Mitsubishi S4S Service Manual page 95

4.2 Inspeetion
Crankcase
(1) Gasket contact surface
Measure flatness of the gasket contact (top)
surface with a heavy accurate straight edge and
feeler gages, in three positions lengthwise, two
crosswise and two widthwise, as shown in the
illustration. If flatness exceeds the repair limit,
grind the crankcase.
Unit: mm [in.]
Item
Assembly Repair
Standard
Limit
Flatness of gasket 0.05 [0.0020] 0.20
contact surface or less [0.0079]
ENGINE MAIN PARTS
Checking crankcase f1atness
(2) Inside diameter of cylinders
(a) Measure the inside diameter of the cylinder
at the top (ridged portion),middle and bottom,
each in two directions parallel and transverse
to the crankshaft, as shown in the illustration.
Unit: mm [in.]
Item
Assembly Repair Service
Standard Limit Limit
Inside
94.000
diameter of
to 94.035 94.200 94.700
cylinder
[3.7008 [3.7087] [3.7283]
to 3.7022]
0.01
Circularity [0.0004]
or less
0.015
Taper [0.0006]
or less
(b) If the cylinder has reached the repair limit,
with the wear far less than the service limit,
bore it to 0.25 mm [0.0098 in.] or 0.5 mm
[0.0197
in.]
oversize.
(c) Hone the cylinder within an accuracy of 0.035
mm [0.00138 in.], and use the piston and
piston rings of the same oversize.
Measuring diagram
E9 ~ ~
«) lr)
7 -
sti
- 0
- oe
~]
Measuring cylinder
Unit: mm [in.]
7-33