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3-17
3
CC127D
2. Measure the corresponding piston diameter at a
point 15 mm (0.6 in.) above the piston skirt at a
right angle to the piston-pin bore. Subtract this
measurement from the measurement in step 1. The
difference (clearance) must be within specifica-
tions.
Installing Piston Rings
1. Install the expander spring making sure the ends
are aligned on the wire; then install the oil ring
with the ring gap 90° from the spring gap and the
marking “E TOP” directed toward the top of the
piston.
GZ168
GZ169A
2. Install the second compression ring with the mark-
ing “E TOP” directed toward the top of the piston.
GZ167
3. Install the first (unmarked) compression ring; then
rotate the rings so the ring gaps are approximately
180° apart and orientated to the piston pin.
GZ187A
CYLINDER/CYLINDER HEAD
ASSEMBLY
NOTE: If the cylinder/cylinder head assembly
cannot be trued, they must be replaced.
Cleaning/Inspecting Cylinder Head
1. Using a non-metallic carbon removal tool, remove
any carbon buildup from the combustion chamber
being careful not to nick, scrape, or damage the
combustion chamber or the sealing surface.
2. Inspect the spark plug hole for any damaged
threads. Repair damaged threads using a
“heli-coil” insert.
! CAUTION
Incorrect installation of the piston rings will result in
engine damage.
! CAUTION
The cylinder head studs must be removed for this pro-
cedure.
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