GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Buick 🢒 2007 🢒 Terraza 🢒 Engine 🢒 Engine Cooling 🢒 Exhaust Crossover Pipe Replacement

Removal Procedure

    Object Number: 1679427 Size: SH
  1. Remove the air cleaner outlet duct. Refer to Air Cleaner Outlet Duct Replacement .
  2. Disconnect the heater hoses from the heater pipes.
  3. Remove the nuts holding the heater pipes onto the throttle body.
  4. Position the heater pipes out of the way.
  5. Remove the exhaust crossover heat shield bolts (1).
  6. Remove the exhaust crossover heat shield (2).

    7. Object Number: 1679429 Size: SH
  7. Remove the exhaust crossover pipe nuts (1).
  8. Remove the exhaust crossover pipe (2).
  9. Remove the exhaust crossover pipe seals.

Installation Procedure

    Object Number: 1679429 Size: SH
  1. Install the exhaust crossover pipe seals to the exhaust manifolds.
  2. Install the exhaust crossover pipe (2).

    3. Notice: Refer to Fastener Notice in the Preface section.

  3. Install the exhaust crossover pipe nuts (1).

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


    Object Number: 1679427 Size: SH
  4. Install the exhaust crossover heat shield (2).
  5. Install the exhaust crossover heat shield bolts (1).

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

  6. Position the heater pipes back to the original position.
  7. Install the nuts holding the heater pipes on the throttle body.
  8. Connect the heater hoses onto the heater pipes.
  9. Install the air cleaner outlet duct. Refer to Air Cleaner Outlet Duct Replacement .