heating LAMBORGHINI MURCIÉLAGO 2009 Service Repair Manual
Page 371 of 1173
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Fig.4
® 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 $
( [ K D X V W * D V 7 H P S H U D W X U H & R Q W U R O ' H Y L F H
The exhaust pipe coming out from the catalytic converter features a thermocouple to read the temperature. This
thermocouple generates a signal in proportion to the exhaust gas temperature and sends it to a special electronic
control unit that switches on the “CATALYST RIGHT” or “CATALYST LEFT” warning light to which it is connected.
If there is an abnormal temperature increase in one of the catalytic converters the control unit intervenes as follows:•For temperatures ranging between 945 and 960 °C the “CATALYST” warning light switches on intermittently:
, Q W K L V F D V H L W L V Q H F H V V D U \ W R V O R Z G R Z Q W K H F D U X Q W L O W K H Z D U Q L Q J O L J K W V Z L W F K H V R I I W K H Q ¿ Q G W K H F D X V H R I W K H exhaust system overheating.
• For temperatures over 960 °C the “CATALYST” warning light stays on permanently and the fuel is cut off to
W K H L Q M H F W R U V R I W K H U H O H Y D Q W F \ O L Q G H U E D Q N , Q W K L V F D V H L W L V Q H F H V V D U \ W R V W R S W K H F D U D Q G ¿ Q G W K H F D X V H R I W K H exhaust system overheating.
When temperature drops below 800°C, normal functions are reset.
7 K H ³ & $ 7 $ / < 6 7 ´ Z D U Q L Q J O L J K W V D U H W H V W H G D Q G V Z L W F K H G R Q I R U D E R X W W Z R V H F R Q G V Z K H Q H Y H U W K H L J Q L W L R Q N H \ L V W X U Q H G W R ³ 0 $ 5 & , $ ´
, I W K H Z D U Q L Q J O L J K W G R H V Q R W V Z L W F K R Q R U V W D \ V R Q D I W H U W K H L Q L W L D O F K H F N W K L V Z D U Q V W K H G U L Y H U W K D W R Q H R I W K H W Z R W H P S H U D W X U H F R Q W U R O V \ V W H P V L V Q R W Z R U N L Q J H I ¿ F L H Q W O \
Page 397 of 1173
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Fig.2
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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 K H D L U F R Q G L W L R Q L Q J X Q L W ¿ W W H G X Q G H U W K H G D V K E R D U G L V H T X L S S H G Z L W K •a heating radiator connected to the engine cooling system;
• a conditioning evaporator connected to the car conditioning system;
• P R W R U I D Q V D Q G À D S V I R U Y H Q W L O D W L R Q D Q G D L U G L V W U L E X W L R Q F R Q W U R O
• internal and outside temperature sensor and solar irradiation sensor for temperature control.
Air conditioning unit (Fig.2)
A. Solar irradiation sensor (IRR)
B. Recirculation function actuator
C. Defrost function actuator
D. Frost sensor temperature sensor (TSAB)
E. Upper vent actuator
F. Outside temperature sensor (TE)
G. Passenger compartment temperature sensor (TA)
H. Lower vent actuator
I. Temperature sensor at upper vents (TT1)
L. Temperature sensor at lower vents (TT2)
M. Expansion valve
N. Motor fan regulator
O. Motor fan
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ED
B
Fig.3
C
® 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 $
The heating radiator is supplied by the engine coolant taken from cylinder head outlet through a special solenoid
Y D O Y H S U R S R U W L R Q L Q J L W V À R Z U D W H 7 K H P L Q L P X P À R Z U D W H W K U R X J K W K H U D G L D W R U L V J X D U D Q W H H G E \ D V S H F L D O P L Q L P X P S X P S ¿ W W H G R Q W K H U D G L D W R U H [ S D Q V L R Q W D Q N U H W X U Q O L Q H
Heating system (Fig.3)
A. Air conditioning unit
B. Heating solenoid valve
C. 0 L Q L P X P À R Z U D W H S X P S
D. Line to radiator expansion tank
E. Head water outlet line
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Fig.5
® 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 $
The air is distributed in the passenger compartment via a set of vents that guarantee proper air recirculation, heating and conditioning (Fig.5).
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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 $
Start-up transient strategy (cold engine)
The start-up transient strategy is a special operating method designed to ensure comfort to occupants also when the passenger compartment heating system is not able to work.
7 K L V L V E H F D X V H D W F R O G V W D U W L Q J W K H V \ V W H P G R H V Q R W K D Y H D Q D G H T X D W H V R X U F H R I K H D W 6 W D U W L Q J W K H F O L P D W H F R Q W U R O
under such conditions would entail letting in the passenger compartment a considerable amount of cold air which may annoy occupants. In such condition the system automatically sets to: •maximum heat;
• minimum ventilation;
• ' ( ) D L U À R Z G L V W U L E X W L R Q
• recirculation open;
• compressor on.
7 K H V \ V W H P K R O G V W K H V H V H W W L Q J V X Q W L O W K H H Q J L Q H Z D W H U W H P S H U D W X U H U H D F K H V D Y D O X H Z K L F K L V V X I ¿ F L H Q W I R U D X W R P D W L F climate control.
