3-18
REMOVING VALVES
NOTE: Keep all valves and valve components as
a set. Note the original location of each valve set
for use during installation. Return each valve set
to its original location during installation.
1. Using a valve spring compressor, compress the
valve springs and remove the valve cotters.
Account for an upper spring retainer.
CC391D
2. Remove the valve seal and the lower remaining
spring seat. Discard the valve seal.
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DSC2274
NOTE: The valve seals must be replaced.
3. Remove the valve springs; then invert the cylin-
der head and remove the valves.
Measuring Valve stem to valve
guide clearance
1. Insert a snap gauge 1/2 way down into each
valve guide bore; then remove the gauge and
measure it with a micrometer. Record the mea-
surement.
2. Using a micrometer, measure the outside diame-
ter of the valve stem near the middle. Subtract
this measurement from the valve guide bore to
obtain the clearance measurement. Clearance
must not exceed specifications.
MEASURING CYLINDER HEAD
DISTORTION
1. Lay a straightedge across the cylinder head; then
using a thickness gauge, check the distortion
between the head and the straightedge.
CC388D
2. Maximum distortion must be within specifica-
tions.
CLEANING/INSPECTING CYLINDER
1. Wash the cylinder in parts-cleaning solvent.
2. Inspect the inside of the cylinder for pitting,
scoring, scuffing, glazing, or corrosion. If marks
are found, repair the surface using a ball hone
(see Honing Cylinder in this sub-section).
3. Place the head surface of the cylinder on the sur-
face plate covered with #400 grit wet-or-dry
sandpaper. Using light pressure, move the cylin-
der 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 con-
tinuing to move the cylinder in a figure eight
motion until a uniform bright metallic finish is
attained.
CLEANING/INSPECTING VALVES
1. Using parts-cleaning solvent and a wire brush,
clean the valves.
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