Ford F4TZ-6571-A Seal - Valve Stem

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Some of the damages such as broken valve springs and faulty valve stem seals can be fixed without having to remove the cylinder head; this can only be done with two special tools and a source of compressed air. If there is no compressed air at the workers' disposal, it is possible to employ a piece of nylon string in order to stop the valves to fall into the cylinder. Starts with the cylinder head and spark plug of the particular cylinder being procured and by then rotate the crankshaft in order to align the piston at the TDC of the compression stroke. An adapter should be screwed in the spark plug hole to attach an air hose to a compressed air unit. Unbolt the mounting nut or bolt, dismantle the rocker arm/fulcrum and take out the pushrod for the defected valve and while doing this, blow compressed air into the cylinder. In case of the nylon rope, you should place the piston around forty-five degrees before the TDC, and then you introduce the rope into the combustion chamber and then turn the crankshaft until some level of resistance is experienced. Coat steel shop rags and fit them over the oil return holes, then compress the valve spring with the help of a valve spring compressor and unscrew the keepers to set away the spring retainer together with the valve spring. Remove the old valve stem seal while checking that you have the spring shim in place before you replace the valve stem seal. Place the valve stem under tape or rubber band to add stability to the valve stem and check for any kind of damage on it. Applying pressure into the air to keep the valve closed before undoing the use of tape or rubber band. Coat the new valve stem seal with the grease and then fit the valve stem seal to it, then the valve spring and retainer must also be fitted. Reduce the assembly and fit the keepers flush with the surface. Remove the air hose and the adapter, then place back the rocker arm and the pushrod. Do the same for all the valve assemblies if replacing all seals and ensure that the piston is at the Top Dead Centre before releasing the valve keepers. Last of all put the spark plug(s) back and reconnect the wire(s) put back the valve cover and start the engine, to check for oil leaks or abnormal sounds.

Damaged valve springs and worn valve stem seals are, therefore, easily done without stripping the cylinder heads. One method involves using of a tool recommended by the manufacturer to remove valve springs and seals without camshafts removal while the other method involves the use of a readily available tool and involves removal of the camshafts. The two methods give the same outcome but using the manufacturer's approach is less straining if the right resources are in the manufacturer's procedure. For this operation, often a compressed air source is required, so be sure to collect the necessary equipment in advance. First, you have to pull out the valve cover and spark plug from the cylinder that you know is problematic; you have to rotate the crankshaft until the piston gets on the compression stroke. Air hose adapter should be screwed into the spark plug hole, and the compressed air should be used to retain the valves. Cotton should be placed in the cylinder head holes so that no parts fall in the engine. As with the method utilizing special tools, the usage of a valve spring spacer is mandatory, so that the valve seal received damage during compression. When the spring is compressed the rocker arm is taken off and this is followed by the keepers, spring retainer, the spring and the stem seal of the valve. If pressure cannot retain the valve closed any further fixes may be required. In the other procedure the camshaft is withdrawn and a clamp type valve spring compressor used in compressing the spring and the removal of the keepers, spring retainer and stem seal. What's more, to ensure that this valve can be installed successfully, a rubber band or tape should be tightly placed around the valve stem so that it will not fall, after that the air pressure should be applied so that the valve will be ensured to be closed. The top is lubricated, a new seal is put, and the garter spring has to be correctly placed on the valve stem. The valve spring retainer is then placed followed by the keepers placing them in the groove created. After release of pressure on the spring tool, the air hose is disconnected and the spark plug and ignition coil restored. Lastly, the procedures are the reverse of installation steps and starting of the engine and tighten the bolts while observing the car for oil stains and unusual sounds.

The intake valve seals are identified by the marking "IN".