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2. Using a feeler gauge, measure each piston-ring end
gap. Acceptable ring end gap must not exceed speci-
fications.
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 speci-
fications, the piston pin must be replaced.
ATV-1070
2. Insert an inside dial indicator into the piston-pin
bore. The diameter must not exceed specifications.
Take two measurements to ensure accuracy.
ATV-1069
Measuring Piston Skirt/Cylinder
Clearance
1. Measure the cylinder front to back in six places.
CC127D
2. Measure the corresponding piston diameter at the
recommended point above the piston skirt at a right
angle to the piston-pin bore. Subtract this measure-
ment from the largest measurement in step 1. The
difference (clearance) must not exceed specifica-
tions.
Installing Piston Rings
1. Install the oil expander (spacer) making sure the
open end is positioned 90° away from the directional
arrow as indicated. Install the lower oil control
(lower rail) ring at 0° from the directional arrow;
then position the opening of the upper oil control
(upper rail) ring 180° away from the piston direc-
tional arrow.
NOTE: Note the direction of the exhaust side of the
piston (
◄
) marking for correct ring end gap orienta-
tion.
H1-051
2. Install the second compression ring with the marking
“RN” directed toward the top of the piston. Orientate
the opening of the ring at 0° from the piston direc-
tional arrow.
Содержание HDX 500 2017
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