ARMY TM 9-2815-255-24
AIR FORCE TO 38G1-95-2
MARINE CORPS TM 2815-24/4
Inspect rocker arm shaft for severe scratching, scoring, or excessive wear at points of rocker arm contact. Wear
could indicate weak valve springs, bent pushrods, or loose rocker arm shaft clamps.
Roll rocker arm shaft on a flat surface to check for bends or distortion. Replace shaft as necessary.
Measure rocker arm shaft OD at each rocker arm location. New rocker arm shaft OD is 0.787 to 0.788 inch
(19.99 to 20.02 mm). If rocker arm shaft OD is smaller than 0.785 inch (19.94 mm), install a new shaft.
Inspect and measure each rocker arm shaft support ID. If ID is more than 0.794 inch (20.17 mm), install a new
Inspect and measure rocker arm ID. New rocker arm ID is 0.790 to 0.792 inch (20.07 to 20.12 mm). If rocker
arm ID is over 0.794 inch (20.17 mm), install a new rocker arm.
Check rocker arm adjusting screw for damage. Visually inspect rocker arm for hairline cracks. Replace if
Check for cups or concave wear on ends of rocker arms where they contact valve tips. If wear exists, replace
Cleaning solvent Is flammable and toxic to eyes, skin, and respiratory tract. Skin/eye protection
required. Avoid repeated/prolonged contact. Good general ventilation is normally adequate.
Compressed air used for cleaning can create airborne particles that may enter the eyes. Pressure
will not exceed 30 psig (207 kPa). Eye protection required.
Thoroughly clean all rocker arm assembly components with dry cleaning solvent (P-D-680). Dry with
Clean pushrods with dry cleaning solvent (P-D-680) and compressed air.
Check pushrods for straightness by rolling on a flat surface.
Inspect pushrods for wear, damage, or any physical distortion.
Replace defective pushrods that do not pass inspection.
Lubricate OD of shaft (7, FIGURE 3-98), bores of rocker arms (8), and supports (3) with clean engine lubricating
Make sure during assembly that main oil supply hole on rocker arm shaft (7) faces flywheel end,
to avoid engine damage.
Slide spring (9), rocker arms (8), and rocker arm supports (3) onto shaft (7). Assemble in same order as they
were before disassembly.