engine

Main Bearings Torque Specs

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

Units

15 fasteners

Seq

Component

Torque

Angle

—

Cover Bolts

15 lb-ft · 20 Nm

—

Electrical Connector Bolts

6 lb-ft · 8 Nm

—

Flywheel Bolts

Critical

Often TTY, tighten in star pattern | ⚠️ VERIFY SEQUENCE WITH SERVICE MANUAL

70 lb-ft · 95 Nm

—

Gasket Bolts

Critical

19 lb-ft · 25 Nm

—

Gasket Surface Bolts

Critical

Clean mating surfaces

19 lb-ft · 26 Nm

—

Main Bearing Cap Bolts

Critical

TTY - tighten in sequence plus angle | ⚠️ VERIFY SEQUENCE WITH SERVICE MANUAL

55 lb-ft · 75 Nm

—

Main Bearing Cap Bolts (Inner)

Critical

REPLACE BOLTS. Step 1: 30 lb-ft. Step 2: +90°.

30 lb-ft · 40 Nm

90°

—

Main Bearing Cap Bolts (Outer)

Critical

Tighten after inner bolts.

11 lb-ft · 15 Nm

—

Mounting Bolts

Critical

44 lb-ft · 60 Nm

—

Oil Drain Plug

Critical

Use new crush washer | ⚠️ VERIFY SEQUENCE WITH SERVICE MANUAL

26 lb-ft · 35 Nm

—

Oil Pan Bolts

Critical

Tighten in sequence | ⚠️ VERIFY SEQUENCE WITH SERVICE MANUAL

9 lb-ft · 12 Nm

—

Oil Pump Pickup Tube

Critical

⚠️ VERIFY SEQUENCE WITH SERVICE MANUAL

9 lb-ft · 12 Nm

—

Sensor Bolts

10 lb-ft · 14 Nm

—

Sensor Mounting Bolts

10 lb-ft · 14 Nm

—

Transmission-to-Engine Bolts

Critical

⚠️ VERIFY SEQUENCE WITH SERVICE MANUAL

41 lb-ft · 55 Nm

—

2012 MERCEDES-BENZ ML550 W166

15 fasteners