Service Manual

CRANKSHAFT
GEAR PULLER
E MARKS
WHEN
ING TIMING
EARS
FIGURE 11. TIMING GEAR REMOVAL AND INSTALLATION
PISTONS AND CONNECTING RODS
Observe the following procedure when removing pistons
and connecting
rods from the engine.
1. Drain oil.
2. Remove the cylinder head and oil base pan from the
engine.
3. Remove the ridge from the top of each cylinder with
a ridge reamer before attempting piston removal
(Figure
12).
Forcing the piston from the
cylinder before reaming may
cause damage to the piston lands and break rings.
FIGURE 12. REMOVING RIDGE FROM CYLINDER
4. Turn the crankshaft until the piston is at the bottom
of
its stroke and remove the connecting rod nuts. Lift
the rod bearing cap from the rod and push the rod
and piston assembly out through the top of the
cylinder using a hammer handle.
Do not scratch the
crankpin and cylinder wall when removing the
piston and
rod.
5. Mark each piston and rod assembly so they can be
returned to their respective cylinders after overhaul.
Keep connecting rod bearing caps with their
respective
rods.
6. Remove the piston rings from the piston with a
piston ring spreader (Figure 13). Remove the piston
pin retainer and push the piston pin out
FIGURE 13. REMOVING PISTON RINGS
7. Remove dirt and deposits from the piston surfaces
with an approved cleaning solvent Clean the piston
ring grooves with a groove cleaner
or the end of a
piston ring filed to a sharp point (Figure
14). Care
must be taken not to remove metal from the groove
sides.
pistions. There materials will cause piston damage.
8. Clean the connecting rods in solvent. Blow out all
passages with compressed air.
P224
Engines that have been filled with 0.005 inch (0.1 3 mm)
oversize pistons at the factory are identified by the letter
E after the serial number. Number is stamped on the
cylinder block and on the unit nameplate.
10-8