Cadillac 12616286 Engine Exhaust Manifold

Disconnect the cable from the negative terminal of the battery. Raise the vehicle and support it securely on jackstands. Working under the vehicle, apply penetrating oil to the exhaust pipe-to-manifold studs and nuts, which are usually rusty. Remove the nuts retaining the exhaust pipe(s) to the manifold(s). Disconnect the spark plug wires, remove them from their retainers and lay them out of the way. Remove the exhaust manifold fasteners. Remove the manifolds along with the heat shields and discard the gaskets. The heat shields can be removed at this time. Check the manifold for cracks and ensure the bolt threads are clean and undamaged. The manifold and cylinder head mating surfaces must be clean before the manifolds are reinstalled-use a gasket scraper to remove all carbon deposits. Position the manifold on a bench and install the heat shields, bolts, and gaskets onto the manifold. Retaining tabs surrounding the gasket bolt holes will hold the assembly together as the manifold is installed. Place the manifold on the cylinder head and install the mounting bolts finger-tight. When tightening the mounting bolts, work from the center to the ends, and use a torque wrench. Tighten the bolts in two steps to the torque specifications. If equipped, bend the locking tabs back against the bolt heads. The remainder of installation is the reverse of removal. Start the engine and check for exhaust leaks.

To remove the exhaust manifold, first disconnect the cable from the negative terminal of the battery and remove the engine cover. Raise the vehicle and support it securely on jackstands. Apply penetrating oil to the exhaust pipe-to-manifold studs and nuts, then remove the nuts retaining the exhaust pipe(s) to the manifold, accessing them from underneath the vehicle; on some models, it may be easier to remove the wheel and fender splash shield. For the right side manifold, remove the air filter housing, then the Secondary AIR bypass hoses and valves if equipped. Detach the spark plug wires and remove the plug wire retaining bracket, positioning the wires out of the way. Remove the oil dipstick and unbolt the dipstick tube bracket. On 2014 and earlier models, removing the inner splash shield from the fenderwell can provide easier access to the exhaust manifold. Bend the lock tabs back if equipped, then remove the mounting bolts and separate the exhaust manifold from the cylinder head, followed by removing the heat shields. For the left side manifold, remove the Secondary AIR injection pipe and the EGR pipe if equipped, then repeat the process of detaching the spark plug wires and removing the plug wire retaining bracket. Disconnect the electrical connector from the Engine Coolant Temperature sensor, bend the lock tabs back if equipped, and remove the mounting bolts to separate the exhaust manifold from the cylinder head, also removing the heat shields. For installation, check the manifold for cracks and ensure the bolt threads are clean and undamaged, making sure the mating surfaces are clean before reinstalling. Position the manifold on a bench to install the heat shields, bolts, and gaskets, then place the manifold on the cylinder head and install the mounting bolts finger tight. When tightening the mounting bolts, work from the center to the ends using a torque wrench, tightening in two steps. If equipped, bend the locking tabs back against the bolt heads. The remaining installation steps follow the reverse order of removal, and finally, start the engine to check for exhaust leaks.

To remove the exhaust manifold, first disconnect the cable from the negative terminal of the battery, then remove the engine cover. Raise the vehicle and support it securely on jackstands. Apply penetrating oil to the exhaust pipe-to-manifold studs and nuts, and disconnect the electrical connector for the oxygen sensor. Remove the nuts retaining the exhaust pipe(s) to the manifold(s). Detach the spark plug wires and remove the spark plugs from the side being worked on; if both manifolds are being removed, detach all spark plug wires and remove all spark plugs. For the right side manifold, remove the inner splash shield from the fenderwell, noting that access is easier with the front wheel and inner fenderwell removed, though not absolutely necessary. Remove the oil dipstick, unbolt the dipstick tube bracket, and move the dipstick tube. Remove the EGR valve and pipe assembly, then remove the mounting bolts and separate the exhaust manifold from the cylinder head, followed by removing the heat shields from the manifold. For the left side manifold, remove the EGR pipe from the exhaust manifold and the inner splash shield from the fenderwell, again noting that access is easier with the front tire and inner fenderwell removed. Remove the mounting bolts and separate the exhaust manifold from the cylinder head, followed by removing the heat shields. For installation, check the manifold for cracks and ensure the bolt threads are clean and undamaged, making sure the mating surfaces are clean before reinstalling the manifolds. Install the heat shields, bolts, and gaskets onto the manifold, ensuring the retaining tabs hold the assembly together during installation. Place the manifold on the cylinder head and install the mounting bolts finger tight, then tighten the bolts from the center to the ends using a torque wrench, completing the process in two steps. If necessary, bend the exposed end of the exhaust manifold gasket back against the cylinder head. The remaining installation steps are the reverse of removal, and always use new O-rings and gaskets on the EGR valve and pipe assembly. Finally, start the engine and check for exhaust leaks.

