fuel pressure LAMBORGHINI GALLARDO 2009 Workshop Manual
[x] Cancel search | Manufacturer: LAMBORGHINI, Model Year: 2009, Model line: GALLARDO, Model: LAMBORGHINI GALLARDO 2009Pages: 1659, PDF Size: 95.1 MB
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DESCRIPTION TIGHTENING TORQUE (Nm) PICTURE
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/ D P E R U J K L Q L 6 S $ E D V H G R Q F R S \ U L J K W O D Z $ O O R I W K H 3 ' ) F K D S W H U V L Q W K H : ( % Z R U N V K R S P D Q X D O V G H V F U L E H G E H O R Z D U H E D V H G R Q L Q I R U P D W L R Q D Y D L O D E O H D W W K H W L P H R I S X E O L F D W L R Q 7 K H F R P S D Q \ U H V H U Y H V
W K H U L J K W W R P D N H X S G D W H V D Q G P R G L ¿ F D W L R Q V 7 K H I R O O R Z L Q J D U H S U R K L E L W H G U H S U L Q W L Q J U H S U R G X F W L R Q I R U Z D U G L Q J W R X Q D X W K R U L ] H G S H R S O H D Q G R U W K L U G S D U W L H V D Q G W U D Q V O D W L R Q L Q F O X G L Q J S D U W L D O Z L W K R X W
Z U L W W H Q D X W K R U L ] D W L R Q I U R P $ X W R P R E L O L / D P E R U J K L Q L 6 S $
7 L J K W H Q L Q J W K H R L O W D Q N G U D L Q S O X J
A. Tightening torque of plug 40
EXCEL 079100991D
Tightening the rails to the fuel pipe A. Tightening torque of the rail 128
PDM 400201-058
Tightening the air conditioning system pressure sensor Once tightened, apply yellow paint to the nuts and bolts using the special marker. A. Tightening torque of the sensor 5 ± 1
PDM 400260-015
6 H F X U L Q J W K H $ & V \ V W H P F R P S U H V V R U R Q W R W K H H Q J L Q H A. Tightening torque of screw 18
PDM 400260-036
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L714 00 11 00
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/ D P E R U J K L Q L 6 S $ E D V H G R Q F R S \ U L J K W O D Z $ O O R I W K H 3 ' ) F K D S W H U V L Q W K H : ( % Z R U N V K R S P D Q X D O V G H V F U L E H G E H O R Z D U H E D V H G R Q L Q I R U P D W L R Q D Y D L O D E O H D W W K H W L P H R I S X E O L F D W L R Q 7 K H F R P S D Q \ U H V H U Y H V
W K H U L J K W W R P D N H X S G D W H V D Q G P R G L ¿ F D W L R Q V 7 K H I R O O R Z L Q J D U H S U R K L E L W H G U H S U L Q W L Q J U H S U R G X F W L R Q I R U Z D U G L Q J W R X Q D X W K R U L ] H G S H R S O H D Q G R U W K L U G S D U W L H V D Q G W U D Q V O D W L R Q L Q F O X G L Q J S D U W L D O Z L W K R X W
Z U L W W H Q D X W K R U L ] D W L R Q I U R P $ X W R P R E L O L / D P E R U J K L Q L 6 S $
: + ( ( / $ / , * 1 0 ( 1 7
7 K H Y H K L F O H P X V W E H F R P S O H W H Z L W K D O O F R P S R Q H Q W V 0 H F K D Q L F D O E R G \ L Q W H U Q D O D Q G H [ W H U Q D O Z L W K R X W W K H V H W K H ¿ Q L V K H G Y H K L F O H ¶ V Z H L J K W Z R X O G G L I I H U
7 K H Y H K L F O H P X V W E H S R V L W L R Q H G R Q W K H D O L J Q P H Q W E H Q F K Z L W K W K H W L U H V L Q À D W H G W R W K H L Q G L F D W H G pressure required for alignment.
Table A
) U R Q W Rear
Vehicle height from ground (mm.) 130±5 140±5
Caster (°) 6° 15’ +/- 0° 15’
-
Total toe-in* (°) 0° 20’ +/- 0° 04’ 0° 20’ +/- 0° 04’
Camber (°) -1° 00’ +/- 0° 05’ -1° 25’ +/- 0° 05’
, Q À D W L R Q S U H V V X U H E D U 2.4 ± 0.1 2,2 ± 0,1
* Note: Total toe-in indicates the toe-in angle generated bythe toe-in of both wheels. The individual toe-in value is logically half the total value.
