Mitsubishi 4G6 series Specifications download pdf (Page 97)

4G6

ENGINE

<1992>

Piston and

Connectina

Rod

lW97

5EN0066

f?StOn

ring

End

gap

f?StOn

ring

End

gap

6EN0541

INSPECTION

PISTON

(1)

Replace the piston if scratches or seizure is evident on its

surfaces (especially the thrust surface). Replace the piston

if it is cracked.

PISTON PIN

(1)

Insert the piston pin into the piston pin hole with a thumb.

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:

No.1

0.03

0.07 mm

(.0012

.0028

in.)

No.2 SOHC

0.02

0.06 mm

(.OOOS

.0024

in.)

No. 2 DOHC

0.03

0.07 mm

(.0012

.0028

in.)

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:

No.

0.25

0.40 mm

(.0098

-0157

in.)

No. 2

0.35

0.50 mm

(.0138

.0197

in.)

4661

0.20

0.35 mm

LOO79

.0138

in.)

4663

SOHC

0.45

0.60 mm

(.0177

.0236

in.)

4663

DOHC

0.20

0.40 mm

(.0079

.0157

in.)

4664

Oil

0.20

0.70 mm

LOO79

.0276

in.)

Limit:

No. 1, No. 2

0.8 mm

(.031

in.)

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.

1 2 ... 92 93 94 95 96 97 98 99 100 101 102 ... 107 108

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Mitsubishi 4G6 series Specifications Page 97

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