engine

Head Gaskets - Both Torque Specs

for 2012 GMC Sierra 2500HD 6.6L V8 Duramax Diesel · 4WD

Units

12 fasteners

Seq

Component

Torque

Angle

—

Camshaft Cap Bolts

Critical

Torque sequence

12 lb-ft · 16 Nm

—

Cover Bolts

16 lb-ft · 22 Nm

—

Cylinder Head Bolts

Critical

Multi-step + angle

65 lb-ft · 88 Nm

—

Cylinder Head Bolts (M12)

Critical

1) 37 lb-ft. 2) 59 lb-ft. 3) +60 degrees. 4) +60 degrees.

37 lb-ft · 50 Nm

120°

—

Cylinder Head Bolts (M8)

Critical

Tighten small bolts to 18 lb-ft last.

18 lb-ft · 25 Nm

—

Electrical Connector Bolts

7 lb-ft · 9 Nm

—

Exhaust Manifold Nuts

Critical

25 lb-ft · 34 Nm

—

Gasket Surface Bolts

Critical

Clean mating surfaces

20 lb-ft · 27 Nm

—

Intake Manifold Bolts

Critical

18 lb-ft · 24 Nm

—

Mounting Bolts

Critical

47 lb-ft · 64 Nm

—

Sensor Mounting Bolts

11 lb-ft · 15 Nm

—

Valve Cover Bolts

Critical

10 lb-ft · 14 Nm

—

2012 GMC SIERRA 2500HD

12 fasteners