Lamborghini Diablo Engine. Manual - part 3

Workshop manual - Diablo 6.0

10-34

Description
Closed loop cooling system with forced circulation by centrifugal pump belt-driven by the crankshaft.
Main components:
• two radiators

•

centrifugal pump

• two electric fans

•

sensor for temperature gauge

• thermostatic valve in thermostat body

•

pipes for self-drain system

Fig. 22 – Water pump and thermostat

131024

Coolant temperature sensor

Thermostat

Thermostat cover

Pump impeller

Front seal

Shaft

O-ring

Pump casing

Belt

Pulley

Belt tensioner assembly

Coolant temperature sensor

Index

Workshop manual - Diablo 6.0

10-35

Radiators and electric fans
The radiators are fitted with a tap in the lower part to drain off the water, and two caps in the upper part to bleed off the air.
The engine control unit governs the switching on of the electric fans according to the coolant temperature and when the air condi-
tioning system is activated.

Thermostatic valve
The thermostatic valve is located in the thermostat body.
Expansion reservoir
The expansion reservoir compensates the coolant volume variations caused by engine heating.
The reservoir cap is fitted with a gauged valve that controls the system maximum pressure.
Always fill and top up the cooling system through the expansion reservoir filler.

Radiator removal
To remove the radiators proceed as follows:
• take off the exhaust system and the catalytic converters;
• remove the left and right wheel housings;
• remove the water sleeves;
• unscrew the radiator fixing bolts;
• take off the radiators from the side towards the car centre.

Filling up the system
• fill up the system through the expansion reservoir;
• remove the expansion reservoir cap;
• check the level in the expansion reservoir during heating;
• heat the engine to operating temperature to allow the thermostat valve to open;
• select HI C/F on the digital display of the air conditioner so that the heating radiator liquid starts to circulate;
• top up the expansion reservoir;
• as soon as the fans start, fit on the expansion reservoir cap;
• check the level again when the engine is cold.

Since the coolant temperature is read by the relevant sensor the thermal contact is no longer installed on the radiator.

Index

Workshop manual - Diablo 6.0

10-36

LUBRICATION CIRCUIT

Description
Force feed lubrication system with gear pump with oil vapours re-cycling. Oil cooling system with thermostatic valve.
Main components
• oil pump with internal gears and pressure regulator valve;
• thermostatic valve in thermostat body-filter seat
• radiator;
• cartridge filter;
• pressure sender;
• temperature sender;

Fig. 23 - External circuit

031025

1 Oil pressure sensor
2 Thermostatic valve body

and filter seat

3 Oil return pipe
4 Oil delivery pipe
5 Oil radiator
6 Oil filter

Index

Workshop manual - Diablo 6.0

10-37

Thermostatic valve
The lubrication system is equipped with a thermostatic valve that according to the oil temperature allows the oil passage through
the heat exchanger. The thermostatic valve is located on the thermostatic body/filter seat.
The main checking data is:

Temperature (°C)

Stroke

start

9 mm

Max. stroke

11 mm

Fig. 24 - Thermostatic valve

031026

1 From oil pump : 1a – To oil

radiator; 1b – From oil
radiator

2 To filter
3 To engine
A Valve open, oil path 1-1a-

1b-2-3

B Valve closed, oil path: 1-

2-3

Index

Workshop manual - Diablo 6.0

10-38

Oil pump check
• check the pump body and cover, replace the parts if there are scorings;
• clean suction and delivery carefully with a petroleum jet and compressed air;
• check the driving and driven gears; if they are in bad condition or worn replace them;
• check clearances;
• check that the relief valve piston moves properly in its seat;
• check the bearing.

Fig. 25 - Oil pump

181027

1 Crankshaft
2 Coupling
3 Pump body
4 Driven gear
5 Driving gear
6 Timing system cover
7 Pressure regulator
8 Pulley
9 Oil seal

Index

Workshop manual - Diablo 6.0

10-39

Level check and oil replacement
Check the oil level with the dipstick every 500 km, preferably with the engine cold. If the engine is hot, wait a few minutes to allow
the oil to flow back to the sump.
Replace the oil when the engine is hot, draining it through the drain hole (A) in the bottom of the sump.
To have access to the engine oil filter remove the panel in the bottom of the car.
• remove the oil filter and replace it with a new one, after lubricating the seal with engine oil.
• fit the filter and tighten by hand.

Check conditions of calibrated hole (arrow) and clean if required.

Fig. 26 – Engine oil drainage cap

Fig. 27 – Engine oil filter

031028

181029

Index

Workshop manual - Diablo 6.0

10-40

PNEUMATIC UTILITY CONNECTIONS

(EEC versions only)

Fig. 28 - Pneumatic utility connections
1 Vacuum reservoir
2 Intake manifold block 7-12
3 ENCS system solenoid valve
4 ENCS system actuators

181030

Index

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