Lincoln E6TZ-6571-A Seal - Valve Stem

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If the broken valve spring or defective valve stem seals are to be replaced without removing the cylinder heads, there are two methods that can be used. In both methods of repair, compressed air is usually required but if it is not obtainable, a length of nylon rope serves as a tool to keep valves from falling into the cylinder during operation. After removing the valve cover and positioning the cylinders at TDC, compressed air or rope is utilized to maintain the valve position. In this case, special tools compress the spring by using air hence allowing for the removal of the camshaft roller follower, keepers, spring retainer, and valve spring respectively. Valve stem seals are then fitted while components are reinstalled in reverse order. Alternatively, the camshaft and roller follower may be removed using a locally available valve spring compressor after which removal/installation follows a similar sequence.

To replace broken valve springs or defective valve stem seals without removing the cylinder heads, specific tools and compressed air are needed. Remove valve cover(s) and spark plug(s) from affected cylinder. Ensure piston is at Top Dead Center on compression stroke. Thread adapter into spark plug hole and connect air hose from compressed air source. If no air pressure, insert nylon rope into combustion chamber to prevent valve drop. Remove rocker arm, fulcrum, and pushrod for affected valve. Apply compressed air to hold valves in place. Alternatively, with rope, stuff rags into cylinder head holes, use valve spring compressor to compress spring, remove keepers, and disassemble valve components. Inspect valve stem for damage, lubricate it, and install new valve guide seal. Reassemble valve components, release air pressure or rotate crankshaft, and reinstall rocker arm(s), pushrod(s), spark plug(s), and valve cover(s). Start and run engine, check for oil leaks and unusual sounds from valve cover area.

If the broken valve spring or defective valve stem seals are to be replaced without removing the cylinder heads, there are two methods that can be used. In both methods of repair, compressed air is usually required but if it is not obtainable, a length of nylon rope serves as a tool to keep valves from falling into the cylinder during operation. After removing the valve cover and positioning the cylinders at TDC, compressed air or rope is utilized to maintain the valve position. In this case, special tools compress the spring by using air hence allowing for the removal of the camshaft roller follower, keepers, spring retainer, and valve spring respectively. Valve stem seals are then fitted while components are reinstalled in reverse order. Alternatively, the camshaft and roller follower may be removed using a locally available valve spring compressor after which removal/installation follows a similar sequence.

Turn the crankshaft until the piston in the affected cylinder is at top dead center (TDC) on the compression stroke. If replacing all valve stem seals, begin with cylinder number one and work on the valves for one cylinder at a time, following the firing order sequence.

Broken valve springs and defective valve stem seals can be replaced without removing the cylinder head.

Thread an adapter into the spark plug hole and connect an air hose from a compressed air source to it. Most auto parts stores can supply the air hose adapter.

Position the piston at approximately 45-degrees before TDC on the compression stroke, then feed a long piece of nylon rope through the spark plug hole until it fills the combustion chamber.

Two special tools and a compressed air source are normally required. If compressed air isn't available, a length of nylon rope can be used.

The rocker arm, fulcrum, and pushrod for the affected valve should be removed.

Install the spark plug(s) and connect the wire(s).

Stuff shop rags into the cylinder head holes above and below the valves.

Disconnect the air hose and remove the adapter from the spark plug hole. If a rope was used, pull it out of the cylinder. Install the rocker arm(s) and pushrod(s), install the spark plug(s) and hook up the wire(s), and install the valve cover(s).

If air pressure fails to hold the valve in the closed position, the valve face or seat is probably damaged, and the cylinder head will have to be removed for additional repair operations.

Install the spring in position over the valve, then install the valve spring retainer.

The valves should be held in place by the air pressure.