Exhaust Manifold Replacement - Right Side (RPO L26)

Exhaust Manifold Replacement - Right Side (RPO L26)

Removal Procedure

Caution: Refer to Exhaust Service Caution.

Caution: Refer to Protective Goggles and Gloves Caution.




1. Remove the intake manifold cover.
2. Remove the right side spark plugs.
3. Remove the secondary air injection (AIR) shutoff and check valve, if equipped.
4. Disconnect the engine harness electrical connector from the heated oxygen sensor (HO2S).
5. Remove the HO2S pigtail clip from the sight shield bracket.




6. Remove the HO2S (1) from the exhaust manifold.




7. Remove the power brake booster heat shield nuts.
8. Remove the power brake booster heat shield.




9. Remove the studs attaching the exhaust crossover to the right exhaust manifold.
10. Remove the transaxle fill tube. Refer to Filler Tube and Seal Replacement.
11. Remove the catalytic converter.




12. Remove the sight shield bracket nuts and bracket.




13. Remove the right engine lift bracket bolt and nut.
14. Remove the engine lift bracket.




15. Remove the exhaust manifold heat shield bolts and shield.




16. Remove the exhaust gas recirculation (EGR) vale adapter pipe bolt.




17. Remove the exhaust manifold studs and nuts.
18. Remove the exhaust manifold.
19. Remove and discard the exhaust manifold gasket.
20. Remove and discard the exhaust crossover pipe seal from the either the exhaust crossover or the manifold.

Installation Procedure




1. Install a NEW exhaust crossover pipe seal to the exhaust manifold.
2. Install a NEW exhaust manifold gasket.
3. Install the exhaust manifold.

Notice: Refer to Fastener Notice.

4. Install the exhaust manifold studs and nuts.

^ Tighten the studs to 30 N.m (22 lb ft).
^ Tighten the nuts to 25 N.m (18 lb ft).




5. Install the EGR valve adapter pipe bolt.

Tighten the bolt to 25 N.m (18 lb ft).




6. Position the exhaust manifold heat shield.
7. Install the exhaust manifold heat shield bolts.

Tighten the bolts to 10 N.m (89 lb in).




8. Install the engine lift bracket.
9. Install the right engine lift bracket bolt and nut.

Tighten the bolt/nut to 25 N.m (18 lb ft).




10. Install the sight shield bracket nuts and bracket.

Tighten the nuts to 30 N.m (22 lb ft).




11. Install the catalytic converter.
12. Install the transaxle fill tube. Refer to Filler Tube and Seal Replacement.
13. Install the studs attaching the exhaust crossover to the right exhaust manifold.

Tighten the studs to 18 N.m (13 lb ft).




14. Install the power brake booster heat shield.
15. Install the power brake booster heat shield nuts.

Tighten the nuts to 20 N.m (15 lb ft).





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 an exhaust component and if for any reason the sensor is to be reinstalled, the threads must have anti-seize compound applied before the reinstallation.

16. If reinstalling the old sensor, coat the threads with anti-seize compound GM P/N 12377953, or equivalent.
17. Install the HO2S (1) to the exhaust manifold.

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




18. Connect the engine harness electrical connector to the HO2S.
19. Install the HO2S pigtail clip to the sight shield bracket.
20. Install the AIR shutoff and check valve, if equipped. Refer to Secondary Air Injection Shutoff and Check Valve Replacement.
21. Install the right side spark plugs.
22. Install the intake manifold cover.