Land Rover Lesson 2 Auto Trans Coolingine Rover Manual

Component Locations
High-pressure (HP) fuel rail (2 of)1
HP pipe - Fuel rail to injector (6 of)2
Injectors (6 of)3
Low Pressure (LP) pipe - Fuel return4
HP pipe - High Pressure Pump (HPP) to fuel
diverter rail
5
LP pipe - Injector leak-back6
Connector to injector (part of 6)7
HPP8
HPP pulley9
HP diverter rail10
Rear Engine Accessory Drive (READ) belt
tensioner
11
LH exhaust camshaft pulley12
GENERAL
The TdV6 is equipped with a High-Pressure (HP)
common rail fuel injection system. With this fuel
injection...

The common rail fuel injection system has the following
features:
•High fuel injection pressures of up to 1650 bar for
greater atomisation of fuel (increasing performance
and lowering emissions)
•Variable injection to optimise combustion in all
engine operating conditions
•Low tolerances and high precision throughout the
life of the system
The fuel system is divided into 2 sub systems:
•Low-Pressure (LP) system
•HP system.
The LP system features the following components:
•In-tank fuel pump
•Fuel pressure...

HP SYSTEM
HPP
The HPP is a three-piston (120 degree apart) radial
plunger pump with a HP displacement of 0.8 cc. As
mentioned, it has the ability to produce a maximum
pressure of 1650 bar. The housing is cast from iron, the
flange is cast from aluminium.
The pump is driven from the camshaft via a toothed
belt. It does not need to be timed to the engine during
belt replacement in service.
The required supply pressure to the HPP is -0.3 bar to
+0.5 bar gauge. The return pressure is -0.3 bar to +0.8
bar...

The pump is sized to deliver sufficient fuel to the HP
rails for all engine-operating conditions.
The HPP consists of the following components:
•Internal Transfer Pump (ITP)
•Volume Control Valve (VCV)
•HP pumping elements (3 of)
•Pressure Control Valve (PCV)
The ITP is a 5 vane pump. This conveys fuel to the
VCV.
The VCV is a variable position solenoid valve
electronically controlled by the ECM. The VCV is
located between the ITP and the HP pumping elements.
The VCV determines the amount of fuel that is...

LP fuel supplyA
Fuel supply to the HP pumping elementsB
HP outlet connection to the HP diverter railC
LP fuel return (spill)D
LP side of ITP1
ITP pressure relief valve2
Fuel Charging and ControlsLesson 2 – Powertrain
151Technical Training (G421108) 

Screen filter3
VCV4
ITP5
Edge filter (to protect PCV)6
PCV7
N/A8
Eccentric on HPP drive shaft9
Pumping element inlet valve10
Pumping element outlet valve11
HP ring line12
HPP elements (3 of)13
Lubricating valve14
The fuel induced by the ITP (5) is conveyed to the VCV
(4) and the lubricating valve (14).
When the VCV is closed, the ITP pressure relief valve
(2), lying parallel to the transfer pump, opens and
conveys the fuel back to the LP side (1) of the transfer
pump.
The fuel passes through the...

The HPP can supply up to 1600 bar fuel pressure
continuously with short excursions to 1650 bar. Pump
speed is 5/6 engine speed. However it is calibrated to
deliver fuel pressure dependant upon engine speed and
load and is always under full control.
When the HPP is rotated, pressure is created when the
VCV is open and the PCV is closed. The VCV and PCV
are variable position to allow variable fuel delivery and
pressure control.
When the ECM actuates the piezo actuators, the rail
pressure drop is off-set by...

Fuel DeliveryThe eccentric on the HPP driveshaft (5) presses the
piston (3) upwards. The inlet valve (1) is then closed
through the force exerted by the valve spring and the
pressure being built up in the pump cylinder. The outlet
valve (2) opens when the pressure in the pump cylinder
is greater than the fuel pressure in the ring line (B).
(G421108) Technical Training154
Lesson 2 – PowertrainFuel Charging and Controls 

Volume Control Valve (VCV)
Piston1
Sleeve2
Compression spring3
Coil4
Armature5
VCV6
The VCV is fixed directly to the HPP.
The VCV regulates the fuel supply (and hence the
quantity of fuel) from the transfer pump to the HPP
elements, depending on the fuel pressure in the rail.
This makes it possible to match the delivery of the HPP
to the requirements of the engine from the low-pressure
side. The quantity of fuel flowing back to the main fuel
supply line is kept to a minimum.
In addition, this adjustment...

VCV not actuatedA
VCV actuatedB
Fuel supply from the transfer pump1
Piston2
Fuel supply to the HPP3
Coil energised4
Quantity of fuel5
Control current6
VCV at constant engine speed7
VCV Not Actuated (A)
When there is no power supplied, the piston (2) closes
the opening between the two connections (1) and (3)
through the force of the compression spring. The fuel
supply to the HPP is interrupted.
VCV Actuated (B)
The ECM energizes the coil (4) of the valve, according
to the engines requirements. The...