: K H H O D O L J Q P H Q W D W F X V W R P H U V H U Y L F H F H Q W H U V
The wheel alignment values intable Ashould be used on vehicles at customer service centers.
7 K H I X H O W D Q N V K R X O G E H H P S W \ Z K H Q F D U U \ L Q J R X W Z K H H O D O L J Q P H Q W
$ Q \ Y D U L D W L R Q V L Q Y H K L F O H K H L J K W G X H W R D I X O O I X H O W D Q N F D Q E H F R P S H Q V D W H G I R U D V V W D W H G L Q D W W D F K H G table
% .
7 D E O H %
) U R Q W Rear
Vehicle height from ground Z L W K H P S W \ I X H O W D Q N P P 130 ± 5 140 ± 5
Vehicle height from ground
with full fuel tank (mm.) 127 ± 5 136 ± 5
, W L V 1 2 7 S R V V L E O H W R F K D Q J H W K H K H L J K W R I W K H Y H K L F O H I U R P W K H J U R X Q G E \ P H D Q V R I W K H V K R F N D E V R U E H U V
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L714 01 03 03
C3C9C15C10C4
C1C7C13C12C6
C2
C8C14C16C11C5
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/ D P E R U J K L Q L 6 S $ E D V H G R Q F R S \ U L J K W O D Z $ O O R I W K H 3 ' ) F K D S W H U V L Q W K H : ( % Z R U N V K R S P D Q X D O V G H V F U L E H G E H O R Z D U H E D V H G R Q L Q I R U P D W L R Q D Y D L O D E O H D W W K H W L P H R I S X E O L F D W L R Q 7 K H F R P S D Q \ U H V H U Y H V
W K H U L J K W W R P D N H X S G D W H V D Q G P R G L ¿ F D W L R Q V 7 K H I R O O R Z L Q J D U H S U R K L E L W H G U H S U L Q W L Q J U H S U R G X F W L R Q I R U Z D U G L Q J W R X Q D X W K R U L ] H G S H R S O H D Q G R U W K L U G S D U W L H V D Q G W U D Q V O D W L R Q L Q F O X G L Q J S D U W L D O Z L W K R X W
Z U L W W H Q D X W K R U L ] D W L R Q I U R P $ X W R P R E L O L / D P E R U J K L Q L 6 S $
' L V D V V H P E O L Q J W K H K H D G V 3 U H O L P L Q D U \ R S H U D W L R Q V • Disassemble the engine (010003)
• Disassemble the Exhaust manifold (013103)
• Disassemble the coils (090503)
• Disassemble the variable valve timing mechanisms (011603)
Adopt the safety procedure to reduce the fuel pressure in the supply circuit (012803).
' L V D V V H P E O L Q J W K H U L J K W D Q G O H I W K H D G F R Y H U V 1. Disconnect the supply circuit pipe ( A-Fig.1) from the high pressure pump.
2. Free the 2 head covers ( B-Fig.1) from the 2 heads (one cover per head) by removing all 32 screws (16 screws
per cover).
5 H P R Y H W K H V F U H Z V R I H D F K K H D G I R O O R Z L Q J W K H D V F H Q G L Q J R U G H U I U R P & W R & V K R Z Q L Q ) L J
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L714 01 28 00
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L714 01 28 00
Fig.1
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L714 01 28 00
Fig.1
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G L $ X W R P R E L O L / D P E R U J K L Q L 6 S $ L Q E D V H D O O D O H J J H V X L G L U L W W L G ¶ D X W R U H 7 X W W L L F D S L W R O L 3 ' ) G L F X L V L F R P S R Q J R Q R L P D Q X D O L R I ¿ F L Q D : ( % G H V F U L W W L G L V H J X L W R V L E D V D Q R V X O O H L Q I R U P D ] L R Q L G L V S R Q L E L O L D O
P R P H Q W R G H O O D S X E E O L F D ] L R Q H & R Q U L V H U Y D G L D J J L R U Q D P H Q W R H P R G L ¿ F K H 6 R Q R Y L H W D W H O D U L V W D P S D O D U L S U R G X ] L R Q H O ¶ L Q R O W U R D S H U V R Q H Q R Q D X W R U L ] ] D W H H R D W H U ] H S H U V R Q H O D W U D G X ] L R Q H D Q F K H S D U ] L D O H
V H Q ] D O ¶ D X W R U L ] ] D ] L R Q H V F U L W W D G D S D U W H G L $ X W R P R E L O L / D P E R U J K L Q L 6 S $
* H Q H U D O G H V F U L S W L R Q R I W K H G L U H F W L Q M H F W L R Q V \ V W H P ' , 6
The
G L U H F W L Q M H F W L R Q V \ V W H P ' , 6 is comparable to the running of an indirect injection engine. The basic difference
is that in this case, the fuel is injected directly into the cylinder.
