Mitsubishi 4G9 series

4G9 ENGINE (E-W) -
Piston and Connecting Rod
11A-11-3
PWEE9502
E
May 1995Mitsubishi Motors Corporation
INSTALLATION SERVICE POINTS
"
A
A
PISTON PIN INSTALLATION
(1) Measure the following dimensions of the piston, piston
pin and connecting rod.
A: Piston pin insertion hole length
B: Distance between piston bosses
C: Piston pin length
D: Connecting rod small end width
(2) Calculate the following formula by substituting the
measured value.
L = ((A - C) - (B - D))/2
(3) Insert the Push Rod (special tool) into the piston pin and
attach the guide A to the push rod end.
(4) Assemble t he connecting rod in the piston with their front
marks facing the same direction.
(5) Apply engine oil to the entire periphery of the piston pin.
(6) Insert the piston pin, push rod and guide A assembly
having assembled in step (3) from the guide A side into
the piston pin hole on the front marked side.
(7) Screw the guide B into the guide A until the gap between
both guides amounts to the value L obtained in step
(2) plus 3 mm.
(8) Place the piston and connecting rod assembly onto the
piston setting base with the front marks directed upward.
(9) Press-fit th e piston pin using a press. If the press-fitting
force required is less than the standard value, replace
the piston and piston pin set or/and the connecting rod.
Standard value: 4,500 - 14,700 N
D
C
Connecting rod
Piston
Piston pin
B
A
3mm+L
Guide B
Guide A
Push rod
Piston pin
Front
mark
Front mark
Guide A
Base
Guide B