Mitsubishi 4G6 Series 1991 Specifications download pdf (Page 106)

4G6 ENGINE (E-W) -

Crankshaft, Flywheel and Drive Plate

11A-12-6

CYLINDER BLOCK

(1) Visually check for scratches, rust, and corrosion.

Use also a flaw detecting agent for the check. If defects

are evident, correct, or replace.

(2) Using a straightedge and feeler gauge, check the block

top surface for warpage. Make sure that the surface is

free from gasket chips and other foreign matter.

Standard value: 0.05 mm

Limit: 0.1 mm

(3) If the distortion is excessive, correct within the allowable

limit or replace.

Grinding limit: 0.2 mm

Includes/combined with cylinder head grinding

Cylinder block height (when new):

4G63 284 mm

4G64 290 mm

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

are evident, correct (bored to oversize) or replace.

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

cylindricity. If worn badly, correct cylinder to an oversize

and replace piston and piston rings. Measure at the points

shown in illustration.

Standard value:

Cylinder I.D.

4G63 85.00 - 85.03 mm

4G64 86.50 - 86.53 mm

Cylindricity 0.01 mm or less

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

0.50 O.S. 0.50

1.00 O.S. 1.00

NOTE

Size mark is stamped on the piston top.

(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 boring finish

dimension.

Boring finish dimension = Piston O.D. + (clearance

between piston O.D. and cylinder) - 0.02 mm

(honing margin)

RevisedPWEE9616-A

Aug. 1998Mitsubishi Motors Corporation

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Mitsubishi 4G6 Series 1991 Specifications Page 106

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