3 L4-2.3L (2004)
Piston: Testing and Inspection
PISTON INSPECTION
Caution
* The piston, piston ring and connecting rod cannot be disassembled.
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When replacing the piston, piston pin, piston ring and connecting rod, replace them together 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 inch} above the under of the piston.
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If not within the specification, replace the piston, piston pin, piston ring and connecting rod as a single unit.
Piston diameter 87.465 - 87.495 mm {3.4435 - 3.4446 inch}
2. Measure the piston-to-cylinder clearance.
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If not within the specification, replace the piston, piston pin, piston ring and connecting rod as a single unit.
Standard clearance 0.025 - 0.045 mm {0.0010 - 0.0017 inch}
Maximum clearance 0.11 mm {0.0043 inch}
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, piston pin, piston ring and connecting rod as a single unit.
Standard clearance
Top: 0.03 - 0.08 mm {0.0012 - 0.0031 inch}
Second: 0.03 - 0.07 mm {0.0012 - 0.0027 inch}
Oil: 0.03 - 0.07 mm {0.0012 - 0.0027 inch}
Maximum clearance
Top: 0.17 mm {0.0067 inch}
Second, Oil: 0.15 mm {0.0059 inch}
4. Insert the piston ring into the cylinder by hand and use the piston to push it to the bottom of the ring travel.
5. Measure each piston ring end gap with a feeler gauge.
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If it exceeds the specification, replace the piston, piston pin, piston ring and connecting rod as a single unit.
Standard end gap
Top: 0.16 - 0.31 mm {0.0063 - 0.0122 inch}
Second: 0.33 - 0.48 mm {0.0130 - 0.0189 inch}
Oil (rail): 0.20 - 0.70 mm {0.0079 - 0.0275 inch}
Maximum end gap 1.0 mm {0.0393 inch}
