3-24
CC400D
2. Remove each ring by working it toward the
dome of the piston while rotating it out of the
groove.
NOTE: If the existing rings will not be replaced
with new ones, note the location of each ring for
proper installation. When installing new rings,
install as a complete set only.
Cleaning/Inspecting Piston Rings
1. Take an old piston ring and snap it into two
pieces; then grind the end of the old ring to a 45°
angle and to a sharp edge.
2. Using the sharpened ring as a tool, clean carbon
from the ring-grooves. Be sure to position the
ring with its tapered side up.
Measuring Piston-Ring End Gap
(Installed)
1. Place each compression ring in the wear portion
of the cylinder. Use the piston to position each
ring squarely in the cylinder.
2. Using a feeler gauge, measure each piston-ring
end gap. Acceptable ring end gap must be
within specifications.
CC280D
Measuring Piston Pin (Outside
Diameter) and Piston-Pin Bore
1. Measure the piston pin outside diameter at each
end and in the center. If measurement is not
within specifications, the piston pin must be
replaced.
ATV-1070
2. Insert an inside dial indicator into the piston-pin
bore. The diameter must not exceed specifica-
tions. Take two measurements to ensure accu-
racy.
ATV-1069
! CAUTION
Improper cleaning of the ring-grooves by the use of
the wrong type of ring-groove cleaner will result in
severe damage to the piston.
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