Valve Guide Seal: Service and Repair

REMOVAL
1. Perform fuel system pressure release procedure before attempting any repairs.
2. Disconnect negative cable from remote jumper terminal.
3. Remove air cleaner housing cover and inlet hose.
4. Remove upper intake manifold.
5. Remove cylinder head cover(s).
6. Remove crankshaft damper, timing chain cover, and timing chain.
7. Remove camshafts.
8. With air hose attached to spark plug adapter installed in the cylinder being serviced, apply 620.5-689 kPa (90-100 psi) air pressure. This is to hold valves in place while servicing components.
9. Using Special Tool MD 998772A with adapter 6779, compress valve spring and remove valve locks, retainer, and valve spring.





Fig. 60

10. Remove valve stem seals by using a valve seal tool (Fig. 60).

INSTALLATION
1. 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 locks.
2. 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 on the cylinder that the valve spring is to be removed.
3. Remove spark plug adapter tool and Special Tool MD 998772A.
4. Install rocker arm(s).
5. Install camshafts, timing chain, and timing chain cover.
6. Install cylinder head covers.
7. Install upper intake manifold.
8. Connect negative cable.