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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 U F R Q G L W L R Q L Q J V \ V W H P F K H F N
Check the following fundamental aspects to prevent malfunctioning and ensure the correct system operation: •Keep the climate control system control unit away from sources of high heat, e.g. in a painting oven (remember
that it is good practice to remove all electronic control units from the vehicle in this case);
• Remember to disconnect the negative battery terminal and all the electronic modules before performing
electrical welding operations on the vehicle (injection-ignition control unit, coil power modules, climate control / air conditioning system control unit, etc.);
• Do not apply voltage higher than or different from the vehicle battery voltage, e.g. when jump starting using an
auxiliary battery make sure that the voltage is the same and the connection polarity is correct;
• Always ensure the utmost cleanliness during coolant circuit maintenance operations. This is because particles
of dirt could obstruct the coolant passage through the expansion valve and cause poor system operation;
• Store receiver-driers in a dry place to ensure long life;
• Regularly check the conditions, alignment and tension of the compressor drive belt. Furthermore, check the
compressor oil level;
• Make sure that there are no leaks from the heating or air conditioning system;
• & K H F N W K D W W K H V \ V W H P L V F K D U J H G Z L W K D W O H D V W J U D P V R I V S H F L ¿ H G À X L G
• Check that the electrical connections of the various components and the system wiring are in good condition
(sensors, climate control unit, compressor, etc.);
• Always make sure that the coolant has been drained and collected in a suitable device before disconnecting
any line.
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Fig.4 Fig.5 Fig.6
® 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 $
Fig.4 •Normal situation with very high ambient temperature (>43°C);
• 7 R R P X F K F R R O D Q W H [ W U D
• Condenser overheating;
• Air inside the A/C system;
• (V ) The compressor’s displacement control valve is defective;
• 2 E V W U X F W L R Q L Q W K H K L J K S U H V V X U H V L G H E H W Z H H Q F R P S U H V V R U D Q G F R Q G H Q V H U S L S H ¿ O W H U E X W D I W H U W K H S R L Q W Z K H U H
the high pressure is read.
Fig.5• Normal situation with very low ambient temperature (>5°C);
• 7 R R O L W W O H F R R O D Q W G H ¿ F L H Q F \ & K H F N I R U F R R O D Q W O H D N V
• (V ( [ S D Q V L R Q Y D O Y H V W X F N F O R V H G R U R E V W U X F W H G
• (V 2 E V W U X F W L R Q L Q W K H O R Z S U H V V X U H V L G H R U W K H K L J K S U H V V X U H V L G H E H W Z H H Q W K H ¿ O W H U D Q G H Y D S R U D W R U
• 2 E V W U X F W L R Q L Q W K H K L J K S U H V V X U H V L G H E H W Z H H Q F R P S U H V V R U D Q G F R Q G H Q V H U S L S H ¿ O W H U E X W D I W H U W K H S R L Q W Z K H U H
the high pressure is read.
• Compressor damaged.
Fig.6 • Compressor belt failure. Probable cause: pulleys not aligned;
• The compressor’s electric clutch slips or does not engage;
• Compressor damaged;
• (V ) The compressor’s displacement control valve is defective.
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Fig.8 Fig.9
® 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
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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 $
• Check that the bearings are in good conditions, without traces of overheating and that the races, the turning
parts or the cages are not damaged
• & K H F N W K D W W K H W K U H D G L Q J D Q G W K H J U R R Y H G S U R ¿ O H V D U H Q R W G H Q W H G R U V F U D W F K H G
• Install the O-ring, the ball bearing and then the roller bearing outer ring on the hub ( Fig.8); repeat the operation
on the other hub.
• Install the ball bearing snap ring; repeat the operation on the other hub.
• Use a suitable pad to install the seal ( Fig.9); repeat the operation on the other hub.
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Fig.14
® 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 $
• Clean accurately all components.
• & K H F N W K D W W K H F U R Z Q W R R W K S U R ¿ O H V X U I D F H V D U H Q R W F U D F N H G R U V F U D W F K H G
• Check that the bearings are in good conditions, without traces of overheating and that the races, the turning
parts or the cages are not damaged.
• & K H F N W K D W W K H W K U H D G L Q J D Q G W K H J U R R Y H G S U R ¿ O H V D U H Q R W G H Q W H G R U V F U D W F K H G
Always replace the corresponding crown or the pinion after replacing the pinion or the crown.
• Introduce the crown on the planetary gear set and apply medium strength thread stop Loctite 52A43 and fasten
the mounting screws in a crossed order to the prescribed tightening torque:
crown screws: tightening torque (000800-6a)
• Use a suitable pad to install the roller bearing; repeat the operation on the other side.
Page 551 of 1173
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Fig.15 Fig.16
® 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 $
• Use a suitable puller to remove the inner bearing from the pinion. ( Fig.15).
• Clean accurately all components.
• & K H F N W K D W W K H S L Q L R Q W R R W K S U R ¿ O H V X U I D F H V D U H Q R W F U D F N H G R U V F U D W F K H G
• Check that the pinion bearings are in good conditions, without traces of overheating and that the races, the
turning parts or the cages are not damaged.
• Use a suitable pad to install the adjusting shim and the inner bearing on the pinion ( Fig.16).