engine

Turbocharger Torque Specs

for 2012 Mercedes-Benz ML550 W166 4.6L V8 BiTurbo M278 · AWD

Units

18 fasteners

Seq

Component

Torque

Angle

—

Coolant Line Fittings

11 lb-ft · 15 Nm

—

Cover Bolts

15 lb-ft · 20 Nm

—

Electrical Connector Bolts

6 lb-ft · 8 Nm

—

Exhaust Manifold Nuts

Critical

Apply anti-seize, work hot-to-cold

22 lb-ft · 30 Nm

—

Gasket Bolts

Critical

19 lb-ft · 25 Nm

—

Gasket Surface Bolts

Critical

Clean mating surfaces

19 lb-ft · 26 Nm

—

Heat Shield Bolts

7 lb-ft · 10 Nm

—

Mounting Bolts

Critical

44 lb-ft · 60 Nm

—

Oil Feed Line

Critical

Use new crush washers

15 lb-ft · 20 Nm

—

Oil Return Line

7 lb-ft · 10 Nm

—

Sensor Bolts

10 lb-ft · 14 Nm

—

Sensor Mounting Bolts

10 lb-ft · 14 Nm

—

Turbo Oil Drain Line

Ensure no restrictions.

9 lb-ft · 12 Nm

—

Turbo Oil Feed Line

Critical

Use new crush washers. Prime turbo with oil before start.

15 lb-ft · 20 Nm

—

Turbo-to-Downpipe Bolts

Critical

33 lb-ft · 45 Nm

—

Turbo to Exhaust Manifold Nuts

Critical

Use new gaskets. Both turbos same spec.

12 lb-ft · 16 Nm

—

Turbo-to-Manifold Bolts

Critical

Apply anti-seize

26 lb-ft · 35 Nm

—

Wastegate Actuator

Critical

Calibrate after installation.

18 lb-ft · 24 Nm

—

2012 MERCEDES-BENZ ML550 W166

18 fasteners