45
SRM-420ES, SRM-420TES
T410S, B410S
T410TS, B410TS
ENGINE
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B
C
A
D
6-6 Inspecting piston and piston ring
1. Inspect piston rings (A) and replace them if bro-
ken, scored, or exceeded service limits (Refer to
“1-5 Service limits”).
2. Inspect piston crown (B). Clean it with fi ne sand
paper, oil stone, and soft cleaning brush (C) if car-
bon is found.
3. Inspect top land (D), ring grooves and skirt (E).
Clean them with soft cleaning brush (C) 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 (F) from both sides of piston
pin.
5. Push piston pin out from piston with piston hold-
er 897719-02830 (G).
NOTE:
If piston pin is tight, use piston pin tool
897702-30131 (H) with adapter (J) stamped “10”
on an end.
6. Inspect piston pin, needle bearing and piston
spacers, and replace them if wear or discoloration
is noted.
E
G
J
H
F
