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 MANUALSCHEVROLET2009IMPALA V6-3.9LREPAIR AND DIAGNOSISSPECIFICATIONSMECHANICAL SPECIFICATIONSENGINECYLINDER BLOCK ASSEMBLYCRANKSHAFT MAIN BEARING
2009 Chevrolet Impala V6-3.9L
Crankshaft Main Bearing
2009 Chevrolet Impala V6-3.9LSECTION Crankshaft Main Bearing
CRANKSHAFT MAIN BEARING
Crankshaft Main Bearing Clearance - Except # 3 0.019-0.064 mm (0.0008-0.0025 in)
Crankshaft Main Bearing Clearance - #3 Thrust Bearing 0.032-0.077 mm (0.0012-0.0030 in)
Crankshaft Main Bearing Bore diameter 72.1535-72.0695 mm (2.840-2.841 in)
Crankshaft Main Bearing Bore Out-of-Round 0.008 mm (0.00031 in)
MAIN BEARING CAP
Bearing Cap Bolts
First Pass 50 Nm (37 lb ft)
Final Pass 77 degrees
Crankshaft Main Bearing Clearance - Except # 3 0.019-0.064 mm (0.0008-0.0025 in)
Crankshaft Main Bearing Clearance - #3 Thrust Bearing 0.032-0.077 mm (0.0012-0.0030 in)
Crankshaft Main Bearing Bore diameter 72.1535-72.0695 mm (2.840-2.841 in)
Crankshaft Main Bearing Bore Out-of-Round 0.008 mm (0.00031 in)
MAIN BEARING CAP
Bearing Cap Bolts
First Pass 50 Nm (37 lb ft)
Final Pass 77 degrees
RENDER: 1.0x
NO RELATED
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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.