Mitsubishi 4G1 Service Manual page 116

Piston king
INSPECTION
PISTON
(1) Replace the piston if scratches or seizure is evident on its
surfaces (especially the thrust surfa$e). Replace the piston
if it is cracked.
PISTON PIN
(1) Insert the piston pin into the piston #in hole with a thumb.
You should feel a slight resistance. Replace the piston pin if
it can be easily inserted or there it an excessive play.
(2) The piston and piston pin must be replaced as an assembly.
PISTON RING
If the limit is exceeded, replace the nng or piston, or both.
Standard value:
No. 1
No. 2
Limit: 0.1 mm (.004 in.)
(2) Insert the piston ring into the cylinder bore. Force it down
with a piston, the piston crown bei
ring, to correctly position it at right
wall. Then, measure the end gap witti a thickness gauge. If
the end gap is excessive, replace ihe piston ring.
Standard value:
No. 1
No. 2
Oil 0.20 - 0.70 m
Limit:
0.8 mm (.031 in.)
1.0 mm (.039 in.)
CRANKSHAFT PIN OIL CLEARANCE (PLASTIC GAUGE
METHOD)
(2) Cut the plastic gauge.to the same I
bearing and place it on crankshaft pin
(3) Install the connecting rod cap carefully and tighten the bolts
to the specified torque.
(4) Carefully remove the connecting rod cap.
(5) 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 (.OOOp - .0020 in.)
Limit: 0.1 mm (.0039 in.)
TSB
Revision
0.05 - 0.09 mm (.00_20 - .0035 in.)
0.02 - 0.06 mm (.0068 - .0024 in.)
0.30
0.20 - 0.35 mm
No. 1,
Oil
in contact with the
gles to the cylinder
2
gth as the width of