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A. Injection Nozzle Removal
(1) Disconnect the fuel line from the injection nozzle (Figure 10).
(2) Remove the injection nozzle from the engine cylinder.
B. Injection Nozzle Cleaning
CAUTION
Complete the "Injection Nozzle Cleaning" procedure in Chapter 5-30.
NOTICE: Injection nozzles are not repairable.
C. Injection Nozzle Installation
(1) (Optional) Complete the "Injection Nozzle Fuel Flow Check" in this chapter.
(2) Lightly lubricate the injection nozzle threads with engine oil mixture.
(3) Install the injection nozzle (Figure 10) on the engine cylinder.
(4) Torque the injection nozzle to 60 in.-lb. (7 Nm). Continue to torque the injection nozzle
until the letter or number stamped on the nozzle points downward.
(5) Connect the fuel line to the injection nozzle.
(6) During the "Operational Ground Check" in Chapter 72-00 (which is to be done after all
maintenance is complete), look for fuel leaks at the fuel lines and connections during
engine operation. Identify and correct the cause of any fuel leak. There must not be any
fuel leaks when the engine is returned to service.
73-10
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Injection Nozzle
NEVER USE A SHARP TOOL SUCH AS A WIRE OR PIN TO CLEAN
OUT AN INJECTION NOZZLE. DAMAGE TO THE INLET AND
OUTLET FUEL RESTRICTORS COULD OCCUR WHICH WOULD
CHANGE THE FUEL FLOW.
IO-390-D Series Engine Maintenance Manual
IO-390-D Series Engine Maintenance Manual
Figure 10
© 2020 Avco Corporation. All Rights Reserved
March 2020
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