Mitsubishi 4G1 series, Service Manual

Page: 401 / 522

ENGINE
Crankshaft, Flywheel and
Drive Plate
INSPECTION
CYLINDER BLOCK
for scratches, rust, and corrosion. Use
flaw detecting agent for the check. If defects are evident,
correct, or replace.
Using a straightedge and feeler gauge, check the block top
surface for Make sure that the surface is free
from gasket chips and other foreign matter.
Standard value: 0.05 mm in.)
Limit: 0.1 mm in.)
If the distortion is excessive, correct within the allowable
limit or replace.
Grinding limit: 0.2 mm in.)
The total thickness of the stock allowed to be
removed from cylinder block and mating cylinder
head is 0.2 mm
in.) at maximum.
Cylinder block height (when new): 210.5 mm (8.29 in.)
-
direction
(4) Check the 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 by boring the cylinders to
an oversize and replace pistons and piston rings. Measure
at the points shown in the illustration.
Standard value:
Cylinder I.D.: 91.10 91.13 mm (3.5866 3.5878
in.)
Cylindricity: 0.01 in.)
BORING CYLINDER
Oversize pistons to be used should be determined on the
basis of the largest bore cylinder.
Piston size identification
NOTE
Size mark is stamped on the piston top.
(2) Measure the outside diameter of the piston to be used.
Measure it in the 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 O.D. and cylinder) 0.02 mm
in.)
(honing margin)
TSB Revision