Genuine GMC Terrain Intake Manifold

GMC Terrain Intake Manifold Parts Questions & Experts Answers

• Manifold Assembly, Upr Int
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  Q: How to disconnect and remove the intake manifold and its components in 3.4L V6 engine on GMC Terrain?

  A: Disconnect the cable from the negative terminal of the battery and remove the engine cover. Disconnect the brake booster vacuum tube from the intake manifold, then disconnect the front spark plug wires from the spark plugs and the bracket. Remove the ignition coil along with its bracket, positioning it out of the way, and remove the air intake duct. Unbolt the heater outlet tube from the top of the engine and move it aside without disconnecting the heater hoses. Remove the EGR tube and the PCV tube, then unscrew the alternator mounting bolt closest to the intake manifold, allowing it to remain in place but pulled out about an inch. Remove the alternator bracket into which the mounting bolt was threaded, loosening the upper alternator mounting bolt and sliding it out far enough to remove this bracket. Remove the spark plug wire retainer from the top of the intake manifold, disconnect the MAP sensor, and any remaining interfering components. Loosen the upper intake manifold bolts gradually, starting with the outer bolts and working towards the inner bolts, then remove the upper intake manifold with the throttle body attached. Clean the mounting surfaces of the lower and upper intake manifolds with brake system cleaner, removing all traces of old gasket material or sealant. Install the new gaskets over the lower intake manifold, then install the upper intake manifold onto the lower intake manifold, tightening the bolts gradually, starting with the inner bolts and working towards the outer bolts, to the specified torque. Drain the cooling system and relieve the fuel system pressure before removing the upper intake manifold. Disconnect the heater core inlet hose from its tube at the engine, unbolt the tube, pull it out of the socket, and remove it. Remove the upper radiator bracket from the radiator, the radiator inlet hose, and the fuel rail. Remove the valve covers, loosen the Rocker Arm bolts, rotate the rocker arms out of the way, and remove the pushrods that go through the manifold gaskets. Loosen the manifold mounting bolts/nuts in 1/4-turn increments until they can be removed by hand. The manifold may be stuck to the cylinder heads, requiring force to break the gasket seal; pry the manifold loose at a casting boss, avoiding prying between the gasket surfaces to prevent damage. Lift the old gaskets off, use a gasket scraper to remove all traces of sealant and old gasket material, and clean the mating surfaces with brake system cleaner. Ensure the mating surfaces of the cylinder heads, block, coolant crossover housing, and manifold are perfectly clean when the manifold is installed. Use a tap of the correct size to chase the threads in the bolt holes if necessary, then use compressed air to remove debris from the holes, wearing safety glasses for protection. Place the intake manifold gaskets in position on the heads, install the push rods and rocker arms, and apply a 3/16-inch bead of RTV sealant to the front and rear ridges of the engine block between the heads, as well as to the end ridges between the cylinder heads. Carefully lower the manifold into place and install the mounting bolts/nuts finger tight, coating the bolt threads with thread-locking liquid before installation. Tighten the four vertical bolts at the center of the manifold in the recommended tightening sequence to the specified torque, followed by the four angled bolts at the ends of the manifold. Install the remaining components in the reverse order of removal, refill the cooling system, start the engine, and check for leaks.