engine

Exhaust Manifold Torque Specs

for 1990 Mercedes-Benz 420SEL 4.2L V8 M116 · RWD

Units

8 fasteners

Seq

Component

Torque

Angle

—

Cover Bolts

12 lb-ft · 16 Nm

—

Exhaust Flange Bolts

Critical

Apply anti-seize | ⚠️ VERIFY SEQUENCE WITH SERVICE MANUAL

35 lb-ft · 47 Nm

—

Exhaust Manifold Nuts

Critical

Apply anti-seize, work hot-to-cold | ⚠️ VERIFY SEQUENCE WITH SERVICE MANUAL

22 lb-ft · 30 Nm

—

Flange Bolts

Critical

Anti-seize

35 lb-ft · 47 Nm

—

Hanger Bolts

15 lb-ft · 20 Nm

—

Heat Shield Bolts

Critical

⚠️ VERIFY SEQUENCE WITH SERVICE MANUAL

7 lb-ft · 10 Nm

—

Mounting Bolts

Critical

35 lb-ft · 47 Nm

—

O2 Sensor

Critical

Anti-seize threads

35 lb-ft · 47 Nm

—