Removal

REMOVAL - CYLINDER HEAD ON
1. Perform fuel system pressure release procedure before attempting any repairs.
2. Disconnect negative cable from battery.
3. Remove air cleaner housing and hose assembly.
4. Remove upper intake manifold.
5. Remove cylinder head covers.
6. Remove rocker arm and shaft assembly.
7. Remove spark plugs.
8. Rotate the crankshaft clockwise, until the number 1 piston is at TDC (Top Dead Center) on the compression stroke.
9. With air hose attached to spark plug adapter installed in number 1 spark plug hole, apply 620.5 to 689 kPa (90 to 100 psi) air pressure. This is to hold valves into place while servicing components.
10. Using Tool MD 998772A with adapter 6527 or equivalent, compress valve spring and remove valve locks, retainer, and valve spring.
11. Remove valve stem seal, if required.
12. Follow the same procedure on the remaining 5 cylinders using the firing sequence 1-2-3-4-5-6. Make sure piston is at TDC in each cylinder of the valve spring that is being removed.
13. Remove spark plug adapter tool.