Buick 24505662 Manifold Assembly, Lower Intake

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Add coolant, run the engine, and check for leaks and proper operation.

To remove the manifold, start by relieving the fuel system pressure and disconnecting the negative battery cable. Then, remove the plenum, fuel rail, and injectors, and the serpentine drive belt and drain the cooling system. Remove the alternator and loosen the bracket, as well as the power steering pump if equipped. Disconnect the coolant tubes and hoses, and label and disconnect any remaining fuel and vacuum lines and wires from the manifold. Remove the rocker arm covers, followed by the manifold mounting bolts, being careful not to pry between the manifold and heads. Finally, loosen the rocker arm nuts, rotate the rocker arms out of the way, and remove the pushrods that go through the manifold gasket. For installation, ensure the mating surfaces are clean and use a gasket scraper to remove any old sealant or gasket material. Clean the surfaces with lacquer thinner or acetone, and use a vacuum cleaner to remove any debris from the intake ports or lifter valley. Chase the threads in the bolt holes if necessary, and apply a bead of ATV sealant or equivalent to the front and rear ridges of the engine block. Install the intake manifold gasket, pushrods, and rocker arms. Carefully lower the manifold into place and install the mounting bolts/nuts finger tight. Tighten the mounting bolts/nuts in three steps, working from the center out in a crisscross pattern. Finally, reinstall the remaining components, change the oil and filter, refill the cooling system, and start the engine to check for leaks.

The first step is to relieve the fuel system pressure and disconnect the negative battery cable.