This system better optimizes the amount of fuel to be injected, so consumption – and consequently emissions – are reduced. Characteristics of the system • A low pressure pump having an operation range between 6 and 4 bar,
• 7 Z R L Q W D N H P D Q L I R O G V H T X L S S H G Z L W K W Z R D L U À R Z P H W H U V W K D W P H D V X U H W K H À R Z D Q G W H P S H U D W X U H R I W K H D V S L U D W H G
air (one per manifold),
• Two high pressure pumps mechanically driven by the motion of the engine can reach a pressure varying
between E D U 0 , 1 D Q G E D U 0 $ ; .
• High pressure injectors that directly inject the fuel into the cylinder crown.
• A special piston that allows a vortex to be created, inside of which the fuel vaporized at high pressure is
sprayed.
The system is designed for the following types of operation: • V W R L F K L R P H W U L F V W U D W L ¿ H G P L [ W X U H
• homogeneous mixture,
• homogeneous and rich mixture.
, Q R X U V S H F L ¿ F F D V H homogeneous operation is used:
I U R P W R U S P L Q V W R L F K L R P H W U L F V W U D W L ¿ H G P L [ W X U H H V S H F L D O O \ D W O R Z V S H H G V D Q G G X U L Q J W K H L J Q L W L R Q S K D V H V W R
help with emissions.Homogenous and rich running is used only when there is a demand for torque.
When running at low speeds, the injection system is further aided by a tumble system inside the intake manifold that
helps the vortex created by the design of the piston, ensuring that the quantity of injected fuel goes directly beneath the spark plug. In this way the mixture is optimized with a lower quantity of fuel.
The injection of fuel during the compression phase of the cylinder is managed electronically by two injection control
units, of which one works as the MASTER and the other as the SLAVE .
The injection system is controlled by two linear oxygen sensors that alter the amount of fuel according to the demand
of torque and engine rpm. There are also two latest generation three-way pre-catalytic converters ( A-Fig.1) (with two
oxygen sensors for their control) and two post-catalytic converters incorporated inside the silencer ( B-Fig.1).
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L714 01 28 00
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L714 01 28 00
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Fig.3
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Fig.3
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G L $ X W R P R E L O L / D P E R U J K L Q L 6 S $ L Q E D V H D O O D O H J J H V X L G L U L W W L G ¶ D X W R U H 7 X W W L L F D S L W R O L 3 ' ) G L F X L V L F R P S R Q J R Q R L P D Q X D O L R I ¿ F L Q D : ( % G H V F U L W W L G L V H J X L W R V L E D V D Q R V X O O H L Q I R U P D ] L R Q L G L V S R Q L E L O L D O
P R P H Q W R G H O O D S X E E O L F D ] L R Q H & R Q U L V H U Y D G L D J J L R U Q D P H Q W R H P R G L ¿ F K H 6 R Q R Y L H W D W H O D U L V W D P S D O D U L S U R G X ] L R Q H O ¶ L Q R O W U R D S H U V R Q H Q R Q D X W R U L ] ] D W H H R D W H U ] H S H U V R Q H O D W U D G X ] L R Q H D Q F K H S D U ] L D O H
V H Q ] D O ¶ D X W R U L ] ] D ] L R Q H V F U L W W D G D S D U W H G L $ X W R P R E L O L / D P E R U J K L Q L 6 S $
Funzionction , Q W D N H The
tumble throttle ( A-Fig.2) is opened depending on the position of the accelerator pedal.