Disconnect the cable from the negative terminal of the battery. Raise the vehicle and support it securely on jackstands. Working under the vehicle, apply penetrating oil to the exhaust pipe-to-manifold studs and nuts (they're usually rusty). Remove the inner fender splash shield. Disconnect the exhaust pipe/catalytic converter pipe from the exhaust manifold. Remove the spark plug wires. Use a dab of paint to mark the alignment of the upper section of the steering intermediate shaft to the lower part of the steering column. Remove the fasteners, then separate the shafts so they can be moved aside. Remove the oil dipstick tube. If a new manifold is to be installed, remove the heat shield. Remove the manifold mounting bolts, then lift off the exhaust manifold and its gasket. Check the manifold for cracks and make sure the bolt threads are clean and undamaged. The manifold and cylinder head mating surfaces must be clean before the manifolds are reinstalled-use a gasket scraper to remove all carbon deposits and gasket material. Install the heat shields, then install the bolts and gaskets onto the manifold. Retaining tabs surrounding the gasket bolt holes should hold the assembly together as the manifold is installed. Starting at the fourth thread, apply a 1/4-inch wide band of medium-strength thread-locking compound to the threads of the bolts. Place the manifold on the cylinder head and install the mounting bolts finger-tight. When tightening the mounting bolts, work from the center to the ends. Tighten the bolts in two steps to the proper torque specifications. If required, bend the exposed end of the exhaust manifold gasket back against the cylinder head. The remainder of installation is the reverse of removal. Start the engine and check for exhaust leaks.

Disconnect the cable from the negative terminal of the battery. Raise the vehicle and support it securely on jackstands. Working under the vehicle, apply penetrating oil to the exhaust pipe-to-manifold studs and nuts, which are usually rusty. Remove the nuts retaining the exhaust pipe(s) to the manifold(s). Disconnect the spark plug wires, remove them from their retainers and lay them out of the way. Remove the exhaust manifold fasteners. Remove the manifolds along with the heat shields and discard the gaskets. The heat shields can be removed at this time. Check the manifold for cracks and ensure the bolt threads are clean and undamaged. The manifold and cylinder head mating surfaces must be clean before the manifolds are reinstalled-use a gasket scraper to remove all carbon deposits. Position the manifold on a bench and install the heat shields, bolts, and gaskets onto the manifold. Retaining tabs surrounding the gasket bolt holes will hold the assembly together as the manifold is installed. Place the manifold on the cylinder head and install the mounting bolts finger-tight. When tightening the mounting bolts, work from the center to the ends, and use a torque wrench. Tighten the bolts in two steps to the torque specifications. If equipped, bend the locking tabs back against the bolt heads. The remainder of installation is the reverse of removal. Start the engine and check for exhaust leaks.

Disconnect the cable from the negative terminal of the battery. Raise the vehicle and support it securely on jackstands. Working under the vehicle, apply penetrating oil to the exhaust pipe-to-manifold studs and nuts (they're usually rusty). Remove the inner fender splash shield. Disconnect the exhaust pipe/catalytic converter pipe from the exhaust manifold. Remove the spark plug wires. Use a dab of paint to mark the alignment of the upper section of the steering intermediate shaft to the lower part of the steering column. Remove the fasteners, then separate the shafts so they can be moved aside. Remove the oil dipstick tube. If a new manifold is to be installed, remove the heat shield. Remove the manifold mounting bolts, then lift off the exhaust manifold and its gasket. Check the manifold for cracks and make sure the bolt threads are clean and undamaged. The manifold and cylinder head mating surfaces must be clean before the manifolds are reinstalled-use a gasket scraper to remove all carbon deposits and gasket material. Install the heat shields, then install the bolts and gaskets onto the manifold. Retaining tabs surrounding the gasket bolt holes should hold the assembly together as the manifold is installed. Starting at the fourth thread, apply a 1/4-inch wide band of medium-strength thread-locking compound to the threads of the bolts. Place the manifold on the cylinder head and install the mounting bolts finger-tight. When tightening the mounting bolts, work from the center to the ends. Tighten the bolts in two steps to the proper torque specifications. If required, bend the exposed end of the exhaust manifold gasket back against the cylinder head. The remainder of installation is the reverse of removal. Start the engine and check for exhaust leaks.

Disconnect the cable from the negative terminal of the battery. Raise the vehicle and support it securely on jackstands. Working under the vehicle, apply penetrating oil to the exhaust pipe-to-manifold studs and nuts (they're usually rusty). Remove the inner fender splash shield. Disconnect the exhaust pipe/catalytic converter pipe from the exhaust manifold. Remove the spark plug wires. Use a dab of paint to mark the alignment of the upper section of the steering intermediate shaft to the lower part of the steering column. Remove the fasteners, then separate the shafts so they can be moved aside. Remove the oil dipstick tube. If a new manifold is to be installed, remove the heat shield. Remove the manifold mounting bolts, then lift off the exhaust manifold and its gasket. Check the manifold for cracks and make sure the bolt threads are clean and undamaged. The manifold and cylinder head mating surfaces must be clean before the manifolds are reinstalled-use a gasket scraper to remove all carbon deposits and gasket material. Install the heat shields, then install the bolts and gaskets onto the manifold. Retaining tabs surrounding the gasket bolt holes should hold the assembly together as the manifold is installed. Starting at the fourth thread, apply a 1/4-inch wide band of medium-strength thread-locking compound to the threads of the bolts. Place the manifold on the cylinder head and install the mounting bolts finger-tight. When tightening the mounting bolts, work from the center to the ends. Tighten the bolts in two steps to the proper torque specifications. If required, bend the exposed end of the exhaust manifold gasket back against the cylinder head. The remainder of installation is the reverse of removal. Start the engine and check for exhaust leaks.