19
FUEL SYSTEM
The injector push rod is operated from the rocker and cam assembly by a sprocket. The push rod is located in the
housing bore and retained in its extended position by a push rod return spring. The powerful spring ensures that
the push rod socket is always in contact with the rocking lever and the cam.
The lower part of the injector housing locates the spring loaded nozzle. The nozzle is retained in the housing by a
nozzle cap nut which is screwed onto the housing. The nozzle cap nut has four holes around its circumference
which connect to the fuel pump drilling in the cylinder head. The injector housing has ports located above the
nozzle cap nut which connect with the fuel delivery drilling in the cylinder head. An ’O’ ring seals the injector in the
machined location in the cylinder head and a copper washer seals the injector from the combustion chamber.
The injectors are supplied with pressurised fuel from the fuel pump via the pressure regulator housing and internal
drillings in the cylinder head. Each injector sprays fuel directly into the cylinder at approximately 1500 bar (22000
lbf.in) atomising the fuel and mixing it with intake air prior to combustion.
The camshaft and rocker arrangement depresses the push rod which pressurises the fuel within the injector.
When the injector is required to inject fuel into the cylinder, the ECM energises the solenoid which closes a valve
within the solenoid housing. The closure of the valve stops the fuel entering the return line to the pump, trapping it
in the injector. The compression of the fuel by the push rod causes rapid pressurisation of the fuel which lifts the
injector nozzle, forcing the fuel into the cylinder at high pressure. The ECM controls the injection timing by altering
the time at which the solenoid is energised and the injection period by controlling the period for which the solenoid
is energised.
8
DESCRIPTION AND OPERATION
| Categories | Land Rover, Land Rover Defender |
|---|---|
| Tags | Land Rover |
| Model Year | 1999, 2000, 2001, 2002 |
| Download File |
|
| Document Type | Workshop Manual |
| Language | English |
| Product Name | Defender |
| Product Brand | Land Rover |
| Document File Type | |
| Publisher | landrover.com |
| Wikipedia's Page | http://en.wikipedia.org/wiki/Land_Rover |
| Copyright | Attribution Non-commercial |
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