TM 5-4310-352-14
bore, then measure end gap. It should measure between
install shaft end cover and seal as described in caution
0.005 and 0.015 in. (0.01 and 0.03 cm). If satisfactory,
above. Secure cover with four steel washers (12) and
install ring (26) in bottom groove of piston (23). Install ring
capscrews (11). Tighten capscrews to the torque value
(25) in the second groove from the bottom. Install one
given for their size in Table 1-1. Install connector (10) and
ring (24) in the second groove from the top, and the other
breather tube (9) in frame (17), then install nipples (7)
ring (24) in the top groove. Turn end gaps of rings until
elbows (18), nipples (19), coupling (6), and plug (5).
they are 90 from each other.
(6) Install connector (25, fig. 6-7) and con-
(14) Lubricate bore of cylinder (17); position
necting rod (24). Check clearance between crank pin
gasket (18) over rod (27) to fit on frame. Position cylinder
bushing and connecting rod. It should be between 0.001
(17) over piston and rings, press in on rings until they slip
and 0.002 in. (0.001 to 0.005 cm). If clearance is 0.0025
into the tapered skirt of the bore. It is recommended that a
in. (0.006 cm) replace bushing and connecting rod.
ring compressor be used for this purpose to avoid distort-
(7) Measure the clearance between piston pin
ing or breaking the rings. Install steel washers (15) and
(19) and piston (20). This is a very close tolerance. It
capscrews (14). Tighten to a torque value given for the
should be between 0.0003 in. and 0.0009 in. (0.0007 and
size in table 1-1.
0.002 cm). If clearance is as much as 0.0012 in. (0.003.
(15) Install valves (13) and secure with fillister
cm) replace pin and piston. Install pin (19) through rod
head screws (12), lockwashers (11), and nuts (10). Install
(24) and piston (20), and secure with the lockrings (18).
gasket (9), spacer and valves complete (6), gasket (4),
NOTE
and air head (3). Secure with four capscrews (1). Tighten
Place piston rings in cylinder bore to measure
to a torque value for the size given in table 1-1. Install
end gap before installation in rings grooves.
connector (28) in cylinder (17).
Also measure piston to bore clearance. If ring
(16) Install elbows (15 and 16, fig. 6-5), in cylin-
end gap is between 0.005 and 0.015 in. (0.013
der, then install intercooler tube (12) into the elbows.
and 0.039 cm), they are satisfactory. If piston
(17) Install elbow (14) in end of elbow (15) and
clearance in bore of high pressure cylinder (134"
install safety valve (13) into elbow (14).
dial) is between 0.0025 and 0.0035 in. (0.006
(18) Install 2 elbows (11). Install aftercooler tube
and 0.008 cm) the clearance is satisfactory.
(10) in elbows (11). Install 3 clamps (8), and brace (9) on
Piston pin to connecting rod clearance should
aftercooler (10) and secure with internal lockwashers (7)
be between 0.0002 and 0.0007 in. (0.0005 and
and capscrew (6). Tighten to a torque value given for size
0.001 cm). If in this range, they are satisfactory.
in table 1-1.
(8) Before installing rings, see that all ring
(19) Install fanwheel (5) on crankshaft and se-
grooves re lubricated with compressor lubricating oil.
cure with capscrew (4), lockwasher (3) and nut (2).
(9) Install ring (23) in bottom groove of piston
Tighten to a torque value given for size in table 1-1.
(20). Install the expander in groove first, before ring (22),
in the second groove from bottom of piston, then install
the air compressor.
rings (21) in the second groove from top, and the top
groove of piston (20). Move end gap at all rings of set
until they are staggered at 90to each other.
6-7. Dehydrator and Outlet Air Filter Replacement
(10) Position cylinder gasket (15) on frame, then
a. General. Complete replacement of the dehy-
position cylinder (14) over piston (20) and press in on
drators or outlet air filter should never be necessary. Re-
rings until they slip into the tapered bottom of the cylinder.
pairs, by replacing components found defective, should
It is recommended that a ring compressor be used at this
be all that is required. However, when a defective re-
time to avoid distorting or breaking the rings. Seat cylin-
ceiver must be replaced, the dehydrator bracket, dehy-
der on gasket, then install steel washers (12) and cap-
drators, 'and outlet air filter must be removed and rein-
screw (11). Tighten to a torque value for size given
stalled.
in table 1-1.
b. Removal and Installation of Dehydrators.
(11) Install gasket (8), spacer (9) and valve
(1) Shut off all power at source and lock it out.
plate (10). Install two gaskets (4) and air head (3), then
(2) Drain the air receiver (para 3-14).
install capscrews (1) and tighten to a torque value given
(3) Disconnect the outlet air piping to dehy-
for the size in table 1-1.
drators, remove mounting hardware and remove the de-
(12) Install connecting rod (27, fig. 6-6) on
hydra- tors with bracket (fig. 6-9).
crankshaft crank pin bushing. Check that clearance is
(4) Position bracket with dehydrators on re-
between 0.001 and 0.002 in. (0.002 and 0.005 cm) (table
ceiver and secure with mounting hardware.
(5) Connect air line components to dehydra-
(27), a close tolerance of between 0.0002 and 0.007 in.
tors.
(0.0005 and 0.001 cm) if satisfactory install pin (22)
(6) Close air receiver drain.
through rod (27) and piston (23), then secure pin with
(7) Energize power source.
lockrings (21).
c. Removal and Installation of Outlet Air Filter.
(13) Fill oil ring grooves of piston (23) with
(1) Shut off all power at source, and lock it out.
compressor lubricating oil. Place ring set in cylinder (17)
6-13
