Injection Nozzle - Isuzu NHR 4J Series Workshop Manual

6C - 6 ENGINE FUEL

INJECTION NOZZLE

For 4J Series diesel engines, there are two types
available: Direct injection engine (4JB1/4JB1T) and
Indirect injection engine (4JG2). Accordingly, the
injection nozzles to be used are different depending on
the type of the engine and the combustion chamber.
The injection nozzle sprays pressurized fuel from the
injection pump into the combustion chamber through
the injection nozzle orifices.
4JB1 engines employ a hole type nozzle with four
injection orifices. The nozzle is made up of the nozzle
body and the needle valve assembly.
Pressurized fuel from the injection pump is sprayed by
the injection nozzle into the combustion chamber
through the nozzle body orifices.
4JB1-TC Engine
The two-spring nozzle holder has been developed to
reduce NOx (Nitrogen Oxides) and particulates from
direct injection diesel engine exhaust.
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