ARMY TM 9-2815-255-24
AIR FORCE TO 38G1-95-2
MARINE CORPS TM 2815-24/4
Do not touch machine finished surfaces. Damage due to corrosion could occur.
If damage or excessive wear is apparent, head and rotor must be replaced as a matched set.
Final check for excessive wear on rotor should be performed on test stand by checking for
minimum cranking delivery.
Examine radii contacted by leaf spring and tang slot for excessive wear. Check all slots and charging and discharge
ports for chipping of edges or dirt, and rotor shank for major scratches. Slight erosion on edge of discharge port is
3-27.4.5 Delivery Valve.
Inspect delivery valve retraction cuff for chipping or erosion of edges.
Do not force plungers into their bore and do not handle precision parts of rotor.
While holding rotor under clean oil, insert plungers into their bores facing same direction as they were removed. With
thumb and forefinger over shoe slots, tilt rotor from side to side several times to determine complete freedom of
movement. If new plungers are being installed, interchanging their positions may be necessary as rotor and plungers
become matched parts. If plungers are sticking, but not visibly damaged, clean both plungers and bore with a soft brush
and dry cleaning solvent (P680).
3-27.4.7 Cam Rollers and Shoes.
Never attempt to press a roller into a shoe from outer edges, as groove width at this point Is less
than roller outside diameter and shoe breakage may result.
Check each roller in its shoe for freedom of movement. Inspect top edge of each shoe, where retained by leaf spring, for
chipping or excessive wear. Inspect roller and shoe for abrasive wear patterns.
3-27.4.8 Leaf Spring and Screw.
To prevent possible Improper positioning of parts and unnecessarily disturbing leaf spring
adjustment, do not remove screws (25, FIGURE 3-52) and leaf springs (26) unless they are being
replaced or a new rotor and head assembly Is being Installed.
If damaged, remove screws (25, FIGURE 3-52) and leaf springs (26).
Check for excessive wear at points where spring contacts radii on rotor and along steps that retain roller shoes.
Check adjusting screw for tightness in rotor.