Lamborghini Diablo User Manual
02 - DRIVING TORQUES
Workshop manual - Diablo 6.0
02-1
CONTENTS
Engine
Engine control unit
Clutch
Gearbox
Propeller shaft
Front differential
Rear differential
Brakes
Suspension and steering
Bodywork
Workshop manual - Diablo 6.0
02-2
Engine
Workshop manual - Diablo 6.0
No. Description
1 Screws securing timing chain shoes on crankcase 30
2 M8 nuts securing engine stands to crankcase 28
3 Main oil duct closing caps 70
4 Screws securing connecting rod caps Engine oil
Clamping: torque + angle
Check: elongation torque at 60°
5 Oil pump filter M8 nuts 30
6 M8 nuts securing front cover to oil pump 30
7 M12 nuts securing crankshaft lower support on crankcase
first tightening
full tightening
8 M8 nuts securing crankshaft lower support on crankcase 30
9 M8 screw securing crankshaft lower support to crankcase (timing side) 30
Torque
15 + 60°
± 0.015 mm
0.115
55
40
90
[Nm]
Notes
± 10%
± 2°
÷ 85
± 7%
± 3% Molycote 1000
± 10% Molycote 1000
See figure 1 for
tightening order
± 10%
10 M8 nuts securing timing box to crankcase 30
11 Timing box to crankshaft screws 28
12 Cylinder head nuts 108 Molycote 1000
13 Not used
14 Driving pulley to crankshaft screw 140
15 Not used
16 Spark plug caps 80
02-3
± 10%
± 10%
See figure 2 for
tightening order
Workshop manual - Diablo 6.0
No. Description
Torque
[Nm]
17 Nuts securing camshaft supports on cylinder head 9
18 Not used
19 Gear to exhaust timing shaft screws 120
20 Phase variator on intake timing shaft 90
21 Phase variator screws 7
22 Hydraulic tensioners on cylinder head 45
Notes
030201
Fig. 1 – Tightening order for M8 nuts on crankshaft
support
030202
Fig. 2 – Tightening order for cylinder head nuts
02-4
Engine control unit
Workshop manual - Diablo 6.0
No. Description
1 Lambda sensor on exhaust 58.8
2 Spark plugs 17.6
3 Delivery couplings on fuel manifold 25
4 Outlet couplings on fuel manifold 25
Clutch
No. Description
1 Mechanism to flywheel securing screws
approach –
tightening 15.5
Torque
[Nm]
Notes
± 2
± 2
Torque
[Nm]
(arrow) to obtain H
Notes
Do not lubricate
See figure 3:
tighten screws 2
÷ 2 mm
H = 1
± 5% See figure 3 for
tightening order
2 Thrust block support sleeve nuts 9.25
3 Flywheel securing screws 39.2
02-5
Workshop manual - Diablo 6.0
030203
Fig. 3 – Flywheel mechanism tightening
Gearbox
No. Description
Torque
[Nm]
Notes
1 Shift lever housing screws 20
2 Fork and ratchet screws 29.4
3 Main /driven shaft idle gear ring-nut 230 Molycote 1000
4 Screws securing clutch bell to engine 25
5 Transmission gear ring-nut 180
6 Clutch oil seal flange nuts 9.3
7 Screws securing clutch bell to gearbox 25
8 Screws securing gearbox oil pump cover 29.4
9 Screws securing gearbox oil filter 29.4
10 Rear driving shaft bearing ring-nut 245
11 Turret upper support bolt 140
12 Gearbox upper cover screws 25
13 Front driving flange nut 176
02-6
Propeller shaft
Workshop manual - Diablo 6.0
No. Description
Torque
[Nm]
Notes
1 Propeller shaft flange fastening screws 39
2 Front differential axle shaft joint fastening screws 39
3 Rear wheel/differential axle shaft joint fastening screws 69
Front differential
No. Description
Torque
[Nm]
Notes
1 Differential crown fastening screws 70 Loctite 52A70
2 Differential cover fastening screws 30
3 Box hub fastening nuts 30
4 Propeller shaft flange fastening ring 150 Molycote 1000
Rear differential
No. Description
Torque
[Nm]
Notes
1 Differential box cover nuts 50 Molycote 1000
2 Not used
3 Pinion-pinion set flange fastening screws 30 Loctite 52A70
4 Axle shaft flange fastening screws 91.4 Loctite 641
Molycote 1000
5 Differential crown fastening screws 102
6 Crown beaaring pre-load flange fastening nuts 40 Molycote 1000
02-7
Brakes
Workshop manual - Diablo 6.0
No. Description
1 Not used
2 Brake shoe fastening screws 115
3 Hydraulic control fitting on shoe 18.5
4 Brake disc to hub fastening screws
5 Male ABS control unit hydraulic fitting 12
6 Female ABS control unit hydraulic fitting 16
Suspension and steering
No. Description
1 Front axle shaft to hub fastening nut 345
