Cadillac 12565763 Spring, Valve

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Start and run the engine, checking for any oil leaks or unusual noises from the valve cover area.

For Valve Stem Oil Seal replacement, first remove the valve cover(s) from the cylinder head(s), and if replacing all seals, remove all spark plugs as well. Identify the cylinder with the defective component or start with cylinder number 1 when replacing all seals, following the firing order sequence (1-6-5-4-3-2) with each cylinder 120 degrees clockwise apart. Rotate the crankshaft to position the piston in the chosen cylinder at Top Dead Center on the compression stroke. Remove all rocker arms, pushrods, and support bars from the targeted cylinder head. Thread an adapter into the spark plug hole and connect it to a compressed air source, applying 90 to 100 psi of pressure to secure the valves in place. Prevent foreign objects from entering the engine by placing shop rags in the cylinder head holes. Utilize a valve spring compressor to compress the valve spring and retainer, allowing the removal of the keepers. Take out the spring retainer or rotator, as well as the valve spring assembly, and extract the old Valve Stem Oil Seal from the valve guide. To avoid valve dropping, secure the valve stem with a rubber band or tape, then release the air pressure. For installation, inspect the valve stem for damage and ensure it moves freely without binding in the guide. Reapply air pressure to keep the valve closed, then remove the tape or rubber band. Lubricate the valve stems with engine oil and install the new Valve Stem Oil Seals, tapping them gently into place using a seal installation tool or deep socket, taking care not to twist or cock the seals. Confirm the garter spring is properly positioned around the top of each seal. Proceed to install the valve spring and damper if equipped, with the closely-wound spring coils facing the cylinder head, and secure the valve spring retainer or rotator. Disconnect the air hose, remove the adapter from the spark plug hole, and repeat the process for the remaining cylinders, aligning each piston with TDC on the compression stroke. Finally, reinstall the rocker arms, support bars, and pushrods, followed by the valve cover(s), spark plug(s), and wires, and start and run the engine, checking for any oil leaks or unusual noises from the valve cover area.

A valve-spring compressor should be used.

Install the spring and retainer, compress the valve spring assembly, and position the keepers in the valve stem groove.