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Caution

• The piston, piston pin and connecting rod (semi-floating type piston pin) cannot be disassembled.

• When replacing the piston, piston pin, and connecting rod (semi-floating type piston pin), replace them together as a single unit.

• If the piston, piston pin, and connecting rod of the full floating type piston pin are disassembled, the piston, piston pin, and snap ring must be replaced as a single unit.

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.

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Semi-floating type piston pin

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

Full floating type piston pin

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

Piston diameter (Standard)

87.465—87.495 mm {3.4435—3.4446 in}

2.Measure the piston-to-cylinder clearance.

Semi-floating type piston pin

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

Full floating type piston pin

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

Piston-to-cylinder clearance (Standard)

0.025—0.045 mm {0.0010—0.0017 in}

Piston-to-cylinder clearance (Maximum)

0.11 mm {0.0043 in}

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

• If it exceeds the specification, replace the piston, piston pin, piston ring and connecting rod as a single unit.

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Piston ring-to-ring groove clearance (Standard)

Top: 0.03—0.08 mm {0.0012—0.0031 in}

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

Oil: 0.03—0.07 mm {0.0012—0.0027 in}

Piston ring-to-ring groove clearance (Maximum)

Top: 0.17 mm {0.0067 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, piston pin, piston ring and connecting rod as a single unit.

Piston ring end gap (Standard)

Top: 0.16—0.31 mm {0.0063—0.0122 in}

Second: 0.33—0.48 mm {0.0130—0.0189 in}

Oil (rail): 0.20—0.70 mm {0.0079—0.0275 in}

Piston ring end gap (Maximum)

1.0 mm {0.0393 in}