Mitsubishi 4G9 series Specifications download pdf (Page 156)

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4G9 ENGINE (E–W) – Piston and Connecting Rod

11A-11-8

PWEE9502

May 1995Mitsubishi 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

Mar. 2001Mitsubishi Motors Corporation Revised

Push in by

the piston

Piston ring

Piston

ring gap

Plastigauge

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Mitsubishi 4G9 series Specifications Page 156

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