Cylinder Block; Boring Cylinder - Mitsubishi 4G6 series Workshop Manual

11A-12-6
4G6 ENGINE (E - W) -
E
Mitsubishi Motors Corporation
Crankshaft, Flywheel and Drive Plate

CYLINDER BLOCK

(1) Visually check for scratches, rust, and corrosion.
(2) Using a straightedge and feeler gauge, check the block
(3) If the distortion is excessive, correct within the allowable
(4) Check cylinder walls for scratches and seizure. If defects
(5) Using cylinder gauge, measure the cylinder bore and

BORING CYLINDER

(1) Oversize pistons to be used should be determined on
(2) Measure outside diameter of piston to be used. Measure
(3) Based on the measured piston O.D. calculate boring finish
Aug. 1998
Use also a flaw detecting agent for the check. If defects
are evident, correct, or replace.
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
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
are evident, correct (bored to oversize) or replace.
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
the basis of the largest bore cylinder.
Piston size identification
Size
0.50 O.S.
1.00 O.S.
NOTE
Size mark is stamped on the piston top.
it in thrust direction as shown.
dimension.
Boring finish dimension = Piston O.D. + (clearance
between piston O.D. and cylinder) - 0.02 mm
(honing margin)
PWEE9616-A
Identification mark
0.50
1.00
Revised