Piston Ring, Engine

PISTON RING SIDE CLEARANCE





^ Measure the side clearance of piston ring and piston ring groove with feeler gauge.
Standard:
M/T models
Top ring: 0.045 - 0.080 mm (0.0018 - 0.0031 in)
2nd ring: 0.030 - 0.070 mm (0.0012 - 0.0028 in)
Oil ring: 0.065 - 0.135 mm (0.0026 - 0.0053 in)
A/T models
Top ring: 0.045 - 0.080 mm (0.0018 - 0.0031 in)
2nd ring: 0.030 - 0.070 mm (0.0012 - 0.0028 in)
Oil ring: 0.065 - 0.135 mm (0.0026 - 0.0053 in)
Limit:
M/T models
Top ring: 0.11 mm (0.0043 in)
2nd ring: 0.10 mm (0.004 in)
Oil ring: 0.17 mm (0.0067 in)
A/T models
Top ring: 0.11 mm (0.0043 in)
2nd ring: 0.10 mm (0.004 in)
Oil ring: -
^ If the measured value exceeds the limit, replace piston ring, and measure again. If it still exceeds the limit, replace piston also.

PISTON RING END GAP





^ Make sure that cylinder bore inner diameter is within specification.
^ Lubricate with new engine oil to piston and piston ring, and then insert piston ring until middle of cylinder with piston, and measure the piston ring end gap with feeler gauge.
Standard:
M/T models
Top ring: 0.23 - 0.33 mm (0.0091 - 0.0130 in)
2nd ring: 0.23 - 0.33 mm (0.0091 - 0.0130 in)
Oil ring: 0.20 - 0.50 mm (0.008 - 0.020 in)
A/T models
Top ring: 0.23 - 0.33 mm (0.0091 - 0.0130 in)
2nd ring: 0.33 - 0.48 mm (0.0130 - 0.0189 in)
Oil ring: 0.20 - 0.50 mm (0.008 - 0.020 in)
Limit:
M/T models
Top ring: 0.54 mm (0.0213 in)
2nd ring: 0.53 mm (0.0209 in)
Oil ring: 0.85 mm (0.0335 in)
A/T models
Top ring: 0.54 mm (0.0213 in)
2nd ring: 0.80 mm (0.0315 in)
Oil ring: 0.95 mm (0.0374 in)
^ If the measured value exceeds the limit, replace piston ring, and measure again. If it still exceeds the limit, re-bore cylinder and use oversize piston and piston rings.