To switch over intake ( B-Fig.2), the tumble throttle is open or closed depending on the point of operation:
• The intake switchover tumble W K U R W W O H L V F O R V H G L Q W K H P L G G O H O R D G U D Q J H D Q G U S P V R W K H D V S L U D W H G D L U À R Z V
inside the cylinder with a rotary movement, which has a positive effect on carburetion.
• As the load and rpm gradually rise, the air that can be aspirated only through the upper duct ( C-Fig.2) would no
O R Q J H U V X I ¿ F H 6 R W K H Q W K H tumble throttle opens the lower duct as well ( ' ) L J ).
, Q M H F W L R QThe fuel is injected directly into the cylinder by the high pressure injector ( ( ) L J ) during intake.
1 R W H
The energy necessary for evaporating the fuel is taken from the air contained inside the combustion chamber
that cools down. Thanks to this, it is possible to increase the compression ratio compared to that of an indirect injection engine.
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L714 01 28 00
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G L $ X W R P R E L O L / D P E R U J K L Q L 6 S $ L Q E D V H D O O D O H J J H V X L G L U L W W L G ¶ D X W R U H 7 X W W L L F D S L W R O L 3 ' ) G L F X L V L F R P S R Q J R Q R L P D Q X D O L R I ¿ F L Q D : ( % G H V F U L W W L G L V H J X L W R V L E D V D Q R V X O O H L Q I R U P D ] L R Q L G L V S R Q L E L O L D O
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Fuel pump
There is only one electric fuel pump (
A-Fig.6) and it is in the right tank. This pump is controlled by an ECU ( B-Fig.6)
which in turn is controlled by the master control unit.
The pump has an operating pressure ranging between 4 and 6 bar, depending on the various operating conditions
of the vehicle.
The pump sends the fuel to the two high pressure pumps (which are mechanical) that compress the fuel and take the pressure to a value varying from 120 to 140 bar, according to vehicle operation.
Both the high and low pressure pumps are monitored by two sensors installed on the respective lines to prevent overpressure problems. Linear phase transformers
Linear phase transformers allow the engine phase to vary according to the torque required in order to always have optimum phasing.
In this version they are always enabled, and the phasing follows different maps according to the load and the atmospheric conditions. Piloting is performed by a solenoid valve ( A-Fig.7), which makes the oil pass inside the phase-changing gear.
This operation is managed by the injection control units that also receive the position of the camshaft through the
Hall effect sensors ( B-Fig.7) mounted on the camshafts:
• two sensors for the exhaust (one per cylinder bank)
• two sensors for the intake (one per cylinder bank)
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L714 01 28 00
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G L $ X W R P R E L O L / D P E R U J K L Q L 6 S $ L Q E D V H D O O D O H J J H V X L G L U L W W L G ¶ D X W R U H 7 X W W L L F D S L W R O L 3 ' ) G L F X L V L F R P S R Q J R Q R L P D Q X D O L R I ¿ F L Q D : ( % G H V F U L W W L G L V H J X L W R V L E D V D Q R V X O O H L Q I R U P D ] L R Q L G L V S R Q L E L O L D O
P R P H Q W R G H O O D S X E E O L F D ] L R Q H & R Q U L V H U Y D G L D J J L R U Q D P H Q W R H P R G L ¿ F K H 6 R Q R Y L H W D W H O D U L V W D P S D O D U L S U R G X ] L R Q H O ¶ L Q R O W U R D S H U V R Q H Q R Q D X W R U L ] ] D W H H R D W H U ] H S H U V R Q H O D W U D G X ] L R Q H D Q F K H S D U ] L D O H
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Sensor
A
Speed sensor
B * H D U V S R V L W L R Q V H Q V R U V
C Secondary air pressure sensors
' Low fuel pressure sensor output
( Wiv pressure sensor output
F Oil pressure sensor output
G CAM sensors output
H Exhaust phase sensors output
, Intake phase sensors output
L Coolant temperature sensor output
M Air temperature sensor
1 A/C sensor
O Clutch pump sensor
3 $ , 5 % $ * V H Q V R U V
Q Coolant level sensor
5 Oil level and temperature sensor
Page 346 of 1659
