(10) Install connecting rod (27, fig. 6-7) on
(5) Measure the clearance between piston pin
crankshaft crank pin bushing. Check that clearance is
(19) and piston (20). This is a very close tolerance. It
between 0.001 and 0.002 in. (table 1-2). After checking
should be between 0.0003 in. and 0.0009 in. If clearance
clearance between pin (22 and rod (27), a close tolerance
is as much as 0.0012 in. replace pin and piston. Install
of between 0.0002 and 0.0007 in., if satisfactory install pin
pin (19) through rod (24) and piston (20), and secure with
(22) through rod (27) and piston (23), then secure pin with
the lockrings (18).
lockrings (21).
NOTE
(11) Fill oil ring grooves of piston (23) with
Place piston rings in cylinder bore
compressor lubricating oil. Place ring set in cylinder (17)
to measure end gap before
bore, then measure end gap. It should measure between
installation in ring rooves. Also
0.005 and 0.015 in. If satisfactory, install ring (26) in
measure piston to bore clearance.
bottom groove of piston (23). Install ring (25) in the
If ring end gap is between 0.005
second groove from the bottom. Install one ring (24) in
the second groove from the top, and the other ring (24) in
and 0.015 in., they are satisfactory.
the top groove. Turn end gaps of rings until they are 9G0
If piston clearance in bore of high
from each other.
pressure cylinder (1 3/4" dial) is
between 0.0025 and 0.0035 in. the
(12) Lubricate bore of cylinder (17); position
clearance is satisfactory. Piston
gasket (18) over rod (27) to fit on frame. Position cylinder
pin to connecting rod clearance
(17) over piston and rings, press in on rings until they slip
should be between 0.0002 and
into the tapered skirt of the bore. It is recommended that
0.0007 in. If in this range, they are
a ring compressor be used for this purpose to avoid
satisfactory.
distorting or breaking the rings. Install steel washers (15)
and capscrews (14). Tighten to a torque value given for
the size in table 1-1.
(6) Before installing rings, see that all ring
grooves are lubricated with compressor lubricating oil.
(13) Install valves (13) and secure with fillister
head screws (12), lockwashers (11), and nuts (10). Install
(7) Install ring (23) in bottom groove of piston
gasket (9), spacer and valves complete (6), gasket (4),
(20). Install the expander in groove first, before ring (22),
and air head (3). Secure with four capscrews (1). Tighten
in the second groove from bottom of piston, then install
to a torque value for the size given in table 1.-i. Install
rings (21) in the second groove from top, and the top
connector (28) in cylinder (17).
groove of piston (20). Move end gap at all rings of set
until they are staggered at 900 to each other.
(14) Install elbows (14 and 13, fig. 6-6), in
cylinders. Install pipe plug (12) in elbow (13), then install
(8) Position cylinder gasket (15) on frame, then
intercooler tube (11) in elbows (13 and 14).
position cylinder (14) over piston (20) and press in on
rings until they slip into the tapered bottom of the cylinder.
(15) Install 2 elbows (10). Install aftercooler
It is recommended that a ring compressor be used at this
tube (9) in elbows (10). Install 3 clamps (7), and brace (8)
time to avoid distorting or breaking the rings. Seat
on aftercooler (9) and secure with internal lockwashers (6)
cylinder on gasket, then install steel washers (12) and
and capscrew (5). Tighten to a torque value given for
capscrew (11). Tighten to a torque value for size given in
size in table 1-1.
(16) Install fanwheel (4) on crankshaft and
(9) Install gasket (8), spacer (9) and valve plate
secure with capscrew (3), lockwasher (2) and nut (1).
(10). Install two gaskets (4) and air head (3), then install
Tighten to a torque value given for size in table 1-1.
capscrews (1) and tighten to a torque value given for the
size in table 1-1.
e. Installation. Refer to paragraph 4-10 and install
the air compressor.
6-13
