3-15
3
CC400D
2. Remove each ring by working it toward the top 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 piston 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.
CC995
Measuring Piston Pin, Connecting
Rod Small End, and Piston-Pin Bore
1. Measure the piston pin outside diameter at each
end and in the center. If measurement exceeds
specifications, the piston pin must be replaced.
ATV-1070
2. Inspect and measure the connecting rod small end.
If the measurement exceeds specifications, the
connecting rod must be replaced (see Center
Crankcase Components in this section).
3. Insert an inside dial indicator into the piston-pin
bore. Take two measurements to ensure accuracy.
The diameter must not exceed specifications. If the
diameter exceeds specifications, the piston must
be replaced.
ATV-1069
Measuring Piston Skirt/
Cylinder Clearance
1. Measure the cylinder front to back in six places.
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.
For Discount Arctic Cat Parts Call 606-678-9623 or 606-561-4983
www.mymowerparts.com