GMC 12556053 Engine Exhaust Manifold, Rh

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To take off the exhaust manifold, first disconnect the negative battery cable and lift the vehicle on jackstands. Apply penetrating oil to the exhaust pipe-to-manifold studs and nuts then remove the nuts which hold the exhaust pipe(s) to the manifold(s). On TBI models, this will involve removing the air cleaner assembly and also heat stove pipe on right side manifold. Disconnecting spark plug wires and brackets as well as unbolt air conditioning compressor with its bracket then leave only one screw that you loosened for last. Remove oil dipstick and tube bracket. Removing rear brace from alternator (unbolt), spark plug wires, EGR pipe (1996 and later models) etc. Take out power steering pump pulley after removing rear power steering bracket by removing mounting bolts. Bend lock tabs back, then remove mounting bolts followed by separation of exhaust from cylinder head. Clean both surfaces where manifold mates with cylinder head. Place it over cylinder head onto which it is mounted with installing three fastening screws in a sequence which divides them into three equal parts. Reassemble everything else that remains and make sure there are no leaks when cranking up engine.

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.

The exhaust pipe.

The air cleaner assembly and duct.

The manifold should be placed in position and the mounting nuts should be tightened.

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

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