TM 5-4310-379-14
(u)
Inspect both ends of spill deflector (18) for sharp edges or burrs. Remove burrs with 500 grit stone.
(v)
Inspect spring (4) for visual defects and replace if cracked or otherwise damaged.
NOTE
It is recommended that at repair both injectors be converted over to current spring configuration
having a wire diameter of .142 in. (.360 cm).
(w)
Test spring (4) using spring tester. Replace spring (4) that compresses to 1.028 in. (2.611 cm) or
less when a load of 70 lbs (154 kg) is applied. The spring (4) has a free length of approximately
1.504 in. (3.820 cm) and a diameter of .142 in. (.360 cm).
(x)
Check the seal ring area on injector body (20) for burrs or scratches and remove minor defects with
500 grit stone.
(y)
Inspect contact area between injector body (20) and bushing (19). Lap area on body (20) to remove
minor surface imperfections.
(z)
Inspect injector plunger (7) and bushing (19) for scoring, erosion, chipping or wear. Check for sharp
edges on the plunger (7) where it contacts the gear (22), and remove any sharp edges with 500 grit
stone. Check port holes in the diameter of bushing (19) for cracks or chipping. Insert plunger (7)
into bushing (19) and check for free movement. If any damage is present on either the plunger (7) or
bushing (19), both pieces must be replaced since they are a matched set.
NOTE
The sealing surface of current spray tips is precision lapped by a new process which leaves the
surface with a dull satin-like finish; the lapped surface on former tips was bright and shiny. It is
not recommended to lap the surface of the current spray tip.
(aa)
Inspect the sealing surfaces of bushing (19), check valve (16), check valve cage (15), spring cage
(12) and spray tip (10) with a magnifying glass. Check for inspections, burrs, nicks, erosion, cracks,
chipping, and excessive wear. Minor imperfections on spray tip (10), check valve cage (15), check
valve (16) and valve spring cage (15) can be removed by lapping. The minimum thickness of parts
is as follows:
Spray Tip (Shoulder)
.199 in. (.505 cm)
Check Valve Cage
.163-.165 in. (.414-.419 cm)
Check Valve
.022 in. (.055 cm)
Valve Spring Cage
.602 in. (1.529 cm)
Replace any item that is worn or otherwise damaged.
(ab)
Inspect seating area and needle quill of needle valve (11) for wear or damage and replace if worn or
damaged.
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