Mitsubishi Motors 4G9 - Manual (Page 156)

www.mivec.co.nz
4G9 ENGINE (E–W) – Piston and Connecting Rod
11A-11-8
PWEE9502
E
May 1995 Mitsubishi Motors Corporation
INSPECTION
11300850074
PISTON RING
(1) Check the clearance between the piston ring and ring
groove. If the limit is exceeded, replace the ring or piston,
or both.
Standard value:
No.1: 0.03 – 0.07 mm
No.2: 0.02 – 0.06 mm
Limit:
No.1: 0.1 mm
No.2: 0.1 mm
Install the piston ring into the cylinder bore. Force the
ring down with a piston, the piston 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
thickness gauge.
If the ring gap is excessive, replace the piston ring.
Standard value:
No.1: 0.25 – 0.40 mm (4G92, 4G93)
0.15 – 0.30 mm (4G94)
No.2: 0.40 – 0.55 mm
Oil:
SOHC (4G92, 4G93): 0.20 – 0.60 mm
SOHC (4G94), DOHC: 0.10 – 0.35 mm
Limit:
No.1, No.2: 0.8 mm
Oil: 1.0 mm
CRANKSHAFT PIN OIL CLEARANCE (PLASTIGAUGE
METHOD)
(1) Remove oil from crankshaft pin and connecting rod
bearing.
(2) Cut the Plastigauge to the same length as the width of
bearing and place it on crankshaft pin in parallel with
its axis.
(3) Install the connecting rod cap carefully and tighten the
bolts to specified torque.
(4) Carefully remove the connecting rod cap.
(5) Measure the width of the Plastigauge at its widest part
by using a scale printed on the Plastigauge package.
Standard value: 0.02 – 0.05 mm
Limit: 0.1 mm
PWEE9502-I
E
Mar. 2001 Mitsubishi Motors Corporation Revised
Push in by
the piston
Piston ring
Piston
ring gap
Plastigauge