Fuel Injector Nozzle - Kohler 4EOZ Service

5.4 Fuel Injector Nozzle

The fuel injector nozzle ejects and atomizes the fuel in
the cylinder under high pressure. As it is located in the
combustion chamber, it operates at high temperatures
and strong mechanical stress. Clean and adjust the
injector as described below.
Injector Cleaning
1. Use a brass wire brush to remove residual
combustion products on the nozzle's surface.
2. A special tool/needle is required to clean the
injector nozzle's spray hole. Consult the engine
service manual for more information.
Figure 5-5 Injector
TP-6137 5/03
Injector Pressure Test
WARNING
Explosive fuel vapors.
Can cause severe injury or death.
Use extreme care when handling,
storing, and using fuels.
1. Connect the injector to a tester to check the
injection pressure value. See Figure 5-6.
2. Using the hand pump lever of the tester, pump fuel
in the injector until it ejects at the specified
pressure.
3. During this operation, the ejected fuel must be
evenly atomized without leakage or dripping.
Figure 5-6 Tester
Section 5 Fuel System 21