Mopar 4648619 Valve Guide Seal

Broken valve springs and defective valve stem seals can be replaced without removing the cylinder heads, typically requiring two special tools and a compressed air source. Begin by removing the valve cover and the spark plug from the affected cylinder, or all spark plugs if replacing all valve stem seals. Turn the crankshaft until the piston in the affected cylinder is at top dead center on the compression stroke, and if replacing all seals, start with cylinder number one, working through the firing order. Thread an adapter into the spark plug hole and connect an air hose from a compressed air source; many auto parts stores supply the necessary adapter. Remove the rocker arms and apply compressed air to the cylinder. Stuff clean shop rags into the cylinder head holes above and below the valves to prevent parts and tools from falling into the engine, then use a valve spring compressor to compress the spring and remove the keepers with small needle-nose pliers or a magnet. Remove the spring retainer and valve spring, then take out the valve guide seal/spring seat assembly, being cautious that if air pressure fails to hold the valve closed, the valve face or seat may be damaged, necessitating cylinder head removal for further repairs. Wrap a rubber band or tape around the top of the valve stem to prevent it from falling into the combustion chamber, then release the air pressure. Inspect the valve stem for damage, ensuring it rotates freely in the guide without binding; if it does bind, the valve may be bent or the guide damaged, requiring head removal for repair. Pull up on the valve stem to close it, reapply air pressure to retain it in the closed position, and then remove the tape or rubber band. Lubricate the valve stem with engine oil and install a new valve guide seal/spring seat assembly, tapping it into place with a deep socket. Position the spring over the valve, install the valve spring retainer, compress the spring, and carefully position the keepers in the groove, applying a small dab of grease to hold them if necessary. Remove the pressure from the spring tool and ensure the keepers are seated, then disconnect the air hose and remove the adapter from the spark plug hole. If applicable, install the spark plug tubes for 2.0L engines, followed by the rocker arms, spark plug(s), and wire(s). Finally, install the valve cover, start the engine, and check for oil leaks and unusual sounds from the valve cover area.

Valve spring failure and valve stem seals can be repaired by replacing them without the removal of the cylinder head; it normally requires two special tools and compressed air. Start with the elimination of a proper valve cover, the rocker arm assemblies then spark plugs from that certain head. Place the car's piston of the malfunctioning cylinder at the topmost position of the compression stroke; begin with cylinder number one and crank on one cylinder to the other, following the firing order sequence of the engine. Insert an adapter into the spark plug hole and attach an air hose to compressed air supply. Use compressed air to blow out debris within the cylinder and use clean shop rags to plug the cylinder head holes over the valves and under them with a view of avoiding loss of small parts and tools inside the engine. This is done using a valve spring compressor tool to compress the spring then quickly remove the keepers applying the use of small needle-nose pliers or a magnet to pick the retainers and the valve spring. Take off the valve guide seal and the spring seat lifting because if air pressure is not strong enough to keep the valve closed the valve face and or seat can be damaged and requires the removal of the cylinder head for further repair works. Tightly coil a rubber band or metallic tape around the top of the valve stem so that it doesn't drop in the combustion chamber then minimize air pressure and assess the condition of the valve stem. Turn the valve in the guide and try to move it along an elliptical race; if it sticks the head will have to be pulled out and re-machined. Raise the valve stem upward in order to shut the valve, use air pressure to maintain the latter state, and then take off the tape/rubber band. Put the valve spring seat and lubricate the valve stem with clean engine oil, and then put the new valve guide seal and drove it into place with a deep socket. Place the spring over the valve, put the valve spring retainer in position, compress the spring and put the keepers into the groove and if they do not sit into the groove securely apply small amount of grease. Take the pressure off the spring tool, make sure the keepers are in place, shut off the air hose and quickly, but carefully, unscrew the adapter from the spark plug hole. Do the same for any other defective valves, set in the rocker arm assemblies, spark plug, and connect the wire(s) and then put back the valve cover. Last of all turn on the ignition and the engine to look at the oil streaks and odd noises from the valve cover engine area.

Valve springs often break or valve stem seals are faulty and can be changed without having to remove the cylinder heads; the tools used are usually 2 and an air compressor. Start with the procedure byfirst, unscrewing of the valve cover(s) together with the rocker arms, on the cylinder head of the damaged engine. Subsequently, unscrew the spark plug from the cylinder to which the faulty part is installed, and if all stem seals will be changed, unscrew all spark plugs and lay aside the rocker arms. Rotate the crankshaft to bring the piston in the damaged cylinder at the TDC and if replacing all the valve stem seals then begin with cylinder no. 1 and do cylinder by cylinder following the firing order. Insert a long adapter through the spark plug hole, attach an air line connected to a source of compressed air if you are conducting the exercise with a long spark plug adapter with a hose fitted. Expand the cylinder with 90 to 100 pounds of compressed air, and then shove the shop rags into the cylinder head holes surrounding the valves to maintain order to the working area hence to stop tools and parts get into the engine. With the help of a valve spring compressor, compress the spring, and, using small needle-nose pliers or a magnet, remove the valve stem locks and, at the same time, it is important to recall that air pressure should keep valves in place. If the valves cannot retain the air, it will be advisable to remove the cylinder head for re-working the valves. The spring retainer and the valve spring should be taken out, along with the valve stem seal, and the valve springs should be labelled and stored for reuse. Another step is to twist a rubber band or a strip of tape round the end of the valve stem in order not to lose it inside the combustion chamber and then to open the air supply. Examine the valve stem for signs of wear, particularly in the region where it engages the guide; if the head is loose and the stem binds in the guide it will be necessary to remove the head to the repair the surface. Apply pressure on the air to keep the valve closed and after apply the pressure, remove the tape or rubber band. Apply engine oil on the valve stems and position the valve spring seal into place on top of the value stems applying a gentle pressure on them to make sure that in one position they do not twist or cock all over. Place the spring and retainer over the valve with the coloured mark up and the assembly must be compressed a little only to get the keepers fitted in the valve stem. Place the keepers into the valve stem groove, however these can be remove and reinstalled many times and so a small quantity of grease can be applied in the groove hole to hold the keeper into place, the spring tool has to be released off from the stem to make sure that the keepers are set in position. Remove airscrew and uncouple the air hose from the spark plug hole in the same procedure as before, while bringing each piston to T.D.C on the compression stroke before applying the airscrew. Last of all, bolt on the rocker arms, the valve covers, the spark plugs and the ignition coils and start the engine and check for any signs of oil leakages and other strange noises emanating from the valve cover bowl.