CS-350WES
48
SAW CHAIN LUBRICATION SYSTEM
7-7 Checking piston and piston ring
1. Check piston ring and replace it if broken, scored,
or exceed service limits. Refer to 1-5.
2. Inspect piston crown and ring groove, and clean
with fine sand paper, oil stone, or ring groove
cleaning tool if carbon is deposited.
NOTE: The squared end of a broken piston ring (A)
can be used to clean the groove.
3. Remove snap rings from both sides of piston pin.
4. Push piston pin out from piston.
NOTE: If piston pin is tight, heat piston with a heating
gun, a heat lamp, or a suitable heater and/or use
piston pin tool 897702-30131 with adapter stamped
ā8ā on an end.
5. Inspect needle bearing and spacers, and replace
if wear or discoloration is noted.
7-8 Checking crankcase and crankshaft
1. Clean lower crankcase. Replace as a set of upper
and lower crankcase if damaged.
2. Completely remove sealant residue on mating
surfaces and bearing bore of crankcase using
wooden or plastic scraper, or chemical gasket
remover.
3. Measure crankshaft runout and replace if it
exceeds service limits. Replace crankshaft if the
connecting rod bearing is rough, damaged, or
discolored.
1K264
(A)