ROCKER ARM ASSEMBLY AND COVER REPLACEMENT
Do not remove the last four screws (primary fasteners) until valve
spring pressure has been relieved. Valve spring pressure must be
relieved at each cylinder as the rocker arm cover for that cylinder is
Failure to comply may damage cylinder threads that retain
rocker arm cover.
8. Release valve spring (22) tension.
a. Release the tension on valve rocker arms (23) and valve springs (22) by rotating engine
crankshaft until rocker arm rollers (24) are on camshaft base circle (valves are closed).
b. Check rocker arms (23) for free movement between adjusting screw pads (25) and valve
stems (26) on both exhaust and intake valves. If movement (clearance) cannot be felt,
rotate engine crankshaft until clearance is evident.
c. When clearance is obtained between adjusting screw pads (25) and valve stems (26),
rocker arm rollers (24) are on camshaft base circle, and valve spring tension is relieved.
WP 0104 00-8