2 Front suspension upper arm fastening nut 85
3 Front/rear shock absorber fastening screws 85
4 Rear suspension upper arm fastening nuts 85
5 Front hub bearing fastening ring 490 Loctite 242
Torque
[Nm]
Notes
± 5 Loctite 222
± 1.5 Brake oil
± 1 Lubricating oil
± 2 Lubricating oil
Torque
[Nm]
Notes
± 5
± 5
± 5
± 5
6 Suspension arm ball joint housing on pillar 175
7 Steering arm joint fastening nut 44
8 Front pillar upper/lower joint fastening nut 69
9 Steering arm joint housing on pillar 62.5
10 Lifting system flow separator valve unit fittings 37
11 Steering box fastening screws 45
02-8
± 0.5
± 5 Loctite 270
± 2.5 Loctite 270
Bodywork
Workshop manual - Diablo 6.0
No. Description
1 Windscreen wiper arms
Tighten
Settle
Torque
[Nm]
35
30
Notes
02-9
10 - ENGINE
Workshop manual - Diablo 6.0
10-1
CONTENTS
Workshop manual - Diablo 6.0
DESCRIPTION P. 3
Cylinder numbering and direction of crankshaft rotation
SPECIFICATIONS AND DATA P. 5
Crankshaft
Connecting radius R
Crankcase
Piston liners
Pistons
Piston pin
Piston rings
Tappets
Valve guides (intake and exhaust)
Fitting between valve stem and relevant guide
Valve springs (intake and exhaust)
Engine cooling
REMOVAL AND REFIT P. 22
ASSEMBLY P. 23
COOLING CIRCUIT P. 33
Description
Radiators and electric fans
Thermostatic valve
Radiator removal
Filling up the system
LUBRICATION CIRCUIT P. 36
Description
Thermostatic valve
Oil pump check
Level check and oil replacement
PNEUMATIC UTILITY CONNECTIONS P. 40
CHECKS AND ADJUSTMENTS P. 25
Valve clearance
Locking the phase variator
Position check
Positioning
Timing regulation
Adjustment
Checking
Locking check on phonic wheel for engine timing sensor
10-2
Workshop manual - Diablo 6.0
DESCRIPTION
Otto cycle – 4 intake stroke engine, 12 V cylinders at 60°; timing system with 4 valves for each cylinder, double overhead camshaft
controlled by double chain, phase variator on intake, indirect MPI injection (one injector for each cylinder), static electronic ignition
(one coil per cylinder), liquid cooling with double radiator, forced lubrication with oil radiator, exhaust six in two in one with catalyst.
Aluminium alloy and H+T silicon “open deck” type crankcase with wet inserted liners.
Steel alloy liners with Nikasil treated internal surfaces. This treatment ensures a very high surface hardness.
This type of liner cannot be lapped.
Cr Mo hardened and tempered steel crankshaft, the working surfaces are hardened by gaseous nitriding. The crankshaft bearings
are smooth. The main bearing caps are integrated in a block structure to give maximum stiffness.
Each time the crankshaft is undersized, it is most important to restore the surface hardness by the special heat treatment.
Titanium alloy connecting rods with modular head, smooth bearings at big and small ends.
The pistons are in pressed light alloy with three rings, two seals and one oil scraper.
The cylinder heads are aluminium alloy and H+T silicon, with bronze valve guides and cast iron valve seats.
The timing system consists of two overhead camshafts for each cylinder bank, controlled by double chains with phase variator on
the intake shafts.
Motion is transmitted directly from the crankshaft to two gear wheels by means of a double chain. Each of these gear wheels in its
turn controls the two camshafts of each head by means of double chains.
The chain tension is ensured by hydraulic chain tighteners that operate with the lubrication circuit oil.
The cooling system with two cooling radiators is a closed loop system with forced circulation by a centrifugal pump belt driven by
the crankshaft.
The lubrication is forced by a gear pump with a vented gas recycling system and radiator to cool the oil.
10-3
Workshop manual - Diablo 6.0
Fig. 1 - Engine cross section
031001
10-4
Workshop manual - Diablo 6.0
Cylinder numbering and direction of crankshaft rotation
The engine rotation is anticlockwise (as seen from the timing side).
The engine cylinder banks are defined as right and left hand as seen from the flywheel.
