OEM Buick Terraza Exhaust Manifold

Buick Terraza Exhaust Manifold Parts and Q&A

• Exhaust Manifold, Driver Side
  12568405
  Q: How to replace the left exhaust manifold on Buick Terraza?

  A:

  The process starts with draining engine coolant before removing the throttle body air inlet duct and continuing by taking off the right engine mount strut bracket. First disconnect the inlet Radiator Hose from the engine before removing the thermostat bypass pipe and after taking out the exhaust crossover pipe bolts from the engine left side Exhaust Manifold. Begin the exhaust replacement process by removing all heat shield bolts from the manifold before taking out the heat shield and finally the Exhaust Manifold nuts along with the Exhaust Manifold itself. Persistent cleaning of the engine left side Exhaust Manifold to engine left side Cylinder Head sealing surface must occur before installing the new Exhaust Manifold Gasket. Install the new Exhaust Manifold Gasket before putting on the Exhaust Manifold then tighten the Exhaust Manifold nuts to 16 nm (12 ft. Lbs.). Fasten the Exhaust Manifold heat shield by tightening bolts to 10 nm (89 inch lbs.). The next step should be to set up the exhaust crossover pipe followed by the thermostat bypass pipe installation and a second reconnection of the inlet Radiator Hose to the engine. As a concluding step install the right engine mount strut bracket while adding engine coolant to the cooling system followed by replanning the throttle body air inlet duct.
• Exhaust Manifold, Passenger Side
  12578348
  Q: How to replace the right exhaust manifold on Buick Terraza?

  A:

  Begin the right Exhaust Manifold replacement by removing the throttle body air inlet duct before rotating the engine for better reach. Remove the manifold air pressure (MAP) sensor followed by the exhaust gas recirculation (EGR) valve. Additionally disconnect the ignition module with the Ignition Coils and bracket. The right bank Spark Plugs receive their plug wire disconnect in the same step as disconnecting the Oxygen Sensor electrical connector. The exhaust crossover pipe nuts/studs on the right bank Exhaust Manifold need removal before raising the vehicle for Catalytic Converter replacement. You must start by removing the Exhaust Manifold heat shield bolts combined with the heat shields before moving on to take out the Exhaust Manifold nuts to finish with replacing the manifold along with its gasket. Thoroughly clean all surface areas where sealing occurs on both the engine right side and the cylinder head. The replacement of the manifold requires removal of both EGR Valve pipe and heated Oxygen Sensor (HO2S). Install the ho2s together with EGR Valve pipe if they were removed previously. Lift the vehicle once more after support then put in the Exhaust Manifold Gasket and Exhaust Manifold before tightening each nut to 16 nm (12 ft. Lbs.). Install the Catalytic Converter after tightening the lower and upper heat shields with bolts at 10 nm (89 inch lbs.). Put down the vehicle to install the crossover exhaust pipe nuts/studs onto the right Exhaust Manifold before attaching the heat shield. Reconnect the ho2s electrical connector and then install Spark Plug Wires and the ignition module with ignition coils together with their bracket. As the last step install the EGR Valve to the intake manifold followed by the MAP Sensor then follow with rotating the engine to its original position before reinstalling the throttle body air inlet duct.