cylinder onto piston and press firmly
crankcase serve as shims to obtain
into crankcase. Secure cylinder with
proper
piston-head-to-valve-seal
four nuts (7).
clearance. The number of gaskets
used will vary with each cylinder. By
(5) Use a depth micrometer or dial
measuring the thickness of removed
indicator to measure and adjust piston-
gaskets and adding 0.005 for each
head-to-valve-seal clearance.
The
new paper gasket to allow for crush
required clearance is 0.002 to 0.006
at installation, new gaskets required
inch.
to obtain proper clearance can be
(6) Install valve (8), spring (9), washer
selected
with
ease
during
(10), packing (11), and cylinder cap
reassembly.
(12) on second stage cylinder. Tighten
cylinder cap with 300-350 pound-inch
2
Note .
The cylinder-and-piston
assembly is made up of matched
(7) Install disk (13) and retainer (14) and
parts. Do not attempt to replace
secure parts inside cap (12) with
individual parts.
retainer screw (15).
d. Assembly.
3-14. Third Stage Section
Note. To measure and adjust piston-
a. Description. The third stage section consists
head-to-valve-seat clearance, install
of the elbow, retainer, ring, disk, cap, exhaust valve
first or third stage cylinder-and-
spring, exhaust valve, reducer, gaskets, seals, cylinder-
piston assembly to guide the cylinder
and-piston assembly, and attaching hardware.
being measured and adjusted.
b. Maintenance. Third stage section overhaul is
(1) Place 25 needle rollers (17) around
accomplished by replacing the cylinder cap, exhaust
edge of wrist-pin hole in one end of
valve spring, exhaust valve, and the cylinder-and-piston
second stage connecting link (3) Place
assembly.
link washers (4) at ends of needle
rollers. Position connecting link inside
Note.
The
cylinder-and-piston
piston of cylinder-and-piston assembly
assembly is made up of matched
(16) and press in wrist-pin (6). Secure
parts.
Do not attempt to replace
with cotter pins (5).
individual
parts.
Additional
components to be replaced in the third
Note. Assembly of needle rollers and
stage section are included in the third
link washers in connecting link is
stage connecting link repair kit.
simplified by coating the parts with
petrolatum (W-P-236) causing the
c. Disassembly.
parts to adhere to each other.
(1) Unscrew and remove retainer (1, fig. 3-
(2) Pass free end of second stage
6). Remove disk ring (2) and disk (3)
connecting link (3) through the cylinder
from inside cap (4).
mounting hole in the crankcase.
(2) Unscrew and remove cap (4).
Marks scribed in piston skirts during
Remove exhaust valve spring (5) and
disassembly should be toward fan end
exhaust valve (6) from inside cylinder-
of crankcase.
and-piston assembly (15).
(3) Secure connecting link to master rod
(3) Remove four nuts (7) and carefully pull
with wrist-pin (6) and cotter pin (5).
cylinder from piston of cylinder-and-
(4) Place gasket (2) flanked by two paper
piston assembly (15).
gaskets (1) on mounting flange of
second stage cylinder with cylinder fins
slanted toward fan end of shaft. Slip
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