Mercury F1CZ-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.

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.

Valve spring failure and valve stem seal failure can be remedied without removing the cylinder head that normally needs two special tools and a compressed air supply. If compressed air is not attainable, it is possible to employ a string of nylon to avoid the valves from falling into the cylinder. Start by extracting the spark plug of the cylinder which is having the bad component and in case you are replacing all valve stem seals, extract all spark plugs. To do this, rotate the crankshaft until the piston in the troubled cylinder is at the position of top dead centre in the compression stroke and this sequence commences with cylinder number one and then follows the firing sequence. Insert a spark plug and attach an air hose adapter to it and then tape it to a canister of compressed air. When this is done, take out the nut, fulcrum, and rocker arm of the defective valve before blowing compressed air to the cylinder but a note of warning due to crankshaft oscillation. The air pressure expects to retain the valves tightly on the valve seats; therefore, if there are leaks, the condition of the valves may be poor. If compressed air is not available the piston should be placed about 45 degrees before TDC, and the combustion chamber filled with nylon rope, leaving one end protruding for easy extraction. Take shop rags by wiping off the debris so that it cannot find its way into the engine after that compress the valve spring with the help of what is called a valve spring compressor and then remove the keepers. Following the removal of the spring retainer, shield and valve spring, take out the umbrella type guide seal. The valve may be damaged in such a way that air pressure cannot hold the valve closed, then this may call for cylinder head removal. Place a rubber band or tape around the valve stem to keep it from going down, then look for sign of tear, wear and check for free movement in with the guide. To retain the valve in the closed position, apply air pressure, lubricate the valve stem with engine oil, replace with a new guide seal. Put the spring and the shield on the valve, screw in the spring retainer, compress the spring, and put the keepers in place; use a small amount of grease to fix them in place. Take off the pressure at the spring tool making sure the keepers are in place, then disconnect the air hose and remove the adapter from the spark plug hole. Last, replace the spark plug(s), re-connect the wire(s), and start the engine, expend a few minutes look for any signs of oil leaks or unusual noise from the valve cover area.

Start and run the engine, then check for oil leaks and unusual sounds coming from the valve cover area.

Start and run the engine, then check for oil leaks and unusual sounds coming from the rocker arm cover area.

The valve stem should be inspected for damage, lubricated, and a new valve guide seal should be installed.

Lubricate the valve stem with engine oil and install a new seal.

Wrap a rubber band or tape around the top of the valve stem, then release the air pressure.

Critical inspections and precautions include checking for valve face or seat damage, inspecting the valve stem, installing a new seal, reassembling the components, and checking for leaks or unusual sounds after engine startup.

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.

If air pressure isn't available, a nylon rope can be inserted into the combustion chamber to prevent valve drop.