Lincoln 3L3Z-6571-DA Valve Stem Seal

Valve-spring and valve-stem-seal wear and failure can be remedied without having to pull the heads because of factory tools for removing the valve springs as well as the seals with the camshaft in the head. A second procedure employs a tool that is more readily procurable from a mainstream automobile store, but in this method, the camshaft should be withdrawn in order to get access to the valve spring. Indeed, it will produce similar results, but the manufacturer's method is less complicated if the proper equipment is obtained. This may require compressed air, which should be assembled before the procedure takes place. Therefore, it is always the best practice to assemble all the tools that are needed for the particular operation. The procedure starts with the undoing of the valve cover and the spark plug of the cylinder in question, rotating the crankshaft until a piston comes to a TDC on compression as well as screwing an air hose adaptor into a spark plug hole. The valves are then closed with the help of compressed air and the cylinder head holes with small shop rags to avoid dropping of parts into the engine. Besides using special tools, there is a need of a valve spacer whenever compressing the spring in a manner that may adversely affect the valve seal. The rocker arm is pulled off and the keepers are then pulled with the help of pliers or a magnet as the spring is compressed. The spring retainer, the valve spring, and the valve stem seal are then taken out and if air pressure cannot retain the valve then further repair works may be required. For the other method, realistically the camshaft has to be unbolted from the head to fit a clamp style valve spring compressor and then the same process as the shoe style. In installation, a rubber band or tape is used to fasten the valve stem In case of a damaged valve, it is replaced. Following lubrication of the stem of the valve and the replacement of the seal, the retainer for the spring of the valve is placed, and the keepers fastened. Finally, the air hose is removed and the spark plug is replaced and the engine is being cranked in order to see if there are any signs of leakage and or funny noises.

Valve Springs and valve stem seals are fairly simple therefore damaged ones can be changed without having to bare the cylinder heads and it usually require only two special tools and compressed air source. Start by taking off the valve cover of the cylinder head you suspect to have problems, although if all valve stem seals will be replaced, both covers should be removed. Subsequently, extract one of the spark plugs from the one cylinder with the damaged component and if replacing all the seals, to and remove all of the spark plugs. Adjust the crankshaft until the piston of the cylinder that has been identified to have the issue is positioned at the Top Dead Center at the compression stroke and should begin with cylinder number one and then follow the firing sequence. Insert an adapter into the spark plug hole together put an air hose connected to a compressed air. Depower the valve with the bad section and pull out the pushrod and the associated bolt, fulcrum, and rocker arm. Use compressed air to the cylinder and both valves should remain fixed on the cylinder. Work a rag into the cylinder head holes to keep parts from falling into the engine; to remove the keepers use a valve spring compressor and pull the spring to allow you to remove the keepers with needle nose pliers or magnet. In the event that the air pressure will not close the valve, there is possibility that the face or seat of the valve will be harmed or damaged, where the additional process of pulling the cylinder head will take place. Put a rubber band or tape around the head of the valve stem to ensure that the valve doesn't fall into the combustion chamber, then deflate it. Check the valve stem for sign of wear, it must rotate smoothly and the binding should not be present. Apply pressure on the valve again so they remain closed, finally remove the tape or rubber band that was used. Remove the old rubber guide seal wash the grease from the stem and lubricate it and install a new guide seal in addition to the spring and retainer. Compress the cover of the valve spring and place the keepers in the groove, and put a little grease to prevent the Keepers from falling. Take off the spring tool pressure and the keepers should seat themselves, after which the air hose and the adapter should be disconnected. The rocker arm(s) should be reinstalled, then the push rod(s), spark plug(s) and wire(s) should then be put back on and closed off with the valve cover(s). Open the hood and turn ignitions and examine for signs of oil seepage and any funny noises originating from the top of the engine.

8 per pack