Page 1009 of 2490
W
ater Pump Pulley Vehicles With: Supercharger
26.50.05
Removal
1. Open the engine compartment and fit paintwork protection sheets.
2. Remove the supercharger drive belt. Refer to Operation <<18.50.08>>.
3
. Slacken the three screws which secure the water pump pulley.
4
.
C
AUTION:
When releasing the belt tension, never apply any torque in a clockwise direction to the pulley
centre bolt (left hand thread) as it could subsequently loosen.
Page 1010 of 2490
Re
move the drive belt from the generator and accessory drive.
1. Use a spanner e.g. Churchill JD-230 or Snap On XDHM 1415, on the centre bolt of the belt tensioner idler pulley, to turn the adjuster assembly to the left against spring tension.
2. Whilst holding the tensioner against spring tension, remove the drive belt from the generator pulley. Release the tensioner slowly and remove the spanner.
Disconnect the belt from the other pulleys, as necessary, to move it clear of the pump pulley.
5.
Remove the pulley from the water pump.
1. remove the pulley securing screws.
2. Remove the pulley from the water pump.
Clean relevant parts and faces.
Installation
1.
Installation is the reverse of the removal procedure. Tighten the pulley securing bolts to 10-14 Nm.
Page 1011 of 2490
Supercharger Cooling - Water Pump
Re
moval and Installation
Remov
al
1.
O
pen the engine compartment and fit paintwork protection
sheets.
2. Di
sconnect the batt
ery ground cable.
R
emove the battery cover.
3. Remove the twin fan and motor assembly. Refer to Operation
26.25.12.
4. Disc
onnect the harness electrical connector.
R
elease the harness connector from the mounting bracket.
Disc
onnect the harness connector.
5. R
emove the two nuts which secure the pump to the flexible
mountings.
6. Reposition the pump to fit hose clamps.
Fi
t a hose clamp to the inlet pipe and one to the outlet
pipe.
Page 1012 of 2490

In
stallation
7.
Disc
onnect the pipes from the
pump and remove the pump.
1. Release and reposition th e hose clip along the inlet
hose and discon nect the hose.
2. Release and reposition the hose clip along the outlet
hose and disconnect th e pump from the hose.
3. Fit blanking plugs to the pipes and to the pump.
Remove t
he pump and mounting bracket assembly from
the vehicle.
8. Remove the moun
ting bracket and clamp from the pump.
1. Remove the nuts which secure the clamp.
2. Remove the clamp.
9. Clean the adjacent area of any water spillage.
1. Fitting is the reverse of the removal procedure.
2. Fit the twin fan and motor assembly. Refer to Operation
26.25.12.
3. Connect the battery and fit the battery cover. Refer to the
Battery Reconnection Procedure 86.15.15.
4. Switch on the ignition and allow the pump to operate for one
minute to circulate coolant.
Swit ch
off the ignition.
Top up th
e coolant
. If ne
cessary, refer to Operation
26.10.01 Coolant Refill Procedure.
Page 1013 of 2490
Fuel Ch
arging and Controls -
Torque Specific
ations
Com
ponent
Nm
Fue
l injector cl
amp plate bolts
4-
6
Inta
ke manifold fuel feed pipe to fuel rail bolts
8-
12
Inta
ke manifold fuel cross-over pipe to fuel rail bolts
8-
12
F
uel pressure regulator /
return pipe to fuel rail / intake manifold bolts
8-
12
Harness to
camshaft cover nuts
4-
5
F
uel pressure regulator / return
pipe to fuel rail bolts (SC)
8-
12
F
uel rail to charge air cooler adaptor bolts (SC)
18
-24
F
uel rail to fuel cross-over pipe bolt (SC)
8-
12
F
uel feed pipe to fuel rail bolts (SC)
8-
12
Page 1014 of 2490
Fuel Char
ging and Controls - Fuel Charging and Controls
Description an
d Operation
This section provides service informatio n for the fuel distribution components located on the engine and includes the
supercharger, where fitted. Refer to Section 310-01 for informatio n on the fuel tank, fuel lines and related fuel supply items.
Fuel Charging and Controls -
Normally Aspirated Vehicles
P
a
rts List
It
e
m
Par
t
Number
De
scr
iption
1—F
u
el feed from tank to bank 2
2—Fue
l
injector
3—Inta
k
e manifold/fuel rail
4—Te
st
/de-pressurization valve
5—F
u
el cross-over pipe
6—F
u
el pressure regulator
7—F
u
el return to tank
Page 1015 of 2490

Fuel D
istribution
Fuel is supplied to th
e engine
via eight fuel injectors (one pe r cylinder). The injectors are located in two fuel rails which r un
the length of each cylinder bank and ar e integral with the air intake manifold.
Fuel pumped from the tank enters a feed pipe at the rear of bank 2. Fuel flow is along bank 2 fuel rail, across the top front
of the engine (cross-over pipe) and through bank 1 fuel rail, the unused fuel re turning to the tank via a pressure regulator.
The fuel injectors are each controlled electrically from the engine control module (ECM).
A test valve is fitted to the cross-over pipe connecting the fu el rails at the front of the intake manifold. This valve allows the
fuel system to be depr essurized during servicin g and troubleshooting.
Fuel Injector
Eight, side-fed, dual straight-jet fuel injectors are fi tted in the fuel rails.
The injector consists of a solenoid, core, needle valve and ho using. When a control signal from the ECM is applied to the
solenoid coil, the needle valve lifts up and fuel is injected under pressure into the intake port. The fuel sprays from the
injectors are directed onto the back of the intake valves.
The injection quantity is determined by the length of time that the ECM signal is applied to the solenoid coil.
The injectors installed in the fuel rails of supercharged engines are of a higher flow rating than those installed in normally
aspirated engines and are secured in position by spring clips. Seals are instal led between the injector mounts of the fuel
rails and the related re cesses in the charge air cooler adaptors.
Pressure Regulator
Page 1016 of 2490
Pa
rts List
The pressure regulator is a diap hragm-operated valve that regula tes fuel-rail pressure at 3,0 bar above the intake manifold
pressure. A pipe connects the throttle induction elbow to the pressure regulator to provide the vacuum control signal. On
supercharged engines, the pressure regulator vacuum feed is taken from the top of the supercharger outlet duct.
The regulator is fitted between the rear end of the right-hand fuel rail (bank 1) and the fuel return line to the tank.
Circuit Diagram, Fuel Injection Syst em - Normally Aspirated Vehicles
Ite
m
Par
t
Number
De
scr
iption
1—F
u
el Return
2—F
u
el Pressure Regulator
3—Inta
k
e Manifold Pressure