Mitsubishi 4G1 Service Manual page 518

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1
Thrust
direction
Piston O.D.
BORING CYLINDER
(1) Oversize pistons to be used should be determined on the
basis of the largest bore cylinder.
Piston size identification
NOTE
Size mark is stamped on piston top.
(2) Measure outside diameter of piston to be used. Measure it
in thrust direction as shown.
(3) Based on measured piston O.D. calculate boring finish
dimension.
Boring finish dimension = Piston
(clearance between piston O.D. and cylinder) -
mm in.) (honing margin)
0.02
(4) Bore all cylinders to calculated boring finish dimension.
Caution
To prevent distortion that may result from temperature
rise during honing, bore cylinders, working from No. 2
to No. 4 to No. 1 to No. 3.
(5) Hone to final finish dimension (piston O.D. + clearance
between piston O.D. and cylinder),
(6) Check clearance between piston and cylinder.
Clearance between piston and cylinder:
Non-T/C
0.02 - 0.04
T/C
0.03 - 0.05
NOTE
When boring cylinders, finish all of four cylinders to same
oversize. Do not bore only one cylinder to an oversize.
O.D. +
m m (0008 - .0016 in.)
m m (.0012 - .0020 in.)
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