21-22-12 5.8L (351 CID) M-V-B and 6.6L (400 CID) V-8 Engines 21-22-12 FULCHUM BOLT GAGZQ CI L DEF LECTOR FULCRUM SEAT eAsza ROCKER ARM 7 6564 AS23643 FIG. 13 Rocker Arm and Related Parts I. Apply Lubriplate or equivalent to the top of the valve stem. Lubricate the rocker arm and fulcrum seat with heavy engine oil SE. Position the No. I piston on TDC at the end of the compression stroke POSITION I in Fig. 4, and install the rocker arm, fulcrum seat, on deflector, and fulcrum bolts on the following valves: No. i Intake No. i Exhaust No. 4 Intake No. 3 Exhaust No. 8 Intake No. 7 Exhaust Position the crankshaft in POSITION 2 Fig. 4 and install the rocker arm, fulcrum seat, oil deflector and fulcrum bolts on the following valves: No. 3 Intake No. 2 Exhaust No. 7 Intake No. 6 Exhaust Position the crankshaft in POSITION 3 in Fig. 4 and install the rocker arm, fulcrum seat, oil deflector and fulcrum bolts on the following valves: No. 2 Intake No. 4 Exhaust No. 5 Intake No. 5 Exhaust No. 6 Intake No. 8 Exhaust Be sure that the fulcrum seat base is seated in its slot on the cylinder head before tightening the fulcrum bolts. Tighten the fulcrum bolt to specification. Check the valve clearance following the procedures under Valve Clearance Adiustment. Clean the valve rocker arm cover(s) and the cylinder head gasket surface(s). Apply oil-resistant sealer to one side of new cover gas et(s). Lay the cemented side of the gasket(s) in place in the cover(s). Position the cover(s) an the cylinder head(s). Make sure the gasket seats evenly all around the head. Install the bolts. The cover is tightened in two steps. Tighten the bolts to specification. Two minutes later, tighten the bolts to the same specification. Reconnect the crankcase ventilation hose(s) (Fig. 12). Install the air cleaner and intake duct assembly. Install the spark plug wires in the bracket on the valve rocker arm coverls). Connect the spark plug wires. Start the engine and check for leaks. VALVE SPRING, RETAINER AND STEM SEAL Broken valve springs or damaged valve stem seals and retainers may be replaced without removing the cylinder head, provided damage to the valve or valve seat has not occurred. Removal 1. 2. Remove the required rocker arm(s) following the instructions given in Rocker Arm Removal. Remove the applicable spark plug, Crank the engine until the piston is at TDC at the end of the compression stroke. Install an air line with an adapter in the spark plug hole and turn on the air supply (Fig. 14). Install the compressor tool as shown in Fig. 14. Compress the valve spring and remove the retainer locks, spring retainer and valve spring (Fig. 48). T70P-6049-A FIG. 14 Compressing Valve Spring in Chassis Remove and discard the valve stem seal (Fig. 15). If air pressure has forced the piston to the bottom of the cylinder, any removal of air pressure will allow the valve(s) to fall into the cylinder. A rubber band, tape or string wrapped around the end of the valve stem will prevent this condition and will still allow enough travel to check the valve for binds.