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TM 5-4320-305-24
4-4. REPAIR INJECTION PUMP (Continued)
a. Measure and record height of screw (147) above
tappet (148).
b. Loosen nut (149), and remove screw (147) and nut.
Remove guide pin (150).
c. Press stud (151) from bushing (152) and tappet (148).
Remove bushing from roller (153).
d. Inspect screw (147) for thread damage and for worn or
crushed end. Replace if damaged.
e. Inspect tappet (148) for pressure marks or scoring.
Remove light marks and scoring using crocus cloth.
f. Inspect stud (151) for grooving. Replace if grooved or
bent.
g. Inspect nut (149), guide pin (150), bushing (152), and
roller (153) for heavy wear. Replace damaged parts.
h. Press bushing (152) into roller (153), and position roller in tappet (148).
i. Press stud (151) through tappet (148) and into bushing (152).
j. Install guide pin (150), nut (149), and screw (147). Turn screw to height above tappet body as recorded in step a
above.
k. Tighten nut (149) to secure screw (147).
3 Inspect camshaft (82) for cracks or distortion. Inspect
threads for damage. Inspect cam lobes for chipping,
scoring, grooving, or cracks. If damaged, replace
camshaft.
4 Inspect bearing cups (80 and 84) and bearing cones
(86 and 89) for flat areas, pitting, cracks, or chipping.
Inspect bearing cones for cracked races. Replace
mating bearing cups and bearing cones as a pair if
either is damaged.
4-16
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