Chevrolet Silverado / GMC Sierra. Manual — part 1822

Fig. 116: View Of Catalytic Converter Assembly HO2S's
Courtesy of GENERAL MOTORS CORP.

26. Remove the HO2S (1-5) from the catalytic converter assembly. (1500 series shown,

2500/3500 series similar).

Installation Procedure

IMPORTANT: A special anti-seize compound is used on the HO2S threads. The

compound consists of liquid graphite and glass beads. The
graphite tends to burn away, but the glass beads remain, making
the sensor easier to remove. New, or service replacement
sensors already have the compound applied to the threads. If the
sensor is removed from as exhaust component and if for any

2008 Chevrolet Silverado 1500

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

Fig. 117: View Of Catalytic Converter Assembly HO2S's
Courtesy of GENERAL MOTORS CORP.

1. If replacing the catalytic converter assembly, perform the following steps, otherwise

proceed to step 4.

2. If reinstalling the old sensors, coat the threads with anti-seize compound GM P/N

12377953, or equivalent.

reason the sensor is to be reinstalled, the threads must have anti-
seize compound applied before the reinstallation.

NOTE:

Refer to Component Fastener Tightening Notice .

2008 Chevrolet Silverado 1500

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

3. Install the HO2S (1-5) to the catalytic converter assembly. (1500 series shown, 2500/3500

series similar).

Tighten: Tighten the sensors to 42 N.m (31 lb ft).

Fig. 118: View Of Catalytic Converter To Exhaust Manifold Nuts & Exhaust Seals
Courtesy of GENERAL MOTORS CORP.

4. Install the NEW exhaust seals (2 and 3) as required. (1500 series shown, 2500/3500 series

similar).

5. Install the catalytic converter assembly to the muffler.

6. Install the catalytic converter assembly to the exhaust manifolds.

NOTE:

Refer to Fastener Notice .

2008 Chevrolet Silverado 1500

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