient
Examine cylinder bores for wear, scor-
(2)
temperature. It is not necessary to
ing, pitting, cracks or other damage.
heat piston. Remove piston rings (3,
Replace cylinder with damaged bores.
4, 5, 16, 17 and 18) from pistons.
6-1
