TM 10-4320-315-24
4-3.
MAINTENANCE OF FUEL INJECTORS - (Cont)
d.
TEST,
(1)
Connect fuel injector to injection test set.
WARNING
• Do not put hands under nozzle during test. Fuel under high pressure can cause severe injury.
• Diesel fuel is flammable. Keep sparks, cigarettes, and open flame away from fuel system
components while working on engine.
NOTE
Adding shims will increase nozzle opening pressure. Removing shims will decrease nozzle
pressure.
(2)
Pump injection test set until fuel sprays from tip of nozzle. Note reading on pressure gage. Gage
reading must be 2538-2654 psi (17497-18297 kPa).
(3)
Pump injection test set until fuel sprays from tip of nozzle. Check pattern of fuel spray. Fuel must
spray in a mist from jets. Presence of a solid stream indicates a faulty nozzle.
(4)
Pump injection test set until pressure gage reads 2102-2175 psi (14491-14994 kPa). Hold pressure for
30 seconds. If fuel leaks from nozzle tip, nozzle is faulty.
(5)
Bleed pressure from injection test set. Remove fuel injector.
4-4
