PISTON RING CLEARANCE INSPECTION [MZR-CD 2.2]

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Caution

• If the piston are disassembled, the piston, piston pin, and snap ring must be replaced as a single unit.

1. Measure the piston ring-to-ring groove clearance around the entire circumference.

• If it exceeds the maximum specification, replace the piston and piston ring.

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Standard clearance between piston ring and ring groove

Top : 0.17—0.21 mm {0.0067—0.0082 in}

Second :0.04—0.08 mm {0.002—0.003 in}

Oil : 0.03—0.07 mm {0.0012—0.0027 in}

Maximum clearance between piston ring and ring groove

0.15 mm {0.0059 in}

2. Insert the piston ring into the cylinder by hand and use the piston to push it to the bottom of the ring travel.

3. Measure each piston ring end gap using a feeler gauge.

• If it exceeds the maximum specification, replace the piston ring.

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Standard piston ring end gap

Top : 0.25—0.35 mm {0.010—0.013 in}

Second : 0.20—0.30 mm {0.008—0.011 in}

Oil rail : 0.20—0.30 mm {0.008—0.011 in}

Maximum piston ring end gap

1.0 mm {0.039 in}