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® Automobili Lamborghini S.p.A. 7 K H L Q I R U P D W L R Q D Q G S U R F H G X U H V S X E O L V K H G E H O R Z D U H V W U L F W O \ F R Q ¿ G H Q W L D O D Q G H [ F O X V L Y H O \ I R U W K H / D P E R U J K L Q L ' H D O H U 1 H W Z R U N D Q G $ X W K R U L ] H G 6 H U Y L F H 3 R L Q W V $ O O F R S \ U L J K W V D U H S U R S H U W \ R I $ X W R P R E L O L
/ D P E R U J K L Q L 6 S $ E D V H G R Q F R S \ U L J K W O D Z $ O O R I W K H 3 ' ) F K D S W H U V L Q W K H : ( % Z R U N V K R S P D Q X D O V G H V F U L E H G E H O R Z D U H E D V H G R Q L Q I R U P D W L R Q D Y D L O D E O H D W W K H W L P H R I S X E O L F D W L R Q 7 K H F R P S D Q \ U H V H U Y H V
W K H U L J K W W R P D N H X S G D W H V D Q G P R G L ¿ F D W L R Q V 7 K H I R O O R Z L Q J D U H S U R K L E L W H G U H S U L Q W L Q J U H S U R G X F W L R Q I R U Z D U G L Q J W R X Q D X W K R U L ] H G S H R S O H D Q G R U W K L U G S D U W L H V D Q G W U D Q V O D W L R Q L Q F O X G L Q J S D U W L D O Z L W K R X W
Z U L W W H Q D X W K R U L ] D W L R Q I U R P $ X W R P R E L O L / D P E R U J K L Q L 6 S $
6 $ ) ( 7 < 3 5 2 & ( ' 8 5 (
It is compulsory to carry out the safety procedure before disassembling the injection system
components.
% H I R U H G L V D V V H P E O L Q J D Q \ F R P S R Q H Q W V E H O R Q J L Q J W R W K H K L J K S U H V V X U H V \ V W H P V X F K D V W K H K L J K S U H V V X U H S H W U R O S X P S I X H O G L V W U L E X W R U L Q M H F W R U V I X H O F L U F X L W S L S H V H W F L W L V Q H F H V V D U \ W R U H G X F H W K H fuel pressure.
Strictly comply with the safety procedure to reduce the fuel pressure in the injection system.
5 H G X F L Q J W K H I X H O S U H V V X U H 1. Switch on the engine and leave it to idle for a few minutes. The pressure in the engine will fall to below 25 bar.
It is fundamental that the engine is allowed to idle during this phase.
2. Switch the engine off and remove the key from the ignition.
% H I R U H F D U U \ L Q J R X W D Q \ R I W K H V W H S V L Q W K H I R O O R Z L Q J S U R F H G X U H L W L V Q H F H V V D U \ W R H Q V X U H W K D W
E R W K E D W W H U \ W H U P L Q D O V D U H G L V F R Q Q H F W H G W R S U H Y H Q W W K H O R Z S U H V V X U H S X P S I U R P E H L Q J D F W L Y D W H G L I R Q H R I W K H Y H K L F O H G R R U V L V R S H Q H G
W K H H Q J L Q H L V F R O G W R D Y R L G W K H U L V N V R I E X U Q V
: $ 5 1 , 1 *
) L U H K D ] D U G ' 2 1 2 7 2 3 ( 5 $ 7 ( , 1 7 + ( 3 5 ( 6 ( 1 & ( 2 ) 1 $ . ( ' ) / $ 0 ( 6 2 5 7 2 2 / 6 7 + $ 7 & $ 1
6 7 $ 5 7 ) , 5 ( 6
Page 347 of 1659
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L714 01 28 03
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( ( ( ( (
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) ) )
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® Automobili Lamborghini S.p.A. 7 K H L Q I R U P D W L R Q D Q G S U R F H G X U H V S X E O L V K H G E H O R Z D U H V W U L F W O \ F R Q ¿ G H Q W L D O D Q G H [ F O X V L Y H O \ I R U W K H / D P E R U J K L Q L ' H D O H U 1 H W Z R U N D Q G $ X W K R U L ] H G 6 H U Y L F H 3 R L Q W V $ O O F R S \ U L J K W V D U H S U R S H U W \ R I $ X W R P R E L O L
/ D P E R U J K L Q L 6 S $ E D V H G R Q F R S \ U L J K W O D Z $ O O R I W K H 3 ' ) F K D S W H U V L Q W K H : ( % Z R U N V K R S P D Q X D O V G H V F U L E H G E H O R Z D U H E D V H G R Q L Q I R U P D W L R Q D Y D L O D E O H D W W K H W L P H R I S X E O L F D W L R Q 7 K H F R P S D Q \ U H V H U Y H V
W K H U L J K W W R P D N H X S G D W H V D Q G P R G L ¿ F D W L R Q V 7 K H I R O O R Z L Q J D U H S U R K L E L W H G U H S U L Q W L Q J U H S U R G X F W L R Q I R U Z D U G L Q J W R X Q D X W K R U L ] H G S H R S O H D Q G R U W K L U G S D U W L H V D Q G W U D Q V O D W L R Q L Q F O X G L Q J S D U W L D O Z L W K R X W
Z U L W W H Q D X W K R U L ] D W L R Q I U R P $ X W R P R E L O L / D P E R U J K L Q L 6 S $
$ ' L V D V V H P E O L Q J W K H L Q M H F W R U V 3 U H O L P L Q D U \ R S H U D W L R Q V
•Disassemble the engine hood(082703)
• Remove the engine aesthetic panels (Engine Bay) (081303)
• Remove the air intake manifold (012903).
