Mitsubishi S4S Service Manual page 96

ENGINE MAIN PARTS
(d) If any cylinder is unevenly worn, determine
the oversize on the basis of the maximum wear
noted to ensure perfect roundness in the
oversized bore.
..----------J[
NOrE
JI----------..,
(a) Refinish all cylinders to the same oversize.
(b) If the cylinder is found in good condition,
with the wear far less than the repair limit,
replace the piston ring and ream off "ridge"
at the top of the cylinder. Hone the bore if
necessary.
-------
Ridge-reaming cylinder
Pistons and piston rings
(l) Measuring piston diameter
(a) Measure the diameter ofthe piston at skirt in
the direction transverse to the piston pin with
a micrometer, as shown in the illustration. If
the piston is wom beyond the service limit,
replace it.
Measuring diagram
~
Measuring piston diameter
Service
Limit
Unit: mm [in.]
Assembly
Standard
Item
FRONT mark
94.270
[3.7114]
93.770
[3.6917]
94.020
[3.7016]
5 g [0.18 oz]
or less
94.455 to 94.485
[3.7187 to 3.7199]
93,955
to
93.985
[3.6990
to
3.7002]
94.205 to 94.235
[3.7089 to 3.7100]
Standard
0.25
[0.0098]
oversize
0.50
[0.0197]
oversize
Piston weight
difference per :
engine
<IJ
2
Ë
o:l
:a
~
:9
~ 1----+---------+-----1
<IJ . -
'Sc
o
0
(b) When installing the piston, make sure the
weight difference of the piston per engine is
in the assembly standard.
FRONT mark and WEIGHT mark on piston
(direct injection type)
7-34