Pontiac 10182321 Engine Exhaust Manifold

When replacing the exhausted manifold, you should follow these steps, The first thing that need to done is to unscrew the negative battery terminal; if there is an audio system with Theftlock system, make sure to turn it off. Then, disconnect the harness connector and oxygen sensor and then take off the manifold heat shields. Lift the car with jackstands safely and unbolt the exhaust pipe to manifold joint using a combination of penetrating oil, applying torque in left and right random cycle. Then unbolt the exhaust manifold brace and then loosen the nuts of the exhaust pipe flange from the manifold studs by pulling the pipe downwards slightly to ease off. Tighten the exhaust manifold mounting nuts an eighth of a turn clockwise each time from inside until they cannot be tightened any further, then remove the manifold bolts and remove the manifold from the head. Installation requires the mating surfaces of the manifold and cylinder head to be clean, use of gasket scraper to remove old gasket material and carbon deposits contour. A new gasket should be put in place, the manifold fasteners should be tightened by hand and then by a prescribed torque in the recommended sequence Finally other procedures will have to be reversed in the order of removal.

To start with, to be safe remove the negative terminal of the battery, as well as if the car you are working on is fitted with Theftlock audio system, make sure that the lockout feature is off. Then, disconnect the electrical connection of the oxygen sensor and, finally, unmould the drivebelt and the alternator. Subsequently remove the torque rod, lift the front of the vehicle and securely place it on jackstands applying the parking brake and placing blocks behind the rear wheels. Remove the nuts on the exhaust pipe and the manifold then lower the car. Go on to remove the oil level indicator tube followed by the removal of the exhaust manifold-to-cylinder head nuts or bolts, then pull the manifold away from the engine and up out of the flange of the exhaust pipe, dispose of the gasket used here. Remove all the remaining gasket materials from the mating surfaces of the exhaust manifold and head of cylinder. Regarding installation: Thoroughly clean all bolt and stud threads, the manifold mounting studs for example should be wire brushed, whereas cylinder head bolt holes should be tapped. In the case where a new manifold is replaced, the oxygen sensor is relocated from the former manifold. Last but not the least, reverse the above steps and fit a new manifold, but this time you will require a new gasket and tighten the bolts in the right pattern and to the prescribed torque.

Raise the vehicle and securely support it on jackstands.

The final steps for installing the exhaust manifold are:Ensure the use of a new gasket.Tighten the nuts/bolts.Work in a spiral pattern from the center out to evenly distribute the torque.

Disconnect the negative battery cable and remove the air cleaner assembly, inlet hose, and mass air flow sensor. Allow the engine to cool and drain the coolant. Disconnect the coolant bypass tube if needed.

1. Disconnect the negative battery cable. 2. Remove the air cleaner assembly, hot-air pipe, and hot-air shroud. 3. Remove the generator or air conditioning brackets where they attach to the exhaust manifold. 4. Disconnect the exhaust pipe where it connects to the exhaust manifold flange, using penetrating oil if needed. 5. Pry back the metal retainers from the bolt heads. 6. Remove each of the bolts securing the exhaust manifold. 7. Remove the manifold from above, noting that on some late models it may be necessary to disconnect the intermediate shaft of the steering column for better access.

Reinstall the remaining components in the reverse order of removal, ensuring to use a new gasket or packing at the crossover pipe flange.

Take the manifold to an automotive machine shop for resurfacing.

Remove the air cleaner assembly, followed by the exhaust crossover pipe from the manifold.

If a new manifold is being installed, transfer the oxygen sensor from the old manifold to the new one.

1. Repeat the battery disconnection. 2. Drain the coolant. 3. Remove the mass airflow sensor, air duct, and crankcase ventilation pipe if needed. 4. Remove the nuts attaching the crossover pipe to the rear exhaust manifold. 5. Disconnect the spark plug wires from the rear spark plugs. 6. Remove the EGR pipe and transaxle dipstick tube if obstructing access. 7. Unbolt the power steering pump without removing the hoses. 8. Detach the alternator support bracket. 9. Remove the heater hoses and coolant tube brackets above the exhaust manifold. 10. After removing the exhaust manifold heat shield and engine lifting bracket, detach the IAC wiring from the throttle body. 11. Set the parking brake, block the rear wheels, and raise the front of the vehicle securely on jackstands. 12. Under the vehicle, remove the two exhaust pipe-to-manifold bolts. 13. Disconnect the oxygen sensor electrical connector at the rear manifold. 14. Remove the oxygen sensor to prevent damage during manifold removal. 15. Finally, remove the six bolts to detach the manifold from the head.