GMC 14054884 Cylinder Head

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dealership and auto parts stores, new and rebuilt cylinder head for most types of engines are available. For some of the described disassembly and inspection procedures certain specific tools are required, and, since the spare parts are not always easy to come by it may be less time consuming and less costly to buy a new head altogether. Cylinder head disassembly entails the following; the elimination of the intake and exhaust valves and other related parts. The next step require the removal of the rocker arms, so use the nut/bolt and rocker arm's socket to remove the nuts/bolts and come off the head from the rocker arms, make sure to put a tag on your nut/bolt or write on it and keep all rocker parts separate so that in the future during reassembly it will be very easy to fit it back again in the original style. Check valve spring installed height for each valve and compare with that of the standard length, This can be done by measuring from the head surface or shim to the underside of the retainer. Don't forget to take the measurement of its height again after discharging all the springs but before reassembling all the piece together of the valve in the head inclusive of the springs. If loss of height is likely to be a problem, a piece of welding rod or stiff wire can be measured off to the standard length indicated. Remove the keepers while the valve spring is still clamped in the spring compressor by using another fork to push down the retainers so that you can extract the shield, spring, valve guide seal, if any springs seat shim, and valve from the head. I appreciate it and For a valve that binds and will not pull through the head, the procedure is to push it back in and take a fine file or whetstone and debur the region around the keeper groove. Do the same for all the valves; organize and label the valve spring assemblies as they are removed for future replacement. When all the valves are removed and properly stowed, wash and examine the head undertaking such other procedures on the engine that are required prior to washing the head.

Use parts cleaner to remove all sludge and dirt from the rocker arms, rocker balls, pushrods, and valve springs, working on one set of components at a time and returning each set to its numbered location on your box or rack.

After the intake manifold, the exhaust manifolds should be removed.

For L4 engines, torque the rocker arm nuts/bolts to specifications.

Check the cylinder head for warpage with a straightedge and feeler gauge.

If necessary, use 1/16-inch shims under the valve spring to achieve the proper specifications, but avoid shimming to a height below the minimum specified length; if the spring is too short, replace it with a new one.

Place a valve in its installed position with the valve head slightly off its seat, attach a dial indicator to the head, and move the valve side to side to note the movement on the dial indicator. Divide this measurement by two for the actual clearance.

Disconnect all electrical and vacuum lines that would interfere with cylinder head removal, ensuring to label the lines for their locations.

Place each valve lifter back into its proper bore using 'Molykote' or an equivalent coating.

An additional valve spring seat shim can be installed to achieve the correct height, but caution must be taken not to shim the springs to a point where the installed height is less than specified.

Insert a valve into the appropriate port, and push a new seal fully over the valve stem, seating it in the cylinder head.

A buffing wheel should be employed to eliminate all carbon deposits from the valves, ensuring the order of the valves is not mixed up during cleaning.

Decide whether to overhaul the cylinder heads yourself, exchange them for new or rebuilt units available at GM dealers or auto parts stores, or take them to a competent machine shop or GM dealer for the overhaul process.

Check the cylinder head for warpage by placing a straightedge across its length and measuring gaps with a feeler gauge at three points across the head gasket surface and diagonally.

Install the spark plug wires on the rocker arm cover studs and connect the wires using pieces of tape as a guide.

Install the pushrods, ensuring the lower ends are in the lifter seats, then loosely install the rocker arm nuts and adjust the valve lash.

Finally, place the heads on wood blocks to prevent damage.

Remove the air cleaner assembly, tagging each hose with numbered or colored tape for reassembly.

New and rebuilt cylinder heads are commonly available for GM engines at dealerships and auto parts stores, making it practical and economical for home mechanics to purchase replacement heads and install them.

Inspect each valve face for cracks, pits, and burned spots, checking the valve stem for cracks and wear, and rotate the valve to check for bending.

Store the pushrods separately to ensure they can be reinstalled in their original positions, possibly using a cardboard box with numbered holes.

Compress the spring and install the O-ring seals in the lower valve stem groove, ensuring they are not twisted, with a light coat of oil to prevent twisting.

Disassembly involves removing the intake and exhaust valves along with their related components. If they are still in place, the nuts or bolts and pivot balls should be removed to separate the rocker arms from the cylinder head, with all parts labeled or stored separately for reinstallation.

Remove the rocker arm cover, breaking the gasket seal if necessary by striking the cover with your hand or a rubber hammer without prying between sealing surfaces.

Check the rocker arm faces for wear, inspect pushrod ends for scuffing, and roll the pushrod on a flat surface to check for bending.

Coat the cylinder head bolts with an appropriate thread sealer, install them, and tighten in the proper sequence to the specified torque, working up to the final torque in three steps.