34
CC127D
2. Wash the cylinder in parts-cleaning solvent.
3. Inspect the cylinder for pitting, scoring, scuffing, and
corrosion. If marks are found, repair the surface
using a #320 grit ball hone.
NOTE: To produce the proper 60° cross-hatch pat-
tern, use a low RPM drill (600 RPM) at the rate of 30
strokes per minute. If honing oil is not available, use a
lightweight petroleum-based oil. Thoroughly clean
cylinder after honing using soap and hot water. Dry
with compressed air; then immediately apply oil to
the cylinder bore. If the bore is severely damaged or
gouged, replace the cylinder.
CC390D
4. At this point, repeat step 1 and if any measurement
exceeds the limit, the cylinder must be replaced.
Measuring Camshaft Lobe Height
1. Using a micrometer, measure each cam lobe height.
YT129
2. The lobe heights must exceed minimum specifica-
tions.
Inspecting Camshaft Bearing/
Sprocket
1. Inspect the camshaft bearings for roughness during
rotation or signs of discoloration.
YT128
2. Inspect the timing sprocket for excessive wear.
YT127
Installing Top-Side
Components
A. PISTON
B. CYLINDER
1. Lubricate the piston pin, connecting rod, and piston
pin bore with motor oil; then install the piston on the
connecting rod making sure there is a circlip on each
side and the open end of the circlip is directed
upwards or downwards.
NOTE: The piston should be installed so the word
“IN” points upward.
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