2-37. FUEL INJECTION NOZZLE REPAIR
This task covers:
General Safety Instructions
General mechanics tool kit:
l Do not place hands or arms near nozzle during
automotive (Appendix E, Item 1)
l Compressed air for cleaning purposes will not
exceed 30 psi (207 kPa).
Nozzle tester (Appendix E, Item 31)
l Wear eyeshields when using compressed air.
Engine disassembled into subassemblies
Clean fuel injection nozzle (2) in accordance with para. 2-9.
For general inspection instructions, refer to para. 2-10.
1. Inspect fuel injection nozzle (2) for thread damage. Replace if damaged.
2. Inspect fuel injection nozzle return nipples (1) for damage. Replace fuel injection nozzle (2)
3. Inspect fuel injection nozzle (2) for cracks and evidence of heat damage. Replace if cracked
(a) Connect fuel injection nozzle (2) to tester.
(b) Connect lines to return line nipples (1).
Do not place hands or arms near nozzle during testing.
Penetrating force of oil may cause serious injury or death.
(c) Close shutoff valve to pressure gauge on tester.
(d) Operate tester to prime nozzle (2).
2. Obtaining pressure check.
(a) Open shutoff valve to pressure gauge 1/4 turn.
(b) Depress lever on tester slowly. Note at what pressure the needle on pressure gauge stops.
Opening pressure must be between 1,500 psi (10,343 kPa) and 1,960 psi (13,514 kPa). Replace
nozzle (2) if opening pressure does not meet specifications.