OEM Cadillac XLR Exhaust Manifold

Cadillac XLR Exhaust Manifold Parts and Q&A

• Exhaust Manifold, Passenger Side
  12638990
  Q: How to replace the right exhaust manifold on Cadillac XLR?

  A:

  The powertrain needs removal before performing a right Exhaust Manifold replacement task. Begin by removing the bolt attaching the catalytic converter pipe to the bell housing followed by removing the connector position assurance for the Oxygen Sensor and disconnecting both Oxygen Sensor electrical connectors (1, 2). One must practice safety precautions for working with oxygen sensors. You should start by separating the oxygen sensors before pulling off the right Exhaust Manifold heat shield bolts and its accompanying heat shield. After you remove the bolts and nuts from the Exhaust Manifold proceed to take off both the manifold and worn gasket which you must dispose. Use gm p/n 12345493 (Canadian P/N 10953488) threadlock equivalent to apply a 0.2 inch wide band at the Exhaust Manifold bolt and stud threads for installation purposes. Lay the Exhaust Manifold on its designated position with a new gasket while making sure the threads of cylinder head Exhaust Manifold bolt holes remain unobstructed. The Exhaust Manifold bolts require installation followed by nut tightening at 25 nm (18 lb ft) with a starting point at the center pair of bolts while using an alternating side-to-side approach. Securely bolt down the Exhaust Manifold together with the catalytic converter to the bell housing keeping the exhaust hanger bolt at a torque setting of 50 nm (37 lb ft). Secure the right Exhaust Manifold heat shield together with its bolts while torquing them to 10 nm (89 lb in). The Oxygen Sensor threads should receive an application of gm p/n 12377953 anti-siize compound or its equivalent material before installing the sensors with a torque setting of 42 nm (30 lb ft). The Oxygen Sensor electrical connectors need to be connected first before installing the cpa locks . Finally, reinstall the powertrain.
• Exhaust Manifold, Driver Side
  12638991
  Q: How to replace the left exhaust manifold on Cadillac XLR?

  A:

  The replacement of the left Exhaust Manifold starts with powertrain removal followed by removal of Exhaust Manifold and Catalytic Converter assembly bolts that attach the pipe to the bell housing. Begin by unlocking the connector position assurance lock of the Oxygen Sensors before you disconnect the Oxygen Sensor electrical connectors (1, 2). First remove the oxygen sensors before taking out the bolts securing the left Exhaust Manifold heat shield and its accompanying shield. Use a socket to remove bolts and nuts from the Exhaust Manifold and continue by taking out both the Exhaust Manifold along with its gasket to discard it. Before putting in place the Exhaust Manifold ensure all bolt hole threads in the cylinder head are unobstructed from dirt and threadlocking substances. Install a 0.2 inch wide strip of threadlocking material gm p/n 12345493 (Canadian P/N 10953489) equivalent on the Exhaust Manifold bolts and studs threads. After that, position the Exhaust Manifold with a new gasket into its place. First tighten the center two bolts of the Exhaust Manifold to 25 n.m (18 lb ft), followed by working side-to-side when torquing the progressive nut pattern. In this step fasten the Exhaust Manifold Catalytic Converter hanger bolt at the bell housing until it reaches 50 n.m (37 lb ft). Attach the left Exhaust Manifold heat shield with its bolts while tightening heat shield bolts to 10 n.m (89 lb in). Apply anti-seize compound gm p/n 12377953 or equivalent to the Oxygen Sensor threads before installing each sensor and torquing them to 42 n.m (30 lb ft). Complete the connection of Oxygen Sensor electrical connectors after fixing the cpa locks then reinstall the powertrain.