camshaft which prevents the intake valve from fully seat-
ing. This, in turn, eases starting resistance. At operating
speeds, centrifugal force will cause the arm to move
out
of
the way
of
the cam lobe and will allow the intake valve to
fully close,
Compression Release Removal
1.
If disassembly is necessary, take note of how the
compression release lever and spring is installed, and
drive the pivot pin
out
of the camshaft with a pin punch.
2.
Note that the pin can be removed only from one
direction. See Figure
68.
Figure
68
Crankshaft Removal
1.
Remove the
two
7/16
hex, cap screws retaining the
rod cap. Note the orientation
of
the rod cap for proper
reinstallation. See Figure
69.
Figure
69
2.
Pull
the rod cap
off
the crankshaft connecting rod
journal and push the piston and connecting rod out of
the way of the crankshaft. See Figure
70.
Figure
70
3.
The crankshaft may now be withdrawn from the
engine. Place a sleeve
or
tape over the crankshaft to
prevent the crankshaft keyway from cutting the seal.
4.
The camshaft drive gear is keyed to the crankshaft
and may be removed. Take care to note the side of the
gear with the timing mark for correct installation. See
Figure
71.
Figure
71
Piston and Connecting Rod Operation
The piston is of a special casting and tapered machining
design with a dished face. The casting and machining
provide for quiet operation and excellent cooling.
The piston and connecting rod are both marked for proper
assembly. The arrow on the face of the piston should be
on the push rod side of the engine. The arrow on the
connecting rod should point toward the push rods. The
connecting rod also uses the word "mag" on the side that
should be toward the magneto.
Engine
38
GTS
150
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