Installation Procedure

NOTE: Refer to Fastener Notice .

Install the lower heat insulator.
Install the lower heat insulator bolts.
Tighten: Tighten the lower heat insulator bolts to 12 N.m (9 lb ft).
Install the following components:
- The exhaust manifold gasket
- The exhaust manifold
Install the 2 exhaust manifold nuts (1) and 3 exhaust manifold bolts (2).
Tighten: Tighten the exhaust manifold nuts and bolts to 37 N.m (27 lb ft).
Install the upper heat insulator.

Fig 1: Exhaust Manifold Nuts And Bolts

Courtesy of GENERAL MOTORS CORP.

Install the upper heat insulator bolts.
Tighten: Tighten the upper heat insulator bolts to 18 N.m (13 lb ft).

Fig 2: Exhaust Support Bracket Bolt

Courtesy of GENERAL MOTORS CORP.

Install one bolt (1) to the manifold support bracket to exhaust manifold.
Tighten: Tighten the exhaust manifold support bracket bolt to 49 N.m (37 lb ft).
Install the exhaust manifold flange gasket.
Install the following components to the exhaust manifold flange:
- The springs
- Two bolts
  Tighten: Tighten the exhaust manifold flange bolts to 43 N.m (32 lb ft).
Install the exhaust pipe hanger (2).

Fig 3: Heated Oxygen Sensor (HO2S1), Exhaust Pipe Hanger, Springs And Bolts

Courtesy of GENERAL MOTORS CORP.

CAUTION: Refer to BATTERY DISCONNECT CAUTION .