The No. 1 cylinder is the first of the left hand cylinder bank near the flywheel, the numbering continues following a U towards the
right hand cylinder bank.
Fig. 2 – Numbering of cylinders
1 Engine flywheel side
2 Timing side
3 Direction of rotation
(counterclockwise from timing side)
181002
4 Travel direction
SX = Left hand cylinder bank (cylinder bank 1-6)
DX = Right hand cylinder bank (cylinder bank 7-12)
10-5
Workshop manual - Diablo 6.0
SPECIFICATIONS AND DATA
Crankshaft
Crankshaft end float 0.155 to 0.315
Crankpin and conrod journals surface hardness
HV1 630
Crankpin and conrod journals surface finish 0.2 mm
Crankpins:
Rated diameter D
2nd undersizing
Conrod journals:
Rated diameter d
2nd undersizing
62.966 to 62.979
62.712 to 62.722
45.482 to 45.500
45.236 to 45.246
Shoulders:
Rated width
Oversized thickness
The 1st undersizing is no longer available.
Whenever crankshaft undersizing is performed, it is most important to restore the surface hardness with special treatment of the NITREG type, attaining to these specifications:
temperature: 530 °C
times: rising 4 hours
holding 40 hours
descent 4 hours
depth of nitriding : 0.35 to 0.40 mm
hardness: HV1: 600 to 680
HV10: 550 to 630
white sheet thickness: < 10 microns
40.070 to 40.100
40.578 to 40.608
10-6
Fig. 3 – Crankshaft
Workshop manual - Diablo 6.0
031003
Connecting radius R
Crankpins 2.0 to 2.2
Conrod journals 2.0 to 2.2
Protrusion from crankcase edge (bushing) s 0.125 to 0.150 (*)
Bushing/shaft clearance 0.010 to 0.050
(*) apply a force P=5200 N as indicated in the figure.
10-7
Workshop manual - Diablo 6.0
031004
Fig. 4 – Crankshaft Fig. 5 – Crankshaft bearings
Crankcase
Crankpin seat diameter d 66.675 to 66.688
Liner seat diameter D 92.000 to 92.035
031005
Fig. 6 – Crankcase
031006
10-8
Workshop manual - Diablo 6.0
Conrods
Piston pin seat Ø (small end) d 20.020 to 20.030
Conrod bushing seat diameter (big end) D 48.626 to 48.642
Axis parallelism tolerance (piston pin-shaft) C – C1=
± 0.03
Conrod big end width 19.900 to 19.905
Conrod small end width 20.750 to 20.755
Distance between centres i 135.97 to 136.03
Piston pin and conrod small end bushing assembly clearance 0.020 to 0.080
Interference between piston pin bushing and conrod hole 0.050 to 0.096
Conrod journal bearings on crankshaft assembly clearance 0.024 to 0.067
Fig. 7 – Conrods
031007
10-9
The big end grooves are to face the crank arms when fitting the conrod-piston group.
If one or more conrods are replaced, it is essential that the spare parts are identical to the originals. (PANKL or LAMBORGHINI).
Piston liners
Rated diameter
Group A 86.995 to 86.985
B 87.005 to 86.995
C 87.015 to 87.005
Height ha 5
Diameter a
Group A 86.995 to 86.975
B 87.005 to 86.985
C 87.015 to 86.995
Height hb 60
Diameter b
Group A 89.995 to 86.985
B 87.005 to 86.995
C 87.015 to 87.005
Height hc 110
Diameter c
Group A 87.005 to 86.985
B 87.015 to 86.995
C 87.025 to 87.005
Workshop manual - Diablo 6.0
Liner protrusion from crankcase edge s 0.4 to 0.7 (*)
Maximum taper 0.02
Maximum ovalisation 0.03
Surface roughness 0.3 micron
(*) measure with a liner-stop pre-load P=30 [N]
10-10
The liners cannot be shimmed.
Workshop manual - Diablo 6.0
Fig. 8 – Liners
031008
10-11
Pistons
Rated diameter
Workshop manual - Diablo 6.0
Group A 86.900
B 86.910
C 86.920
Total height H 47.1
Piston crown-piston pin axis
height H1
Piston pin axis-lower edge
height H2
Step I – slot h height 6.1 to 6.3
Height I slot a 1.230 to 1.250
Height II slot b 1.770 to 1.790
Height III slot c 3.010 to
Pistons must always be coupled with liners belonging to the same group. Pistons and liners belonging to the same
engine must all be of the same group.
