1
11 timing mark
8
Screw, No. 8-32 x 1/4 in. lg
2
TC timing mark
9
Condenser
3
Brush spring
10
Brush block (4 rqr)
4
Screw, rd hd No. 10-32 x 5/8 in. Ig (8 rqr)
11
Bearing support
5
Screw, No. 10-32 x 3/4 in. Ig (4 rqr)
12
26 timing mark
6
Screw, 1/4-20 x 1/2 in. Ig (8 rqr)
13
Starter-generator frame
7
Brush
14
Gearcase
Figure 27-Continued.
installing the eight screws (6) which
(2) Inspect the commutator.
Clean the
secure the bearing support on the frame.
commutator with fine sandpaper if dirty or
discolored.
(2)
Install the condenser (9) on the bearing
support by installing the screw (8), which
(3) Report a damaged commutator to the
secures the condenser.
proper authority.
(3)
Install the brush block (10) and spring (3),
(4) Inspect the brushes. If the brushes are
securing with the eight screws (4).
oil-soaked or worn to less than one-half of
their original length, replace.
(4)
Install the brushes (7) by inserting them in
the brush block. Secure the brush leads
c. Adjusting Spring Tension.
in position with the four screws (5).
(1) Inspect brush springs. Spring tension
(5)
Install the blower wheel hub (5, fig. 12) on
must be uniform; proper spring tension for
the blower wheel (1, fig. 31) and
the starter-generator is 22 to 25 pounds.
camshaft, by installing the flat washer (7,
(2) Spring tension can be adjusted by slightly
fig. 12), lockwasher, and nut (8) on the
bending the mounting support or by
crankshaft.
bending the spring at the base of the last
(6)
Install the four screws (6) which also
coil, whichever method applies.
secure the hub to the blower wheel.
d. Installation.
(1) Install the bearing support (11, fig. 27) on
the starter-generator frame (13) by
Section VIII. ENGINE
121. Description
(2) Disconnect the ignition cable (3) at the
The engine is an internal combustion, 4-cycle,
spark plug (1).
gasoline type engine. An oil pressure relief valve,
(3) Remove the spark plugs from the cylinder
mounted on top of the cylinder block behind the
heads (6).
crankcase breather is used to adjust oil pressure in the
(4) Remove the 14 nuts (5, fig. 23) and
engine. A breather valve mounted in the crankcase
lockwashers which secure each of the
breather cap helps to maintain a slight vacuum in the
cylinder heads to the engine cylinder
engine crankcase during operation. It is designed to
block.
reduce oil leaks caused by internal crankcase pressure.
(5) Remove each of the cylinder heads and
gaskets from the block.
122. Cylinder Heads and Cylinder Shrouds
b. Cleaning, Inspection, and Repair.
a. Removal.
(1) Replace a cylinder head which has broken
(1) Remove the two cylinder air shrouds (5,
cooling fins, or other damage.
fig. 17), one from each side of the engine,
(2) Replace a cylinder air shroud which is
by removing screws (3 and 4, fig. 23) and
badly bent or damaged.
lockwashers which attach each of the two
cylinder air shrouds to the cylinder heads
(6, fig. 17).
65