Push in by the piston
| Piston |
Piston ring | ring gap |
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Plastigauge
PISTON RING
(1)Check the clearance between the piston ring and ring groove. If the limit is exceeded, replace the ring or piston, or both.
Standard value:
No.1: 0.03 – 0.07 mm
No.2: 0.02 – 0.06 mm
Limit:
No.1: 0.1 mm
No.2: 0.1 mm
Install 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 thickness gauge.
If the ring gap is excessive, replace the piston ring. Standard value:
No.1: 0.25 – 0.40 mm (4G92, 4G93)
0.15– 0.30 mm (4G94)
No.2: 0.40 – 0.55 mm
Oil:
SOHC (4G92, 4G93): 0.20 – 0.60 mm
SOHC (4G94), DOHC: 0.10 – 0.35 mm
Limit:
No.1, No.2: 0.8 mm
Oil: 1.0 mm
CRANKSHAFT PIN OIL CLEARANCE (PLASTIGAUGE METHOD)
(1)Remove oil from crankshaft pin and connecting rod bearing.
(2)Cut the Plastigauge to the same length as the width of bearing and place it on crankshaft pin in parallel with its axis.
(3)Install the connecting rod cap carefully and tighten the bolts to specified torque.
(4)Carefully remove the connecting rod cap.
(5)Measure the width of the Plastigauge at its widest part by using a scale printed on the Plastigauge package.
Standard value: 0.02 – 0.05 mm
Limit: 0.1 mm
EMitsubishi Motors CorporationMar.2001 | Revised |