engine

Cylinder Head R&R Torque Specs

for 2015 GMC Sierra 3500HD 6.6L V8 Duramax Diesel · 4WD

Units

9 fasteners

Seq

Component

Torque

Angle

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Cover Bolts

16 lb-ft · 22 Nm

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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°

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Cylinder Head Bolts (M8)

Critical

Tighten small bolts to 18 lb-ft last.

18 lb-ft · 25 Nm

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Electrical Connector Bolts

7 lb-ft · 9 Nm

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Gasket Bolts

Critical

15 lb-ft · 20 Nm

—

Gasket Surface Bolts

Critical

Clean mating surfaces

20 lb-ft · 27 Nm

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Mounting Bolts

Critical

47 lb-ft · 64 Nm

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Sensor Bolts

8 lb-ft · 11 Nm

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Sensor Mounting Bolts

11 lb-ft · 15 Nm

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