Mitsubishi 4G1 Service Manual page 221

INSPECTION
PISTON
surfaces (especially the thrust surface). Replace the piston
if it is cracked.
PISTON PIN
You should feel a slight resistance. Replace the piston pin if
it can be easily inserted or there is an excessive play.
(2) The piston and piston pin must be replaced as an assembly.
PISTON RING
(1) Check the piston ring for damage, excessive wear, and
breakage and replace if defects are evident. If the piston
has been replaced with a new one, the piston rings must
also be replaced with new ones.
(2) Check for the clearance between the piston ring and ring
groove. If the limit is exceeded, replace the ring or piston, or
both.
Standard value:
0.03 - 0.07 mm (.0012 - .0028 in.)
No. 2 DOHC
Limit: 0.1 mm (.004 in.)
(3) Install the piston ring into the cylinder bore. Force it down
with a piston, its crown being in contact with the ring, to
correctly position it at right angles to the cylinder wall. Then,
measure the end gap with a feeler gauge.
If the ring gap is excessive, replace the piston ring.
Standard value:
0.25 - 0.40 mm (.0098 - -0157 in.)
No. 1
0.35 - 0.50 mm
No. 2
0.20 - 0.35 mm
0.45 - 0.60 mm
0.20 - 0.40 mm
0 . 2 0 0.70 m m LOO79 - .0276 in.)
Oil
Limit:
No. 1, No. 2
Oil 1.0 mm 1.039 in.)
CRANKSHAFT PIN OIL CLEARANCE
(PLASTIC GAUGE METHOD)
(1) Remove oil from crankshaft pin and connecting rod bearing.
(2) Cut the plastic gauge to the same length as the width of
bearing and place it on crankshaft pin in parallel with its axis.
0.02 - 0.06 mm (.OOOS - .0024 in.)
0.03 - 0.07 mm (.0012 - .0028 in.)
0.8 mm (.031 in.)