Chevrolet Silverado / GMC Sierra. Service manual — part 1816

Fig. 91: Identifying Appropriate Exhaust Seals & Gaskets
Courtesy of GENERAL MOTORS CORP.

1. Install the NEW appropriate exhaust seal (1) or gasket (2).

2. Install the exhaust manifold pipe, if required. Refer to Exhaust Manifold Pipe

Replacement (6.0L - Cab/Chassis).

3. Install the left catalytic converter, if required. Refer to Catalytic Converter Replacement

- Left Side (6.0L - Cab/Chassis).

CATALYTIC CONVERTER REPLACEMENT (4.3L)

Removal Procedure

2008 Chevrolet Silverado 1500

2008 ENGINE Engine Exhaust - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado

Fig. 92: View Of Oil Pan Skid Plate & Bolts
Courtesy of GENERAL MOTORS CORP.

1. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle .

2. Remove the oil pan skid plate bolts and skid plate, if equipped.

3. Remove the transmission crossmember. Refer to Transmission Support Crossmember

Replacement (2WD 2500 HD/3500) or Transmission Support Crossmember
Replacement (2WD 1500/2500) or Transmission Support Crossmember Replacement
(4WD 1500/2500) or Transmission Support Crossmember Replacement (4WD 2500
HD/3500) .

2008 Chevrolet Silverado 1500

2008 ENGINE Engine Exhaust - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado

Fig. 93: View Of Engine Harness Clip & Electrical Connectors
Courtesy of GENERAL MOTORS CORP.

4. Remove the right front connector position assurance (CPA) retainer.

5. Disconnect the right front heated oxygen sensor (HO2S) electrical connector (5) from the

engine wiring harness electrical connector (4).

6. Remove the right rear CPA retainer.

7. Disconnect the engine wiring harness electrical connector (2) from the right rear HO2S

electrical connector (1).

8. Remove the right rear HO2S electrical connector clip from the engine harness clip (3).

2008 Chevrolet Silverado 1500

2008 ENGINE Engine Exhaust - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado

Fig. 94: View Of Engine Wiring Harness Electrical Connector & HO2S Electrical
Connector
Courtesy of GENERAL MOTORS CORP.

9. Remove the left rear CPA retainer.

10. Disconnect the engine wiring harness electrical connector (1) from the left rear HO2S

electrical connector (2).

11. Remove the left rear HO2S electrical connector clip from the frame.

2008 Chevrolet Silverado 1500

2008 ENGINE Engine Exhaust - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado