Lincoln F1CZ-6571-A Valve Stem Seal

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.