G424 Service Manual Base Engine Service Procedure157
A7EN0432
7EN0433
7EN0391
Installation Service Points
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
(2) Obtain dimension L (to be used later) from the above
measurements by using by following formula.
L=
(A
- C) - (B - D)
2
(3) Insert the special tool, Push Rod, into the piston pin and
attach the guide A to the push rod end.
(4) Assemble the 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 stop (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 (0.12 in.)
(8) Place the piston onto the piston setting base with the
front marks directed upward.
(9) Press-fit the 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: 750 to 1750 kgf
(1654 to 3859 lbf)
[7350 to 17160 N]
Piston
Connecting rod
Piston pin
Guide B
Guide A
Push rod
Guide A
Base
Guide B
Front mark
Piston pin
Front mark
3mm (0.12in) +L2
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