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 TM 55-1925-204-12
(l) Uncover ends and install air lines
(c) Remove the 6 capscrews and cover.
removed, then secure lines with bolts and clamps. Open
(d) Remove the 6 plugs, valve retaining (one
starting valve.
at a time).
(2) Removal. To remove the air starting distributor,
(e) Remove spring and valve from the valve
for overhaul, or to clear upper base, proceed as follows:
port.
bolts and clamps.
CAUTION
(b) Tag and remove the oil line.
If the valves are going to be removed more
(c) Disconnect the reversing shaft.
than one at a time, mark them for
(d) Tag and remove the 7 air lines.
reinstallation in the same valve port, with
(e) Remove the 14 capscrews.
the same guide. The valve and guide are
(f) Remove the air distributor, then lift gasket
lapped and MUST be reinstalled as a unit.
off the upper base.
(3) Installation. Refer to view B of figure 4-5 and
(f) Clean parts in clean fuel oil and blow dry
reverse the procedure in steps (a) through (f) of (2) above.
with ships service air. Inspect the spring for damage or
c. Reverse Control. Turning the control handwheel past
weakness. Replace a damaged spring.
"stop" moves a crank that operates the reversing shaft in the
(g) Lubricate the lapped surfaces of guide
reversing mechanism, which in turn moves the cam shifting
and valve. Install in valve port. Reach inside housing and push
shaft. This shaft operates to move the proper cam into position
valve and guide back and forth to determine they operate freely,
for timing the air distributor valves so that the desired rotation
but are not loose from wear.
and firing of the cylinders is achieved. For inspection and firing
(h) Install spring over valve, place new
of the cylinders is achieved. For inspection and replace ent of
m
gasket at port, then install plug.
defective parts, proceed as follows:
(i) Repeat steps (e) through (g) above for
(1)
Removal.
the remaining valves (one at a time). U) If valve and guide are
(a) Close starting air valve.
defective in any of the 6 valve ports, replace the air starting
(b) Remove the air distributor (b., (2) above)
housing by removing 6 nuts (view A, fig. 4-5) and air starting
place it on a suitable workbench.
housing with valves and guides. Install a new gasket under the
(2) Disassembly.
new housing.
(k) When valves are clean and serviceable,
cover, and gasket (20, fig. 4-6).
place new cover gasket on housing, install cover, and secure
with 6 capscrews.
4-13
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