Service Manual

PISTON, PISTON PIN, RiNGS,
CONNECTING ROD
Disassembly
CAUTION Improper piston removal can cause
piston damage.
Use a rldge reamer to remove
cylinder ridge before removing plston.
Refer to Figure 11-19. Unscrew the connecting rod
screws and remove the connecting rod cap. Turn
the crankshaft
so the piston is at top dead center.
Pull the piston and connecting rod out of the cylin-
der liner. Make a mark on the piston on the same
side as the machined surface on the connecting
rod.
CT-1097a-1097
FIGURE 11-19. PISTON MARKING
Refer to Figure 11-20. Remove rings from piston by
using a ring tool. Remove the piston pin snap ring
and push out the piston pin.
11-12
PISTON PIN
SNAP RING
FIGURE 11-20, PISTON ASSEMBLY
Piston Inspection
CAUTION Improper piston cleaning can cause
piston damage.
Do not use a caustic cleaning
solvent
or wire brush for cleaning pistons.
Follow the procedures given below when inspecting
pistons and connecting rods.
Piston Inspection:
1. Inspect the piston forfractures at the ring lands,
skirts and pin bosses. Check for wear at the
ring lands using a new ring and feeler gauge
(Figure
11-23). Replace the piston when the
side clearance of the top compression ring
reaches that specified in
Dimensions and
Clearances.
2. Replace a piston showing signs of scuffing,
scoring, worn ring lands, fractures or damage
from preignition. Excessive piston wear near
the edge
of the top ring land indicates preigni-
tion.