Service Manual
2.
Clean the crankshaft of debris and any imperfections
that could damage the sump crankshaft seal.
It
is
recommended that a seal protector be put over the
crankshaft or tape wrapped over the shaft to prevent
damage to the seal.
3.
Pull the sump
off
the engine.
Governor and Splasher Operation
The governor and splasher are a combined unit driven by
the camshaft.
As
the engine speed increases the
fly-
weights on the governor will open through centrifugal force
causing the governor plunger to act on the governor arm.
The faster the engine runs, the greater the force applied to
the governor arm to close the throttle plate.
The paddles on the splasher mechanism provide immedi-
ate lubrication to all internal components of the engine,
including the upper main bearing. Upper main bearing
lubrication occurs through a drilled passage designed to
receive oil from the splasher.
Governor and Splasher Removal
1.
With the sump
off
the engine the governor/splasher
may be removed from the end of the camshaft. See
Figure
65.
Figure
65
2.
The governor/splasher is serviceable only as
an
assembly.
Camshaft Operation
The camshaft is made of a composite material and driven
by the crankshaft. The camshaft is timed with the crank-
shaft to cause the intake and exhaust valves to open and
close at the correct time. The camshaft
is
also responsible
for driving the oil pump and is hollow to accommodate the
flow of lubricating oil.
GTS
150
37
Camshaft Removal
1.
Note the timing marks on the crankshaft drive gear
and camshaft driven gear for proper assembly.
2.
Turn the crankshaft
so
the connecting rod cap is out
of the way of the camshaft.
3.
Make sure the cam followers are pushed out of the
way of the cam lobes and pull the camshaft out of the
block. See Figure
66.
Figure
66
4.
Remove the cam followers. The cam followers are
identical, however;
if
the engine has been run and the
followers are going to be reused, make sure you install
the followers
in
their original position to maintain
established wear patterns. See Figure
67.
Figure
67
Compression Release Operatlon
The compression release operates through centrifugal
force. At starting speeds the end of the compression
release arm
rises
slightly above the intake lobe on the
Englne