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4D68 ENGINE (E- W) -
Pistons and Connecting Rods
11A-11-5
INSPECTION
PISTON RING
(1) Check for side clearance.
If the limit is exceeded, replace the ring or piston, or both.
(2) In the case of semi-keystone type piston rings, check
the ring to ring groove clearance as illustrated.
Standard value:
No. 1 0.05 - 0.07 mm
No. 2 0.05 - 0.07 mm
Limit:
No. 1 0.15 mm
No. 2 0.15 mm
(3) Insert the piston ring into the cylinder bore. Force it down
with a piston, its 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 thickness gauge. If
the end ga p is excessively, replace the piston ring.
Standard value:
No. 1 0.20 - 0.32 mm
No. 2 0.35 - 0.50 mm
Oil 0.10 - 0.30 mm
Limit: 0.8 mm
CRANKSHAFT PIN OIL CLEARANCE (PLASTIC GAUGE
METHOD)
(1) Remove oil from the crankshaft pin and the connecting
rod bearing.
(2) Cut the plastic gauge to the same length as the width
of the bearing and place it o n the crankshaft pin in parallel
with its axis.
(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 scale printed on the plastic gauge package.
Standard value: 0.02 - 0.05 mm
Limit: 0.1 mm
PWEE9609
E
Dec. 1996Mitsubishi Motors Corporation
5EN0066
DEN259
Piston
Thickness gauge
6EN0548
Press down ring
with piston
Piston ring
End gap
1EN0246