spray pattern. If fuel is being discharged
evenly through all four holes in the nozzle
tip at the specified popping pressure, the
spray pattern is considered satisfactory. If
fuel is not being discharged evenly from
all four holes in the nozzle tip, a plugged
hole or holes is indicated; then the nozzle
must be removed and cleaned, using a
e. Fuel Injection Nozzle Holder Cleaning and
(1) Before starting the disassembly of a fuel
injection nozzle holder, it is of the utmost
importance to have a clean work bench,
Figure 45. Nozzle spray patterns.
Figure 46. Cleaning nozzle orifices.
fluid containers, clean tools, and clean
Cleanliness is emphasized
because injection nozzle service troubles
are, in most instances, due to dirt entering
the nozzles. Use clean paper on the work
bench and as the nozzle holder is
disassembled, place the components in a
container of clean diesel fuel as a
protection against dirt and corrosion.
Figure 44. Adjusting popping pressure.