GM Service Manual Online
For 1990-2009 cars only

Exhaust Manifold Replacement - Left Side RPO LX9

Removal Procedure


    Object Number: 1641116  Size: SH
  1. Remove the right engine mount strut bracket. Refer to Engine Mount Strut Bracket Replacement - Right Side .
  2. Remove the thermostat bypass pipe. Refer to Thermostat Bypass Pipes Replacement .
  3. Reposition the radiator inlet hose clamp at the thermostat housing.
  4. Remove the radiator inlet hose from the thermostat housing.

  5. Object Number: 1645118  Size: SH
  6. Remove the exhaust crossover pipe heat shield bolts.
  7. Remove the exhaust crossover pipe heat shield.

  8. Object Number: 1645119  Size: SH
  9. Remove the exhaust crossover pipe nuts from the left exhaust manifold studs.

  10. Object Number: 1645120  Size: SH
  11. Remove the exhaust manifold heat shield bolts.
  12. Remove the exhaust manifold heat shield.

  13. Object Number: 1645121  Size: SH
  14. Remove the exhaust manifold nuts.
  15. Remove the exhaust manifold.
  16. Remove and discard the exhaust manifold gasket.
  17. Clean the exhaust manifold sealing surfaces.

Installation Procedure


    Object Number: 1645121  Size: SH
  1. Install a NEW exhaust manifold gasket onto the studs
  2. Install the exhaust manifold.
  3. Notice: Refer to Fastener Notice in the Preface section.

  4. Install the exhaust manifold nuts.
  5. Tighten
    Tighten the nuts to 16 N·m (12 lb ft).


    Object Number: 1645120  Size: SH
  6. Position the exhaust manifold heat shield to the exhaust manifold.
  7. Install the exhaust manifold heat shield bolts.
  8. Tighten
    Tighten the bolts to 10 N·m (89 lb in).


    Object Number: 1645119  Size: SH
  9. Install the exhaust crossover pipe nuts to the left exhaust manifold studs.
  10. Tighten
    Tighten the nuts to 25 N·m (18 lb ft).


    Object Number: 1645118  Size: SH
  11. Position the exhaust crossover pipe heat shield to the crossover pipe.
  12. Install the exhaust crossover pipe heat shield bolts.
  13. Tighten
    Tighten the bolts to 10 N·m (89 lb in).


    Object Number: 1641116  Size: SH
  14. Install the radiator inlet hose to the thermostat housing.
  15. Position the radiator inlet hose clamp at the thermostat housing.
  16. Install the thermostat bypass pipe. Refer to Thermostat Bypass Pipes Replacement .
  17. Install the right engine mount strut bracket. Refer to Engine Mount Strut Bracket Replacement - Right Side .