Valve Guide Seal: Service and Repair

1. Perform fuel system pressure release procedure before attempting any repairs. Refer to Powertrain Management for procedure.
2. Disconnect negative battery cable.
3. Remove air cleaner housing and hose assembly.
4. Remove upper intake manifold.
5. Remove cylinder head covers and spark plugs.
6. Remove rocker arm and shaft assembly.
7. Rotate the crankshaft clockwise, until the number 1 piston is at TDC (Top Dead Center) on the compression stroke.
8. 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.
9. Using Tool MD 998772A with adapter 6527 or equivalent, compress valve spring and remove valve locks, retainer, and valve spring.





Fig. 85

10. Remove valve stem seals by using a valve stem seal tool (Fig. 85).
11. The valve stem seal/valve spring seat should be pushed firmly and squarely over the valve guide using the valve stem as guide. Do Not Force seal against top of guide. When installing the valve retainer locks, compress the spring only enough to install the locks.





Fig. 86

CAUTION: Do not remove garter spring around the seal at the top of the valve stem seal (Fig. 86).

12. Follow the same procedure on the remaining 5 cylinders using the firing sequence 1-2-3-4-5-6. Make sure piston in cylinder is at TDC on the valve spring that is being covered.
13. Remove spark plug adapter tool.
14. Remove Special Tool MD 998772A and install rocker arm and shaft assembly.
15. Install cylinder head covers. Refer to Valve Cover, Service and Repair.
16. Install ignition coils and connect all electrical connectors.
17. Install upper intake manifold.
18. Connect negative cable.