Exhaust Manifold Installation - Left (W/O RPO NC1 or NF7)

WARNING: This page is about a different car, the 2002 Oldsmobile Aurora and 2001 Oldsmobile Aurora. However, it is still accessible from the selected car via links, so may be relevant.

CAUTION: Refer to FASTENER NOTICE in Cautions and Notices.

If the engine is equipped with coolant heaters, install the left side (1) heater as follows:
1. 1.1. Place the coolant heater (1) in position on the cylinder block.
2. 1.2. Install the coolant heater bolt.
  Tighten
  
  Tighten the coolant heater bolt to 10 N.m (89 in lbs).
Fig 1: Installing Left Side Coolant Heater
Courtesy of GENERAL MOTORS CORP.
With the manifold still on the bench, position a new manifold gasket (1) in place on the manifold sealing surface.
Install 2 outer manifold bolts (6) in the manifold to retain the gasket.
Install a new manifold to intermediate pipe flange gasket (5).
Using 2 hands, place the manifold (2) in the intermediate pipe and onto the cylinder head.
Install new manifold flange bolts (3) for maximum joint integrity. Hand tighten. Do not torque the flange bolts to specification until the engine is mounted in the vehicle.
Hand tighten the 2 outer manifold bolts.
Install the remaining manifold bolts.
Tighten

Tighten the exhaust manifold bolts (6) to 25 N.m (18 ft lbs).

Fig 2: Installing Manifold & Gasket
Courtesy of GENERAL MOTORS CORP.
Coat the oxygen sensor threads with high temperature anti-seize, GM P/N 12377953 or equivalent.
Install the oxygen sensor (1).
Tighten

Tighten the oxygen sensor to 40 N.m (30 ft lbs).

Fig 3: Installing Oxygen Sensor
Courtesy of GENERAL MOTORS CORP.