Figure 3-50. Injector cup-removal/installation.

*TM 9-2815-213-34

sulphur content in fuel or overload operating conditions.

(3) Enlarged or distorted spray holes, caused by

cleaning with drills, wires, or other instruments.

(4) Plunger seat pattern covers less than 40 %

continuous area around cup, cone or plunger bore (fig. 3-

52).

Figure 3-51. Injector Link-removal/installation.

Figure 3-49. Fuel injector PT (type C)

Figure 3-52. Plunger seat pattern.

b. Injector Body.

(1) Inspect injector body plunger bore for

scoring, if scores are too deep, injector body

should be replaced.

(2) Use strong magnifying glass to check

for burs, carbon, and distorted radii in orifices.

When injector orifices are damaged, the injector

will not function properly.

c. Injector Plunger.

Figure 3-50. Injector cup-removal/installation.

(1) Check closely for metal seizure caused

CAUTION

by scuffing or scoring.

Never alter size of injector spray holes.

(2) Spots or surface disruption at top of

plunger or at mid-point, usually are normal re-

a. Injector Cup. Inspect injector cup spray

sults of rocker lever thrust action. Unless metal is

holes and tip with magnifying glass and compare

displaced or wear is measureable at these points,

with new cup. Discard cup if any of following

conditions exist:

(1) Interior/or exterior abrasive wear.

(2) Corrosion damage and effect of exces-

sive heat, usually resulting from high acid or

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