Inspecting Piston And Piston Ring; Inspecting Crankcase And Crankshaft - Echo CS-310 Service Manual

CS-310

8-7 Inspecting piston and piston ring

8-8 Inspecting crankcase and crankshaft

ENGINE
A
C
B
1. Inspect piston ring and replace it if broken or
scored, or if it exceeds service limits (Refer to
"1-5").
2. Inspect piston crown. Clean with fi ne sand pa-
per, oil stone, or soft cleaning brush (A) if carbon is
found.
3. Inspect top land, ring groove and skirt. Clean
them with soft cleaning brush (A) if carbon is
found.
NOTE: Do not use square end of broken piston
ring when cleaning piston ring groove, otherwise
piston ring groove might be damaged.
4. Remove snap rings from both sides of piston
pin.
5. Push piston pin out from piston.
NOTE: If piston pin is tight, use piston pin tool
897702-30131 (B) with adapter (C) stamped "8" on
an end.
6. Inspect needle bearing and washers, and re-
place if wear or discoloration is noted.
1. Clean crankcase. Replace as a set of cylinder
and crankcase if damaged.
2. Completely remove sealant residue on mat-
ing surfaces and bearing bore of crankcase using
wooden or plastic scraper, or chemical gasket re-
mover.
3. Measure crankshaft runout and replace if it
exceeds service limits (Refer to "1-5"). Replace
crankshaft if the connecting rod bearing is rough,
damaged, or discolored.
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