TM 9-6115-604-34
NAVFAC P-8-633-34
SECTION IV. MAINTENANCE OF FUEL INJECTORS
6-12. GENERAL
a.
This section contains disassembly, cleaning, inspection, repair, replacement, reassembly, test, and adjustment
instructions for the fuel injectors.
b.
Because of the precision fit and finish of the related components, it is essential to avoid contamination by
airborne dust or other contaminants.
c.
The work area should be located as far as possible from grinding, painting, or other activities that could be a
source of airborne contaminants. An enclosed, fuel systems service room is preferred.
d.
The workbench, tools, and equipment must be kept dean and free of oil, grease, or other contaminants.
e.
To ensure thorough cleaning, the fuel injectors must be completely disassembled during overhaul.
f.
Place small parts together in trays to prevent loss.
g.
Remove all traces of corrosion-preventive compound from new parts before installation in the assembly.
h.
Ultrasonically dean all parts thoroughly before inspection and assembly.
i.
This section is arranged on the assumption that a known defective injector is to be repaired, tested, and adjusted
in that order. The paragraphs may be performed in any other order, but, any injector disassembled must be
bench tested and adjusted after reassembly. Also, any injector received as a service replacement must be
adjusted before installation in the cylinder head. An injector leakage tester 3375375 (Figure 6-18), injector cup
spray tester 3376350 (Figure 6-19), and injector test stand 3375410 (Figure 6-20) are required to perform injector
maintenance.
6-13. FUEL INJECTOR REMOVAL
NOTE
It is not necessary to remove push rods (1 and 2, Figure 9-13) from the cylinder head in order
to remove the fuel injectors. I the push rods are removed at this time, it will be necessary to
matchmark them in accordance with paragraph 9-6 in order to ensure that they will be
correctly installed during reassembly.
a.
Remove the rocker arm cover (6, Figure 9-2), rocker arms (12, 13, and 14), and shaft (11) assembly, and the
valve crossheads (8, Figure 9-1) from the cylinder head in accordance with paragraph 9-5.
NOTE
Do not remove the plunger (3, Figure 6-21) and spring (4) from the fuel injector at this time.
Removing the plunger (3) and spring (4) may result in dirt entering the barrel (15) and cup (16).
b.
Match-mark the injector plunger link (2, Figure 6-21) and fuel injector. Remove the injector plunger link.
c.
Remove the capscrews (19) and remove the damp (18) from the cylinder head.
d.
Using injector puller 3376000, pull the fuel injector from the cylinder head.
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