PISTON RING
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- Measure the clearance between each piston ring and its groove. If the limit is exceeded, replace the ring or piston, or both.
- No. 1 ring: 0.04 - 0.07 mm
- No. 2 ring: 0.02 - 0.06 mm
Standard values:
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- Install a piston ring or oil ring side rail into the cylinder bore and force it down with the head of a piston until the ring is at right angles to the cylinder wall. Measure the end gap with a thickness gauge.
- No. 1 ring: 0.25 - 0.35 mm
- No. 2 ring: 0.40 - 0.55 mm
- Oil ring: 0.10 - 0.40 mm
- No. 1 ring: 0.8 mm
- No. 2 ring: 0.8 mm
- Oil ring: 1.0 mm
NOTE: If the end gap is excessive, replace the piston ring.
Standard values:
Limits:
CRANKSHAFT PIN OIL CLEARANCE (PLASTIC GAUGE METHOD)
- Wipe off oil from the crankshaft pin and connecting rod bearing.
- Cut a piece of plastic gauge whose length is equivalent to the width of the bearing and place it on the crankshaft pin in parallel with its axis.
- Install the connecting rod cap carefully and tighten the nuts to the specified torque 20 ± 2 N·m + 90° to 94°.
- Remove the nuts, then remove the connecting rod cap carefully.
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- Measure the largest width of the crushed plastic gauge using the ruler printed on the bag of the plastic gauge.
Standard value: 0.03 -
0.05 mm
Limit: 0.1 mm