Piston Ring Instpection; Crankshaft Pin Oil Clearance (Plastigauge Method) - Mitsubishi 4G9 User Manual

11A-11-8
4G9 ENGINE (E–W) –
Push in by
the piston
Piston
ring gap
Piston ring
Plastigauge
E
E
Mitsubishi Motors Corporation
Mitsubishi Motors Corporation
INSPECTION
PISTON RING
(1) Check the clearance between the piston ring and ring
CRANKSHAFT PIN OIL CLEARANCE (PLASTIGAUGE
METHOD)
(1) Remove oil from crankshaft pin and connecting rod
(2) Cut the Plastigauge to the same length as the width of
(3) Install the connecting rod cap carefully and tighten the
(4) Carefully remove the connecting rod cap.
(5) Measure the width of the Plastigauge at its widest part
May 1995
Mar. 2001
Piston and Connecting Rod
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
bearing.
bearing and place it on crankshaft pin in parallel with
its axis.
bolts to specified torque.
by using a scale printed on the Plastigauge package.
Standard value: 0.02 – 0.05 mm
Limit: 0.1 mm
PWEE9502
PWEE9502-I
11300850074
Revised