Chevrolet 91171890 Spring,Valve Rocker Arm

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To replace broken valve springs or defective Valve Stem Oil Seals without the need to remove the cylinder head, specialized tools and compressed air are typically employed for this procedure. Firstly, remove the rocker arms and shafts from the cylinder head and the spark plug from the affected cylinder. Position the piston of the problematic cylinder at top dead center on the compression stroke, starting with cylinder number one if replacing all Valve Stem Oil Seals and following the firing order. Thread an adapter into the spark plug hole and connect it to a compressed air source, ensuring safety precautions. Alternatively, if compressed air isn't available, place the piston near TDC on the compression stroke and insert a length of nylon rope into the spark plug hole to secure the valves. Next, prevent any components or tools from falling into the engine and utilize a valve spring compressor to compress the spring, allowing for the removal of keepers. Remove the spring retainer, valve spring, and guide seal, taking note of potential valve face or seat damage. Wrap the valve stem, release the air pressure or rotate the crankshaft accordingly, and inspect the valve stem for damage. Reapply air pressure, remove any obstructions, lubricate the valve stem, and install a new guide seal. Complete the installation by reinstalling the valve spring, retainer, and keepers, ensuring their proper seating, and then proceed to reconnect the air hose or remove the rope. Finally, reinstall the rocker arms and shafts, spark plug(s), and camshaft cover, and perform necessary engine checks for leaks and unusual sounds in the rocker arm cover area after starting the engine.