Note:
• Tighten the exhaust manifold bolts as specified in the service procedure. Improperly installed and/or leaking exhaust manifold gaskets my affect vehicle emissions and/or On Board Diagnostic (OBD) II system performance. • The cylinder head exhaust manifold bolt hole threads must be clean and free of debris or threadlocking material. • DO NOT apply threadlock to the first three thread of the bolts.
Caution: Refer to Fastener Caution in the Preface section.
Tighten
• | Tighten the bolts a first pass to 15 N·m (11 lb ft). Tighten the bolts beginning with the center 2 bolts. Alternate from side to side, and work toward the outside. |
• | Tighten the bolts a final pass to 20 N·m (15 lb ft). Tighten the bolts beginning with the center 2 bolts. Alternate from side to side, and work toward the outside. |
Tighten
Tighten the bolts to 9 N·m (80 lb in).
Tighten
Tighten the nuts to 25 N·m (18 lb ft).
J 39194-B Heated Oxygen Sensor Socket
Note: The HO2S uses a permanently attached pigtail and connector. This pigtail should not be removed from the sensor. Damage or removal of the pigtail or connector will affect proper operation of the sensor.
Caution: Refer to Fastener Caution in the Preface section.
Tighten
Tighten the bolts to 20 N·m (15 lb ft).
Tighten
Tighten the bolts to 20 N·m (15 lb ft).
Tighten
Tighten the bolts to 10 N·m (89 lb in).
Note: Whenever the oxygen sensor is removed, coat the threads with nickel-based anti-seize compound such as GM P/N 5613695 (or equivalent).
Tighten
Tighten the sensor to 42 N·m (31 lb ft).