Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSMAZDA20086 S SPORT, 4D HATCHBACK, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 16 (ENGINE MECHANICAL)OVERHAULCYLINDER BLOCK ASSEMBLYPISTON & ROD ASSEMBLY
2008 Mazda 6 s Sport, 4D Hatchback, Standard
Piston & Rod Assembly
2008 Mazda 6 s Sport, 4D Hatchback, StandardSECTION Piston & Rod Assembly
WARNING: This page is about a different car, the 2001 Mazda MPV and 2000 Mazda MPV. However, it is still accessible from the selected car via links, so may be relevant.
- Ensure piston, connecting rod and connecting rod cap are match-marked for reassembly reference. Hold piston/rod assembly with connecting rod positioned horizontally. Pull connecting rod upward. Release connecting rod and ensure connecting rod drops freely. Replace piston or piston pin if connecting rod fails to drop freely.
- To remove piston from connecting rod, properly support piston in hydraulic press. Press piston pin from connecting rod. Measure each piston pin bore diameter on "X" and "Y" axis at four points along piston pin bore. Measure each connecting rod small end inner diameter. Measure each piston pin diameter on "X" and "Y" axis at four points along piston pin diameter.
- Calculate piston pin-to-piston pin bore clearance. Standard clearance is .00008-.00035" (.002-.009 mm). Replace piston or piston pin if clearance is not as specified. Calculate connecting rod-to-piston pin clearance. Standard clearance is .00016-.00078" (.004-.020 mm). Replace connecting rod or piston pin if clearance exceeds .0013" (.035 mm).
- Ensure piston pin bore diameter, piston pin diameter and connecting rod small end diameter are within specification. See PISTONS, PINS & RINGS under ENGINE SPECIFICATIONS. To assemble piston on connecting rod, ensure front mark on piston ("L" or "R") and connecting rod are facing upward. Ensure piston is properly supported in hydraulic press. Press in piston pin. Ensure connecting rod pivots freely.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.