Mitsubishi 4G1 series, Service Manual

Page: 117 / 522

ENGINE Piston and Connecting Rod
1
Make certain the piston
floats during installation
1
1
REASSEMBLY SERVICE POINTS
PISTON PIN INSTALLATION
Install the piston and connecting rod as follows, using the
special tools
(2) Thread the stop plug approximately half way into the
bottom of the receiving tube.
(3) Select the piston pin guide that will pass through the piston
and the connecting rod. Install spring, spacer, and guide
into the receiving tube.
(4) With the connecting rod removed from the piston, insert
the piston pin into the piston bore. Carefully measure the
projection amount of the pin that protrudes equally from
both sides of the piston. Record this measurement for
future use.
(5) Place the connecting rod and piston onto the anvil. The
spring loaded piston guide will pass through the piston and
connecting rod and align them. Lubricate pin and insert it
into the piston.
(6) Attach the piston pin pusher to the piston pin and push the
pin through the connecting rod until the pin protrudes same
distance measured and recorded above in step 4:
NOTE
The piston must be free to float during installation; check
frequently.
(7) Apply hydraulic pressure to the pin and adjust the stop plug
until it comes in contact with the spacer.
(8) Remove the piston and pin assembly from the anvil and
check the piston pin to make sure it is centered. If it is not
centered, shift the stop plug up or down to obtain proper
centering. The pin stop is now set for any remaining
pistons.
NOTE
If the required installation load does not meet the specifica-
tion, replace the piston pin and/or connecting rod.
value: 5,000 15,000 (1,100 3,300
OIL RING INSTALLATION
(1) First, install the oil ring spacer in the piston ring groove.
Next, install the upper side rail and then the lower side rail.
Both upper and lower side rails may be installed with their
either side facing up.
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