Once removed, the valve is taken out and can be properly replaced after first removing the cylinder heads. To start, remove the
Rocker Arms and
Lash Adjusters and then the
Camshaft bearing caps and the camshaft. Though the process is used for all six valve springs and valves, one valve and valve spring will be highlighted in the demonstration. Apply compressor tool C-3422-B or C-3422-C and the 8519 adapter on the valve spring and gently strike down on the valve spring to remove the locks from around the retainer. Remember to release the valve spring compressor slowly, watching as you carefully remove the two spring retainer lock halves. In the next step, uninstall the valve spring compressor and remove the spring retainer and spring. Look for rough spots on the edges of the keeper grooves and take out any burrs from the valve's stem before taking the valve out of the cylinder head. Because intake and exhaust
Valve Stem Seals are the same, simply prior to installing the valve, preparing by removing the seal and marking it. Whenever the valves are out, it's a good idea to inspect and test the valve springs before reusing them. See if any of the valve springs are worn out or damaged and align Tool C-647 40.12 mm from the threaded stud and with the zero mark at the front to check their strength. Atop the stud, put in the spring, set the tone using the lever and keep turning the torque wrench until you hear a ping, checking the reading then. If you read this value two times, it will give you the spring load at test length, allowing you to improve the measurement with help from the table's fractional readings. Look for the Specifications value to check expected height and maximum tension; discard any spring that is not 100% compatible.