Mitsubishi 4G6 series Specifications download pdf (Page 104)

IIC-104

4G6

ENGINE

<1992>

Crankshaft.

Flvwheel

and Drive Plate

(4) Check cylinder walls for scratches and seizure. If defects

are evident, correct (rebore to an oversize) or replace.

(5) Using a cylinder gauge, measure the cylinder bore and

cylindricity. If worn badly, correct the cylinder to an oversize

and replace the piston and piston rings. Measure at the

points shown in illustration.

Standard value:

Cylinder I.D.

4661

82.30

82.33 mm (3.2402

3.2413 in.)

4663

85.00

85.03 mm (3.3465

3.3476 in.)

4G64

86.50

86.53 mm (3.4055

3.4067 in.)

Cylindricity

0.01 mm

(0004

in.)

BORING CYLINDER

(1)

Oversize pistons to be used should be determined on the

basis of the largest bore cylinder.

Piston size identification

Size

Identification mark

0.25

(.Ol

in.) O.S.

0.25

0.50 mm (.02 in.) O.S.

0.50

I .

0.75

(.03

in.) O.S.

0.75

.OO

(.04

in.)

OS.

1.00

NOTE

Size mark is stamped on the piston top.

Piston

O.D.

)

Thrust

direction

6EN0554

(2) Measure outside diameter of piston to be used. Measure it

in thrust direction as shown.

(3) Based on the measured piston O.D. calculate the boring

finish dimension.

Boring finish dimension

Piston O.D.

(clearance between piston 0-D. and cylinder)

0.02 mm

(0008

in.) (honing margin)

(4) Bore all cylinders to the calculated boring finish dimension.

Caution

To prevent distortion that may result from temperature

rise during honing, bore cylinders, working from No. 2

to No. 4 to No. 1 to No. 3.

(5) Hone to final finish dimension (piston O.D.

clearance

between piston O.D. and cylinder).

(6) Check the clearance between piston and cylinder.

Clearance between piston and cylinder:

4663

SOHC

0.01

0.03 mm

(.0004

.0012

in.)

4663

DOHC T/C

0.03

0.05 mm

(.0012

.0020

in.)

4661,

4063

DOHC,

4664

0.02

0.04 mm

(0008

.0016

in.)

NOTE

When boring cylinders, finish all of four cylinders to the

same oversize. Do not bore only one cylinder to an oversize.

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Mitsubishi 4G6 series Specifications Page 104

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