GMC 10172857 Exhaust Manifold Assembly

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Remove the cable from the negative battery terminal. Remove the air cleaner assembly and duct. Remove the oxygen sensor from the manifold. Raise the vehicle and securely support it on jackstands. Disconnect the exhaust pipe from the exhaust manifold. You may need to apply penetrating oil to the fastener threads as they are usually corroded. On air-conditioned models, remove the air conditioning compressor rear mount, and remove the nut and the oil filler tube without disconnecting the lines. Remove the nut on the oil filler tube assembly. Remove the exhaust manifold nuts and separate the exhaust manifold from the engine. Remove the exhaust manifold gasket. Before installing the manifold, clean the gasket mating surfaces on the cylinder head and manifold. Remove all old gasket material and carbon deposits. Check the bolt threads for damage. Place a new exhaust manifold gasket in position on the cylinder head, then place the manifold in position and tighten the mounting nuts. Install the remaining components in the reverse order of removal. Start the engine and check for exhaust leaks between the manifold and cylinder head, and between the manifold and exhaust pipe.

The air conditioning compressor rear mount should be removed, and the nut and oil filler tube should be removed without disconnecting the lines.

After reassembling the remaining components, it is important to check for exhaust leaks when starting the engine.

On the right side manifold, the air cleaner assembly and the heat stove pipe on TBI models need to be removed.

Before removing the nuts, it is recommended to apply penetrating oil to the exhaust pipe-to-manifold studs and nuts.

The oxygen sensor.

Penetrating oil should be applied to the fastener threads.

On the left side manifold, the rear brace from the alternator, spark plug wires, and EGR pipe on 1996 and later models need to be removed.