3-26
CC128D
Measuring Cylinder Head
Distortion
1. Remove any carbon buildup in the combustion
chamber.
2. Lay a straightedge across the cylinder head; then
using a feeler gauge, check the distortion factor
between the head and the straightedge.
3. Maximum distortion must not exceed specifica-
tions.
CC141D
Cleaning/Inspecting Cylinder
1. Wash the cylinder in parts-cleaning solvent.
2. Inspect the cylinder for pitting, scoring, scuff-
ing, warpage, and corrosion. If marks are found,
repair the surface using a cylinder hone (see
Honing Cylinder in this sub-section).
3. Place the cylinder on the surface plate covered
with #400 grit wet-or-dry sandpaper. Using light
pressure, move the cylinder in a figure eight
motion. Inspect the sealing surface for any indi-
cation 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 cyl-
inder in a figure eight motion until a uniform
bright metallic finish is attained.
CC129D
Inspecting Cam Chain Guide
1. Inspect cam chain guide for cuts, tears, breaks,
or chips.
2. If the chain guide is damaged, it must be
replaced.
Honing Cylinder
1. Using a slide gauge and a dial indicator or a
snap gauge, measure the cylinder bore diameter
in three locations from top to bottom and again
from top to bottom at 90° from the first mea-
surements for a total of six measurements. The
trueness (out-of-roundness) is the difference
between the highest and lowest reading. Maxi-
mum trueness (out-of-roundness) must not
exceed specifications.
CC127D
2. Wash the cylinder in parts-cleaning solvent.
3. Inspect the cylinder for pitting, scoring, scuff-
ing, and corrosion. If marks are found, repair the
surface using a ball hone.
! 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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