LAMBORGHINI R3 EVO 85, Workshop Manual

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0-20
InTroduCTIon
0.3 - TIghTEnIng TorquEs
0.3.1 - general information
This chapter specifies the tightening torque values and resulting tension forces for tightening standard fastener hardware with ISO
metric threads.
It is not applicable for components with special self-locking systems, such as micro capsules, nylon lock rings etc.
0.3.2 - Tightening classes and categories
Four different tightening torque categories are applicable (1, 2, 3, 4), for three different joint classes (A, B, C), in accordance with
procedure GSPO PSM 13.0.0.
Table 17
TIghTEnIng CaTEgorIEs
1 2 3 4
Joint classes A Torque/angle con-
trol tightening with
manual or auto-
matic tools, subject
to monitoring and/
or with certification,
and used by trained
personnel
Torque control tight-
ening with manual
or automatic tools
subject to periodic
inspection and used
by trained personnel
B Torque/angle con-
trol tightening with
manual or auto-
matic tools, subject
to monitoring and/
or with certification,
and used by trained
personnel
Torque control tight-
ening with manual
or automatic tools
subject to periodic
inspection and used
by trained personnel
Torque control tight-
ening with manual
or automatic tools
subject to periodic
inspection
C Torque control tight-
ening with manual
or automatic tools
subject to periodic
inspection
Manual tightening
with suitable tools,
with no specified
torque value
Tolerances
Table 18
TIghTEnIng Class TolEranCE applICaTIon
1 ± 7.5% very difficult
2 ± 15% difficult
3 ± 30% common
4 None no specification
0.3.3 - Coefficient of friction
The friction coefficients used to calculate tightening torques have been defined in relation to the surface treatment applied.
Table 19
surfaCE TrEaTmEnT CoEffICIEnT of frICTIon rEfErEnCE sYmbol
With black post-treatment (Geoblack) μ 0.10 VI
Anti-seize phosphating μ 0.14 VII
Electrolytic zinc plating µ 0.17% II