Chevrolet 24507848 Cylinder Head Assembly

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.

Before removing the cylinder head, turn the ignition switch to the 'off' position and then turn the negative battery terminal to disable the Theftlock audio system. Third, remove the spark plug wires, assign them a number and the remove the plugs while disposing the engine oil. Loosen and take off all nuts and bolts that hold the brackets in place to the head, disconnect all wires and hoses from the cylinder head(s) as well supplying them with labels for future reconnection. The intake manifold and the exhaust manifold(s) have to be removed from the cylinder head(s) and then the rocker arm cover(s) together with the rocker arms and the pushrods. If the rear cylinder head is to be removed, it is advisable to pull out the alternator for some versions of the car, or the power steering pump for later models, besides, the water bypass hoses and belt tensioner must be removed. untighten the head bolts about 1/4 turn at a time, then remove the head very carefully so as not to scratch the head mating surfaces. After removal it is required to put the head on wooden blocks in order to protect gasket surfaces. However, for installation, the two mating surfaces of the cylinder heads and block must be clean, where the gasket scraper and cleaning with lacquer thinner or acetone is used. Examine the area that is engaged in joining for any form of damage and use a tap to remove any dirt that may be in the thread of the head bolt holes. Install new gaskets over the dowel pins, use of adhesives if required and then put the heads on the block in a manner that does not affect the gaskets. Replace with new head bolts using thread sealer and tighten them as per the recommended steps for three times. Lastly, do the following to reinstall: In the first place, reverse all the steps used in the removal process and also change the oil and filter.

It involves removing the intake and exhaust valves and related components.

Loosen each cylinder head mounting bolt 1/4-turn at a time until they can be removed by hand, storing them in the cardboard holder.

Dirt, corrosion, sealant, and damaged threads can affect torque readings.

HEAD DOES NOT INCLUDE VALVES

Includes head and plug only