Question 1

How to remove and install cylinder heads in V8 engine on Pontiac Firebird?

Accepted Answer

Locate the engine block drain plugs at the center of the block on each side, remove the plugs, and drain the coolant. Remove the intake manifold and the exhaust manifolds. Take off the lower power steering pump adjusting bracket from the left-side cylinder head if it has not been previously removed, and also remove the lower alternator mounting bolt from the right-side cylinder head. Remove the rocker arm covers and loosen the rocker arm nuts enough to allow removal of the pushrods, storing them separately to ensure they can be reinstalled in their original positions, possibly using a cardboard box with numbered holes. Remove the head bolts in a sequence opposite to the tightening sequence and then remove the cylinder head(s), breaking the gasket seal by inserting a bar into one of the exhaust ports and carefully lifting. If a new cylinder head is being installed, transfer the external components from the old head to the new head. Before installing the head(s), ensure the gasket surfaces on both the head and engine block are clean and free of nicks and scratches, and that the threads in the block and on the head bolts are completely clean to avoid affecting the bolt torque. When installing the cylinder heads on engines using a plain steel gasket, coat both sides of the new gasket with a good quality sealer made expressly for head gasket installation, using a paint roller for an even coat of the proper thickness, as too much sealer may hold the gasket away from the head or block. Avoid using sealer on engines requiring a composite-type steel/asbestos gasket. Place the gasket in position over the dowel pins with the bead up, then position the cylinder head over the gasket. Coat the cylinder head bolt threads with an appropriate thread sealer and install the bolts, tightening them in the proper sequence to the specified torque, working up to the final torque in three steps. Install the pushrods, ensuring the lower ends are in the lifter seats, place the rocker arm ends over the pushrods, and loosely install the rocker arm nuts. The remaining installation steps are the reverse of removal, and before installing the rocker arm covers, adjust the valve lash.

Question 2

How to remove and install a cylinder head in V6 engine on Pontiac Fiero?

Accepted Answer

Raise the vehicle and place it securely on jackstands, then remove the engine block drain plug to drain the coolant. After lowering the vehicle, remove the intake manifold and exhaust crossover pipe, followed by the alternator and bracket. Remove the oil level indicator tube and rocker arm cover, then loosen the rocker arms to swing them out of the way before removing the pushrods, storing them systematically for reinstallation. Remove the cylinder head bolts by reversing the tightening sequence and take off the cylinder head. If installing a new cylinder head, transfer components from the old head, ensuring all gasket surfaces are clean and free of debris, and recondition the bolt threads. Position the gasket over the locating dowels, place the cylinder head over the gasket, coat the bolt threads with sealer, and install the bolts, tightening them in the proper sequence to the specified torque in three steps. Install the pushrods, ensuring the lower ends are in the lifter seats, then loosely install the rocker arm nuts and adjust the valve lash. Install the intake manifold and gaskets, tightening all bolts to the specified torque, attach the oil level indicator tube bracket, install the heat stove pipe and air supply pipe, and then attach the alternator bracket and stud. Install the exhaust pipe and crossover pipe, and fill the cooling system with coolant, noting not to add coolant if the rear cylinder head is also being removed. For the rear, repeat the process of raising the vehicle and draining the coolant, disconnect the exhaust pipe from the manifold, and remove the cruise control servo bracket if equipped. Remove the intake manifold and exhaust crossover pipe, loosen the rocker arm nuts to remove the pushrods, and then loosen the head bolts by reversing the tightening sequence to remove the cylinder head. Transfer components from the old head if a new one is being installed, clean all gasket surfaces, and place the new gasket in position. Position the cylinder head over the gasket, coat the bolt threads with sealer, and install the bolts, tightening them in the proper sequence to the specified torque in three steps. Install the pushrods, ensuring the lower ends are in the lifter seats, loosely install the rocker arm nuts, and adjust the valve lash. Install the intake manifold and gaskets, the exhaust crossover pipe, and the cruise control servo bracket. Finally, raise the vehicle again to connect the exhaust manifold to the exhaust pipe, lower the vehicle, adjust the drivebelts, and fill the cooling system.

Question 3

What precautions should be taken before beginning the engine procedure, and what are the steps involved in removing and installing the cylinder head in 2.2L four cylinder engine on Pontiac Grand Prix?

Accepted Answer

This should be done after the engine has reached room temperatures and after you have switched off the engine. Previously to cylinder head removal, on vehicles with high overall mileage and during the engine overhaul camshaft lobe height should be checked. First disarm the fuel system and open the negative terminal from the battery while the Theftlock audio system of the vehicle must be turned off. These are the next procedures; first, a gen3 alternator and brackets are pulled out and then the intake and exhaust manifolds. Remove the drivebelt tensioner bracket and the power steering pump; the component can be positioned to the side of the car without having to disconnect its hoses. Detaching any remaining wires, hoses, fuel and Vacuums lines to the cylinder head and tag them appropriately for reconnection. Pull the wires off the spark plugs and remove the spark plugs if you are able to label the wires beforehand. First of all, the valve cover, rocker arms and pushrods has to be unwired. To ensure that the head bolts shall not mix up, write and mark the cylinder and bolt pattern on a thin piece of cardboard, use this as a guide and remove the cylinder head mounting bolts slowly by ¼ turn until they can be removed and put in the corresponding holes in the cardboard. If needed use a hammer with a block of wood and gently lift the head off the engine to remove the cylinder head gasket. In case a new cylinder head is to be fitted then all the extra hardware from the old head must to be transffered to new head and a clean and proper gasket surface of the cylinder head as well as of the engine block should be free from any oily and dirty particles but should not be damaged. Check that the small threads of the head bolts and the large threads of the holes in the engine block are free from debris, and clean them with a die and tap if necessary. Put the gasket over the engine block dowel pins paying attention to the orienting marks and gently lowering the cylinder head on the engine block. Some of the bolts are tightened just enough so that they do not fully seat into place-this will later be tightened from where they are just a little loose, to 1/4 turn increments in the recommended pattern with the use of a special tool on the bolts where the tops have been marked with a felt-tip marker. The remaining process is the inverted procedure of the removal process and do not forget to fill the cooling system and replace the oil filter.

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