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.
2009 Jeep Commander 4WD V8-4.7LFACTORY OEM SERVICE PROCEDURE
Piston, Engine
Piston Dimensions And Clearances
Diameter 92.975 mm (3.6605 in.)
Weight 366 grams (12.9 oz.)
No.1 Ring Groove Diameter 83.37 - 83.13 mm (3.282 - 3.273 in.)
No.2 Ring Groove Diameter 82.8333 - 83.033 mm (3.261 - 3.310 in.)
No.3 Ring Groove Diameter 83.88 - 84.08 mm (3.302 - 3.310 in.)
Piston Pin
Clearance in Piston 0.010 - 0.019 mm (0.0004 - 0.0008 in.)
Diameter 92.975 mm (3.6605 in.)
Weight 366 grams (12.9 oz.)
No.1 Ring Groove Diameter 83.37 - 83.13 mm (3.282 - 3.273 in.)
No.2 Ring Groove Diameter 82.8333 - 83.033 mm (3.261 - 3.310 in.)
No.3 Ring Groove Diameter 83.88 - 84.08 mm (3.302 - 3.310 in.)
Piston Pin
Clearance in Piston 0.010 - 0.019 mm (0.0004 - 0.0008 in.)
Factory Service Tools
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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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.
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