3-17
3
DSC02176
2. Insert an inside dial indicator into the piston pin
bore. The maximum diameter must be within
specifications. Take two measurements to
ensure accuracy.
MEASURING PISTON
SKIRT/CYLINDER CLEARANCE
1. Insert an inside dial indicator to measure the cyl-
inder front to back in six places.
2. Measure the corresponding piston diameter at a
point 10 mm above the piston skirt at a right
angle to the piston-pin bore. Subtract this mea-
surement from the measurement in step 1. The
difference (clearance) must be within specifica-
tions.
DSC02178
INSTALLING PISTON RINGS
1. Install the oil expander ring in the bottom ring
groove of the piston; then install the lower and
upper scraper rings over the expander making
sure the ends of the expander do not overlap.
Stagger the end gaps of the scraper rings accord-
ing to the illustration.
DSC00100
2. Install the second compression ring with the
taper directed toward the piston dome; then
install the top compression ring with the orienta-
tion mark directed toward the piston dome.
Stagger the ring end gaps according to the illus-
tration.
Cylinder/Cylinder Head
CLEANING/INSPECTING CYLINDER
HEAD
1. Using a non-metallic carbon removal tool,
remove any carbon buildup from the combus-
tion chamber being careful not to nick, scrape,
or damage the combustion chamber or the gas-
ket sealing surface.
2. Inspect the spark plug hole for any damaged
threads. Repair damaged threads using a
“heli-coil” insert.
3. Place the cylinder head on Surface Plate (p/n
0644-016) covered with #400 grit wet-or-dry
sandpaper. Using light pressure, move the cylin-
der head in a figure eight motion. Inspect the
sealing surface for any indication of high spots.
A high spot can be noted by a bright metallic
finish. Correct any high spots before assembly
by continuing to move the cylinder head in a fig-
ure eight motion until a uniform bright metallic
finish is attained.
! CAUTION
Incorrect installation of the piston rings will result in
engine damage.
! CAUTION
Water or parts-cleaning solvent must be used in
conjunction with the wet or dry sandpaper or dam-
age to the sealing surface may result.
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