GMC 12641701 Cylinder Head Kit

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It will be necessary to purchase a new set of 11 mm cylinder head bolts. Begin by relieving the fuel system pressure and disconnecting the cable from the negative battery terminal. Drain the cooling system. For 3.0L models and 2013 and later 3.6L models, remove the power brake booster pump and secure it out of the way. Remove the intake manifold(s), valve covers, and upper timing chains. Disconnect the ground wires from the heads; for the left cylinder head, remove the dipstick tube and disconnect the electrical connector from the Engine Coolant Temperature sensor, and for the right head, detach the power steering hose clip and disconnect the oxygen sensor electrical connector. On 2009 and earlier 3.6L engines, disconnect the catalytic converters from the exhaust manifolds, as the heads can be removed with the exhaust manifolds attached. Remove the camshaft position actuator solenoid valves. For 2013 and later 3.6L models, when removing the left side cylinder head, remove the high-pressure fuel pump and then the oil dipstick tube fastener and tube. Loosen the head bolts in 1/4-turn increments in the reverse order of the tightening sequence until they can be removed by hand, noting that there will be different lengths and sizes of bolts in different locations. Carefully lift the heads off the engine block, using a prybar cautiously if resistance is felt, and store the heads on wooden blocks to prevent damage. The mating surfaces of the cylinder heads and block must be perfectly clean when reinstalling the heads, using gasket removal solvents and a gasket scraper to remove all traces of carbon and old gasket material, followed by wiping with a cloth saturated with brake system cleaner. Check the block and head mating surfaces for nicks and scratches, using emery cloth for slight damage, while excessive damage may require machining. Use a tap of the correct size to chase the threads in the head bolt holes or spray brake cleaner and use compressed air to remove debris. Position the new gaskets over the dowels in the block and carefully position the heads on the block without disturbing the gaskets. Always replace 8 mm or 11 mm head bolts. Before installing the new 8 mm head bolts, coat the threads with a medium-strength thread locking compound and install them finger tight. Install new 11 mm head bolts and tighten them finger tight, then follow the recommended sequence to tighten the bolts to the specified torque and angle of rotation. Tighten the 8 mm bolts to the specified torque and angle of rotation. The remainder of the installation is the reverse of removal. Finally, change the engine oil and filter, refill the cooling system, start the engine, and check for proper operation and any coolant or oil leaks.

It will be necessary to purchase a new set of 11 mm cylinder head bolts. Begin by relieving the fuel system pressure and disconnecting the cable from the negative battery terminal. Drain the cooling system. For 3.0L models and 2013 and later 3.6L models, remove the power brake booster pump and secure it out of the way. Remove the intake manifold(s), valve covers, and upper timing chains. Disconnect the ground wires from the heads; for the left cylinder head, remove the dipstick tube and disconnect the electrical connector from the Engine Coolant Temperature sensor, and for the right head, detach the power steering hose clip and disconnect the oxygen sensor electrical connector. On 2009 and earlier 3.6L engines, disconnect the catalytic converters from the exhaust manifolds, as the heads can be removed with the exhaust manifolds attached. Remove the camshaft position actuator solenoid valves. For 2013 and later 3.6L models, when removing the left side cylinder head, remove the high-pressure fuel pump and then the oil dipstick tube fastener and tube. Loosen the head bolts in 1/4-turn increments in the reverse order of the tightening sequence until they can be removed by hand, noting that there will be different lengths and sizes of bolts in different locations. Carefully lift the heads off the engine block, using a prybar cautiously if resistance is felt, and store the heads on wooden blocks to prevent damage. The mating surfaces of the cylinder heads and block must be perfectly clean when reinstalling the heads, using gasket removal solvents and a gasket scraper to remove all traces of carbon and old gasket material, followed by wiping with a cloth saturated with brake system cleaner. Check the block and head mating surfaces for nicks and scratches, using emery cloth for slight damage, while excessive damage may require machining. Use a tap of the correct size to chase the threads in the head bolt holes or spray brake cleaner and use compressed air to remove debris. Position the new gaskets over the dowels in the block and carefully position the heads on the block without disturbing the gaskets. Always replace 8 mm or 11 mm head bolts. Before installing the new 8 mm head bolts, coat the threads with a medium-strength thread locking compound and install them finger tight. Install new 11 mm head bolts and tighten them finger tight, then follow the recommended sequence to tighten the bolts to the specified torque and angle of rotation. Tighten the 8 mm bolts to the specified torque and angle of rotation. The remainder of the installation is the reverse of removal. Finally, change the engine oil and filter, refill the cooling system, start the engine, and check for proper operation and any coolant or oil leaks.

Head has to be removed on a cooler engine to avoid warpage of the head. Head bolts are also necessary to install; thus, it is necessary to buy new ones in advance. The process commences with the removal of pressure from the fuel system to ensure that no accident occurs and the cable is disconnected from the Negate battery terminal. Suction the cooling system and the oil sump; then unplug the Powertrain Control Module. Remove hose clamps and hoses from the coolant outlet housing, undo the housing bolts and then remove the housing. B, eremove valve cover, turbocharger assembly and intake manifold. For the 2.0L and 2.5L engines, take off the exhaust manifold, timing chain cover and timing chain: support the engine at the lower end of the engine mount. Take out the high pressure fuel pump, and, if you're working on the 2.0 L and 2.5 L engines, you should also remove the camshaft position actuators, and cams. Identify and disarm the electrical connectors from the cylinder head that could be possibly cumbersome in removal, note down each connector for easy reconnection. Loosen the cylinder head bolts in the specified order turning it in small amounts. Drive a pry bar along the wide flat area all around the head-to-block mating surface but you should not pry in the gasket sealing area. Place an engine hoist lifting bracket and chains at the cylinder head, then use the hoist to lift the cylinder head up off the engine, if it is hard to lift use a wood block and hammer to apply leverage. Place the cylinder head on wooden pillows so as not to scratch the gasket sealing surfaces as you remove the old cylinder head gasket having in mind its positioning as when being fitted. Before installation of the cylinder head and block, the mating surfaces need to be immaculately clean; therefore, using gasket scraper and brake system cleaner. Ensure that the mating surfaces are free from any form of damages like nicks, deep scratches and others. Wash the threads in the cylinder head bolt holes with a tap since this practice may including dirt and corrosion that might alter the torque value read. Align the new gasket with the dowels in the block, locate the cylinder head over the engine block with out shifting the gasket and fit new cylinder head bolts then tighten these bolts to the standard torque level in the correct sequence. Fit the timing chain, turb charger or exhaust manifold and intake manifold. The other steps that are needed to be taken for installation is the exact opposite of the removal process. Connect the battery, drain the engine oil and replace it with a new one, refill the cooling system, then crank the car and look out for the leakage of oil and antifreeze mixture.

Install the new cylinder head bolts and tighten them in the recommended sequence to the specified torque, followed by turning each bolt the specified angle.

It is possible to remove the cylinder head without taking off the timing chain cover and timing chain completely by using special tools, but it is recommended to remove them for easier access.

Label and disconnect the electrical connectors from the cylinder head that may interfere with removal, using tape to mark each connector for correct reassembly.

Install the new cylinder head bolts and tighten them in the recommended sequence to the specified torque, followed by turning each bolt the specified angle.

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