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1.Measure the outer diameter of each piston at right angle 90° to the piston pin, 10.0 mm {0.40 in} above the under of the piston.

• If not within the specification, replace the piston, piston pin and snap ring as a single unit.

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Standard piston outer diameter

88.965—88.995 mm {3.5026—3.5037 in}

2.Measure the piston-to-cylinder clearance.

• If not within the specification, replace the piston, piston pin and snap ring as a single unit.

Standard clearance between piston and cylinder

0.025—0.045 mm {0.0010—0.0017 in}

Maximum clearance between piston and cylinder

0.11 mm {0.0043 in}

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

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

Standard clearance between piston ring and ring groove

Top: 0.04—0.08 mm {0.002—0.003 in}

Second: 0.03—0.07 mm {0.0012—0.0027 in}

Oil: 0.06—0.15 mm {0.003—0.005 in}

Maximum clearance between piston ring and ring groove

Top: 0.17 mm {0.0066 in}

Second, Oil: 0.15 mm {0.0059 in}

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

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5.Measure each piston ring end gap with a feeler gauge.

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

Standard piston ring end gap

Top: 0.16—0.26 mm {0.0063—0.010 in}

Second: 0.31—0.46 mm {0.013—0.018 in}

Oil (rail): 0.15—0.40 mm {0.006—0.015 in}

Maximum piston ring end gap

1.0 mm {0.039 in}