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 MANUALSCHEVROLET2012SONIC L4-1.8LREPAIR AND DIAGNOSISENGINE, COOLING AND EXHAUSTENGINECYLINDER HEAD ASSEMBLYSPECIFICATIONS
2012 Chevrolet Sonic L4-1.8L
Cylinder Head Assembly: Specifications
2012 Chevrolet Sonic L4-1.8LSECTION Specifications
NOTE:
USE NEW cylinder head bolts
First Pass 25 Nm (18 lb ft)
Second Pass 90°
Third Pass 90°
Fourth Pass 90°
Fifth Pass 45°
Cylinder Head Surface Flatness - Block Deck Longitude 0.05 mm (0.00197 in)
Cylinder Head Surface Flatness - Block Deck Transverse 0.03 mm (0.00118 in)
Camshaft Bearing Caps in sequence (2, 3, 1, 4) 8 Nm (71 lb in)
Intake Manifold Bolt 20 Nm (15 lb ft)
Exhaust Manifold 20 Nm (15 lb ft)
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.