Mitsubishi 4g63 Service Manual page 61

Push in by
piston
Piston ring
2. Install a piston ring or oil ring side rail into the
cylinder bore and force it down with the head of a
piston until the ring is at right angles to the
cylinder wall. Measure the end gap with a
thickness gauge.
NOTE: If the end gap is excessive, replace the
piston ring.
Standard values:
No. 1 ring: 0.20 − 0.30 mm
No. 2 ring: 0.30 − 0.45 mm
Oil ring: 0.10 − 0.40 mm
Limits:
No. 1 ring: 0.8 mm
No. 2 ring: 0.8 mm
Oil ring: 1.0 mm
ENGINE OVERHAUL <4G63-Turbo>
PISTON AND CONNECTING ROD
Piston ring gap
AK301481AD
CRANKSHAFT PIN OIL CLEARANCE
(PLASTIC GAUGE METHOD)
1. Wipe off oil from the crankshaft pin and
connecting rod bearing.
2. Cut a piece of plastic gauge whose length is
equivalent to the width of the bearing and place it
on the crankshaft pin in parallel with its axis.
3. Install the connecting rod cap carefully and tighten
the nuts to the specified torque 20 ± 2 N⋅m + 90°
to 94°.
4. Remove the nuts, then remove the connecting rod
cap carefully.
5. Measure the largest width of the crushed plastic
gauge using the ruler printed on the bag of the
plastic gauge.
Standard value: 0.03 − 0.05 mm
Limit: 0.1 mm
11D-61
AK202848