Mitsubishi 4G1 Service Manual page 58

1 IA-50
INSPECTION
CRANKSHAFT JOURNAL OIL CLEARANCE (PLASTIC
GAUGE METHOD)
(1) Remove oil from the crankshaft journal and the crankshaft
bearing.
(2) Install the crankshaft.
(3) Cut the plastic gauge to the same length as the width of
bearing and place it on the journal in parallel with its axis.
(4) Install the crankshaft bearing cap carefully and tighten the
bolts to the specified torque.
(5) Carefully remove the crankshaft bearing cap.
(6) Measure the width of the plastic gauge at its widest part by
using a scale printed on the plastic gauge package.
Standard value: 0.02 - 0.05 mm (.OOOS - .0020 in.)
Limit: 0.1 mm (.004 in.)
CYLINDER BLOCK
surface for warpage. Make sure thagthe surface is free
from gasket chips and other foreignimatters.
Standard value: 0.05 mm (.002 in.)
Limit: 0.1 mm (004 in.)
(2) If the distortion is excessive, correct within the allowable
limit or replace.
Grinding limit: 0.2 mm (.008 in.)
The total resurfacing depth of both cylinder block
and mating cylinder head is 0.2 mm (008 in.) at
maximum.
Cylinder block height (When new)?
255.9 - 256.1 mm (10.075 - lO~iO88 in.)
(3) Check cylinder walls for scratches and seizure. If defects
are evident, correct (rebore to an oversize) or replace.
(4) Using 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.
Cylindricity: 0.01 mm (0004 in.) or less
TSB Revisipn
m m
75.50 - 75.53
(2.9724 - 2.9736 in.)