FUEL INJECTOR REPAIR (Contd)
Injector barrels and plungers are not interchangeable. To avoid equipment damage, do not
mix injector barrels and plungers.
Plunger (2), barrel (9), and
The use of an ultrasonic cleaner is
injector cup (10)
recommended for plunger, barrel,
and injector cup.
Compressed air used for cleaning purposes will not exceed 30 psi (207 kPa). Use only with
effective chip guarding and protective equipment such as goggles or shield, gloves, etc.
Failure to comply may result in injury to personnel.
All cleaned parts
Dry with compressed air.
Place all cleaned injector assembly
(1) part under cover to prevent
Handle injector plunger with care to prevent damage.
a. Scuffing or scoring.
Replace plunger (2) and barrel (9)
if scuffed or scored.
b. Bright spots at machined area
This is a normal condition.
bottom and mid-point.
c. Surface defects.
Replace if evident.
d. Cracks or looseness.
Replace if cracked or loose. Rotate
by hand to determine looseness.
Injector spring (6)
a. Excessive wear.
b. Spring compression.
Use suitable spring tester. Discard
if 138 lb (62.65 kg) or less at 1.663
in. (42.240 mm) spring height.
c. Spring squareness.
Use dial indicator. Rotate spring
and measure at top and bottom of
spring (6). Discard if 0.016 in.
(0.406 mm) is exceeded.
Injector cup (10)
Inspect spray holes and tip for:
Use magnifying glass. Compare to
a. Abrasive wear.
Internally and externally.
b. Corrosion and erosion.
If hole size has not changed,
c. Enlarged or distorted spray
Discard if holes are enlarged.