Piston And Connecting Rod; Governor Arm - Toro GTS 150 Service Manual

Piston and Connecting
Rod
-
Removal
1. Note the orientation of the piston and connecting rod
prior to removal for proper reinstallation. There are
matching arrows on the connecting rod and rod cap
that point toward the push rods on assembly. See
Figure 72. The word "Mag" is also written on the side
of the connecting rod that should point toward the
magneto side of the engine.
MARKS
ARROWS
TOWARD PUSH RODS
Figure
72
2. If the piston is to be removed from the connecting rod
and reinstalled in the engine at a later time, note the
piston orientation in order to maintain the established
wear patterns. See Figure 73.
Figure
73
Piston Rings
-
Removal
1. Note the orientation of the piston rings prior to re-
moval. Use a piston ring expander to remove the
piston rings.
2. Remove the top compression ring, second compres-
sion ring and the three piece oil control ring. See
Figure 74.
A
VIEW AA
Figure
74
3. The top ring has no top or bottom orientation, how-
ever; if
it
is to be reused, install the ring using the
original positioning to maintain the established wear
patterns.
4.
The second ring has a step that must face the bott
of the piston.
5. The three piece oil control ring assembly uses scraper
rings above and below a ring expander.
Piston Pin Removal
1. Note the relationship of .the connecting rod to the
piston for correct assembly. The arrow on the con-
necting rod and the arrow on the face of the piston
must be on the same side.
2. Remove one of the retaining rings on the side of the
piston and push out the piston pin.
Governor Arm
-
Removal
1. The governor arm is retained with a pushnut on the
outside of the block and an upset on the shaft on the
inside.
2. The block does not use a seal on the governor shaft.
3. To remove the shaft, pry the pushnut
off
the outside of
the shaft and withdraw the shaft. Take care to
burrs on the shaft prior to removal. The burrs will
damage the bore in the block of the engine. See
Figure 75.
--
- . -
I
Figure
75
Engine disassembly is now complete.
GTS 150
39
Engine