Mitsubishi 4G1 series, Service Manual

Page: 394 / 522

ENGINE
Piston and Connecting Rod
Push in by piston
Piston ring’
ring gap
INSPECTION
PISTON
(1) Replace the piston if scratches or seizure is evident on its
surfaces (especially the thrust surface). Replace the piston
if it is cracked.
PISTON PIN
(1) the piston pin into the piston pin hole with a thumb.
You should feel a slight resistance. Replace the piston pin if
it can be easily inserted or there is an excessive play.
(2) The piston and piston pin must be replaced as an assembly.
PISTON RING
(1) Check the piston ring for damage, excessive wear, and
breakage and replace if defects are evident. If the piston
has been replaced with a new one, the piston rings must
also be replaced with new ones.
(2) Check for clearance between the piston ring and ring
groove. If the limit is exceeded, replace the ring or piston, or
both.
Standard value:
No. 1
and
0.03 0.07
m m in.)
MONTERO and TRUCK
0.05
0.09 mm in.)
No.
2
0.02 0.06
m m in.)
Limit: 0.1 mm in.)
(3) Insert the piston ring into the cylinder bore. Force the ring
down with a piston, the piston crown being in contact with
the ring, to correctly position it at right angles to the cylinder
wall. Then, measure the end gap with a feeler gauge.
If the ring gap is excessive, replace the piston ring.
Standard value:
No. 1
0.30 0.45
m m in.)
No.
2
DIAMANTE and
0.45 0.60
m m in.)
MONTERO and TRUCK
0.25 0.45
m m in.)
Oil
DIAMANTE and
0.20 0.60
m m in.)
MONTERO and TRUCK
0 . 2 0 0.70
in.)
Limit:
No. 1, No. 2
0.8
mm in.)
Oil
1.0
mm in.)
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