TM 5-4930-218-14
above, This procedure will minimize crankshaft end
(2) Carefully unscrew spring-loaded release valve
play.
body (14) and remove spring (15) and ball (16).
(2) Remove housing from crankcase and install
Remove nut (17) and body (18).
housing gaskets as determined above. Install housing
(3) Remove six screws (19) that secure the cover
and secure with attaching screws. Tighten screws to
(20) to the governor housing; remove cover and gasket
a maximum of 25 foot-pounds torque.
(21). Remove the release valve plunger (22) from the
(3) Reassemble the balance of centrifugal
governor housing cover.
unloader in the reverse order of disassembly as
(4) Drive out spring pins (23) and remove gover-
illustrated in figure 7-2.
nor weights (24). Remove spring sleeve (25), main
spring (26), and washer (27).
(5) Remove the spindle (30) from the crankshaft
by removing screw (28) and washer (29).
a. Removal.
(1) Drain oil from crankcase by removing oil
(6) Remove baffle plate (31), nut (32) and body
drain plug (6, fig. 7-2).
(33) from governor housing. Remove four screws (34)
(2) Remove handhole plate (9) and gasket (10).
that secure governor housing to crankcase (38);
b. Cleaning and Inspection.
remove housing (35) and gasket (36).
(1) Discard and replace the handhole plate
c. Cleaning and Inspection.
gasket.
(1) Discard and replace all gaskets.
(2) Clean handhole plate with dry cleaning
(2) Clean all parts with dry cleaning solvent (fed.
solvent (fed. spec. P-D-680) and dry thoroughly.
spec. P-D-680) and dry thoroughly.
(3) Inspect for cracks, breaks, and dents.
(3) Inspect the springs for loss of tension and set.
Straighten out minor dents. Replace if defective.
Replace if defective.
c. Installation. Install the handhole plate (9) and
(4) Inspect the housing cover, baffle plate, and
new gasket (10) with its attaching screws (8). Tighten
housing for cracks, breaks, damaged threads, or other
screws to a maximum of 25 foot-pounds torque.
damage. Replace if defective.
(5) Inspect the plunger, sleeve, governor pin,
7-8. Pistons, Piston Rings, Connecting
spindle, and weights for cracks, nicks, burrs, wear, or
Rods, and Cylinder Block
other damage. Replace all damaged or worn parts.
a. Removal and Disassembly.
(6) Inspect all hardware for breaks, distortion, or
(1) Remove oil drain plug (6, fig. 7-2) and drain
damaged threads. Replace all damaged hardware.
oil.
(2) Remove compressor flywheel (para 7-2).
d. Reassembly and Installation.
(3) Remove the head unloaders (para 7-3).
(1) Carefully install the housing (35, fig. 7-2). Do
Remove exhaust manifolds (para 7-4).
not install the housing gaskets (36) at this time. At-
(4) Remove intake and exhaust valves (para 7-5).
tach the housing to the crankcase (38) with one screw
To insure correct reassembly, tag each valve for iden-
(34) at the top and one screw at the bottom. You
tification of cylinder and whether it is an intake or
should make certain that the main bearing cup (11,
exhaust valve.
(5) Remove handhole plate and gasket (para 7-7).
the housing. Set the two attaching screws finger
(6) Separate the connecting rods from crankshaft
tight. Use feeler gage and measure the gap between
by removing connecting rod bolt (1, fig. 7-3) and con-
housing and crankcase at top and bottom. Average
necting rod and cap (2). The connecting rod and con-
the two dimensions and add 0.005 inch to determine
necting rod cap are matching parts. Tag cap and rod
the selection of housing gaskets to use. A com-
for identification to aid reassembly.
bination of gaskets should equal the total determined
