valve seating surface of the valve plate (10). Position the
valve spring (12) on the inlet valve. Position the spacer
(13) on the valve plate. Measure the distance from the
Note
surface of the spacer to the surface of the spring.
Final positioning of the elbows will be
Record this value as the value "H."
determined during the assembly of the first
f. Determine the total second stage head
and second stage intercoolers.
clearance by subtracting the value of "F" from the value
of "G." Record this value as the value "I." Subtract the
46. Third Stage Assembly
value "I" from the value "H" and record as the value "J."
a. Determine the proper thickness of shim (2, fig.
This value "J" is the total head clearance.
11) required to give a proper 3d stage head clearance
g. Select the proper value of shim (15) by
between 0.010 and 0.015 inches as described in b
subtracting 0.018 + .002, which is the required second
through i below; refer to figure 19.
stage head clearance, from the value "J" and record this
b. Position the plunger and cylinder assembly (4,
value as the value "K"; select enough of shim with or
without the spacer (14) to equal the value "K". This
selection of shim with or without the spacer will provide
size hexagonal bar stock, so that he plunger is at top
the proper head clearance for the second stage.
dead center.
h. Remove the plunger subassembly (17) from the
c. Using a depth micrometer, measure 'the
second stage cylinder bore.
distance from the top of the 3d stage cylinder to the top
i. Assemble the three plunger rings (16) to the
of the third stage plunger. Record this value as value
plunger subassembly (17).
"L."
j. Position the plunger assembly (18) into the
d. Position the gasket (12, fig. 11) in the third stage
second stage cylinder bore using the second stage
cylinder bore and measure the distance from the top of
plunger insertion sleeve.
the third stage cylinder to the top of the gasket. Record
this value as value "M."
k. Position the selected thickness of shim (15),
spacer (14), if required, and spacer (13), in the second
e. Position the inlet valve (6) and the inlet valve
stage cylinder bore.
spring (5) on the valve plate (8). Measure the distance
Note
from the surface of the inlet valve spring to the outer
surface of the valve plate and record this value as value
The leaded surfaces shall be exposed on both
"N."
sides of the shim.
f. Measure the distance from the surface of the
l. Position the inlet valve spring (12), inlet valve
inlet valve spring (5) to the inner surface of the valve
(11), and the valve plate (10) in the second stage
plate (8) and record this value as value "0."
cylinder bore.
g. Determine the total third stage head clearance
m. Position the gasket (6) and the gasket (7) in
by subtracting the value "M" from the value "L" and
place in the head assembly (5).
record the value "N" from as value "P." Subtract the
n. Position the discharge valve (9) on the discharge
value "N" from the value "O" and record the remainder
valve seat of the valve plate (10) and follow with the
as value "Q." Add the value "P" and the value "Q" and
discharge valve spring (8).
record the sum as the value "R". The value "R" is equal
o. Position the head assembly (5) on the valve
to the total third stage head clearance.
plate (10) orienting the outlet port to the front of the
h. Determine the proper thickness 'of the shim (2)
compressor assembly. Align with the screw holes in the
by subtracting the required head clearance of 0.010 to
second stage cylinder. Secure the head assembly (5)
0.015 inches from the value "R" and record the
the four screws (1) and washers (2). Apply a torque to
remainder as value "S." The thickness of the shim with or
screws between 60 to 65 pound-inches using a 3/16-inch
without the spacer (3) must be equal to the value "S".
socket wrench.
p. Assemble the elbow (4) to the inlet port and
elbow (3) to the outlet port of second stage head
assembly (5).
AGO 5548A
30