29.050 to 29.150
17.8 to 18.0
± 0.009
± 0.009
± 0.009
3.030
10-12
Fig. 9 – Pistons
Workshop manual - Diablo 6.0
031009
Piston pin
Diameter 19.995 to 20.000
Seat diameter 20.010 to 20.016
Piston pin-piston clearance 0.010 to 0.020
10-13
Piston rings
SLOT I
Height s 190 to 1.175
Thickness b 3.70 to 3.45
Gap between ends l 0.20 to 0.40 (*)
Slot-piston ring clearance 0.040 to 0.075
SLOT II
Height s 1.740 to 1.728
Thickness b 3.70 to 3.45
Gap between ends l 0.30 to 0.50 (*)
Slot-piston ring clearance 0.020 to 0.062
Diameter b
SLOT III
Height s 2.990 to 2.975
Thickness b 3.00 to 2.75
Workshop manual - Diablo 6.0
Gap between ends l 0.25 to 0.50 (*)
Slot-piston ring clearance 0.020 to 0.055
(*) measured with piston ring fitted in the liner.
10-14
Workshop manual - Diablo 6.0
Fig. 10 – Piston rings
0310010
10-15
Cylinder heads
Tappet housing diameter (a) 33.015 to 33.030
Intake valve seat housing diameter (b) 30.560 to 30.580
Exhaust valve seat housing diameter (c) 30.560 to 30.580
Valve guide housing diameter (intake and exhaust) (d) 12.00 to 12.018
Workshop manual - Diablo 6.0
Fig. 11 – Cylinder head
0310011
10-16
Valves
Intake
Stem diameter d 6.950 to 6.970
Reduced stem diameter d1 6.50 to 6.60
Valve head diameter D 33.3 to 33.5
Workshop manual - Diablo 6.0
Valve seat angle ° 45°
Height h 103.69 to 103.84
Tappets support thickness s 3.45
Exhaust
Stem diameter d 6.950 to 6.970
Valve head diameter D 29.3 to 29.5
Valve seat angle ° 45 °
Height h 103.59 to 103.74
Tappets support thickness s 3.35
Valve seats
Intake
Rated inner diameter 30
Rated outer diameter 34.7
Contact fascia angle 45°
Exhaust
± 5’
± 5’
± 0.10
± 0.01
Rated inner diameter 27
Rated outer diameter 32.7
Contact fascia angle 45°
10-17
± 0.10
± 0.01
Workshop manual - Diablo 6.0
Fig. 12 – Valves
Tappets
Diameter 32.974 to 32.990
Washer thickness range 3.25 to 0.70
with intervals of 0.05
10-18
0310012
Valve guides (intake and exhaust)
Rated outer diameter 12.040 to 12.050
Inner diameter with pressed and bored guide 7.0 to 7.015
Stem-guide clearance
Intake
Exhaust
Fitting between valve stem and relevant guide
Intake assembly clearance 0.025 to 0.055
Exhaust assembly clearance 0.035 to 0.065
Maximum shift between valve shank and head (head-stem
concentricity)
Intake
Exhaust
0.025 to 0.055
0.035 to 0.065
0.03
0.03
Workshop manual - Diablo 6.0
Assembly clearance between tappet and its seat (intakeexhaust)
Valve springs (intake and exhaust)
Inner spring
Free length (a)
With valve closed (b)
With valve open (c)
Compressed (d)
Load (with closed valve) P1
Load (with open valve) P2
Number of active coils
10-19
0.025 to 0.071
32.5
28
19
16.36
58.86
176.58
± 3.92 N
± 9.81 N
4.82
External spring
Workshop manual - Diablo 6.0
Free length (a)
With valve closed (b)
With valve open (c)
Compressed (d)
Load (with closed valve) P1
Load (with open valve) P2
Number of active coils
Fig. 12/1 - Valve springs
Engine lubrication
38.9
20.9
245.25
549.36
3.81
31
22
± 3.92 N
± 9.81 N
Circuit Forced lubrication with radiator and thermostatic valve
Radiator oil Single, separated
Pressure in circuit with hot engine (90°C)
– at 1000 RPM
– at 6000 RPM
Thermostatic valve
– start
– 9 mm
– max. stroke
10-20
1.5 – 2.5 [bar]
5 – 7 [bar]
80 °C
95 °C
11
Workshop manual - Diablo 6.0
Engine cooling
Circuit Forced circulation with thermostatic control
Radiators Two with fan
Fans
– on
80 °C
74 °C
– off
Circuit pressure with hot engine (max.) 1.2 [bar]
Thermostatic valve
– start
– 7 mm
– Max. stroke (at 95 °C)
80 °C
86 °C
11
10-21
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