' L V D V V H P E O L Q J W K H L Q M H F W R U V
It is compulsory to carry out the fuel pressure reduction safety procedure before disassembling the
injectors.
1. Disconnect the connector ( $ ) L J ).
2. Disconnect the fuel pipe ( % ) L J ).
3. Unscrew the screws that secure the stop ( & ) L J ) to the engine:
• 6 screws ( ' ) L J ).
• 5 nuts ( ( ) L J ).
• 6 screws ( ) ) L J ).
4. Remove the stop ( & ) L J ).
5. Disconnect the phase transformer actuator connector ( * ) L J ).
Page 353 of 1659
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L714 01 28 03
) L J
A
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) L J
) L J
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® Automobili Lamborghini S.p.A. 7 K H L Q I R U P D W L R Q D Q G S U R F H G X U H V S X E O L V K H G E H O R Z D U H V W U L F W O \ F R Q ¿ G H Q W L D O D Q G H [ F O X V L Y H O \ I R U W K H / D P E R U J K L Q L ' H D O H U 1 H W Z R U N D Q G $ X W K R U L ] H G 6 H U Y L F H 3 R L Q W V $ O O F R S \ U L J K W V D U H S U R S H U W \ R I $ X W R P R E L O L
/ D P E R U J K L Q L 6 S $ E D V H G R Q F R S \ U L J K W O D Z $ O O R I W K H 3 ' ) F K D S W H U V L Q W K H : ( % Z R U N V K R S P D Q X D O V G H V F U L E H G E H O R Z D U H E D V H G R Q L Q I R U P D W L R Q D Y D L O D E O H D W W K H W L P H R I S X E O L F D W L R Q 7 K H F R P S D Q \ U H V H U Y H V
W K H U L J K W W R P D N H X S G D W H V D Q G P R G L ¿ F D W L R Q V 7 K H I R O O R Z L Q J D U H S U R K L E L W H G U H S U L Q W L Q J U H S U R G X F W L R Q I R U Z D U G L Q J W R X Q D X W K R U L ] H G S H R S O H D Q G R U W K L U G S D U W L H V D Q G W U D Q V O D W L R Q L Q F O X G L Q J S D U W L D O Z L W K R X W
Z U L W W H Q D X W K R U L ] D W L R Q I U R P $ X W R P R E L O L / D P E R U J K L Q L 6 S $
& ' L V D V V H P E O \ K L J K S U H V V X U H I X H O S X P S 3 U H O L P L Q D U \ R S H U D W L R Q V •
Remove the Engine Bay (081303).
• Remove the air intake manifold (012903).
• Remove high pressure fuel pump 3 8 1 7 2 % .
' L V D V V H P E O \ K L J K S U H V V X U H I X H O S X P S 1. Softly screw the two nipples ( $ ) L J ) on the pump
8 V H D Q H Z Q L S S O H V D I W H U H Y H U \ U H P R Y D O
2. Softly screw the purge screw ( % ) L J ) on the pump.
8 V H D Q H Z S X U J H V F U H Z D I W H U H Y H U \ U H P R Y D O
3. Disassemble the pump ( ) L J )
1.High pressure pump
2. Nipple
3. Nipple
4. Purge Screw