Echo CS-271T - Page 57

ENGINE
CS-271T
55
8-6 Inspectingcylinder
1. Remove 4 bolts securing crankcase.
2. Gently tap both crankshaft ends using plastic
mallet to remove lower crankcase with crankshaft
and piston assembly.
3. Inspect cylinder combustion chamber and clean
with a plastic or wooden scraper if carbon is found.
NOTE: Do not use metal tools, or damage to cylin-
der wall may result.
4. Inspect cylinder wall and replace with new one if
plating is worn, peeled away, scored or exposing
cylinder base metal.
8-7 Inspectingpistonandpistonring
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 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
89770230131 (B) with adapter (C) stamped “8” on
an end.
6. Inspect needle bearing and washers, and re-
place if wear or discoloration is noted.
B
C
A