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Assembly Instructions / TPL65-A ... TPL77-A, TPL65VA
4 Installing the turbocharger / 4.1 Steps for fastening the turbochar-
ger
Product
Thread
size
TPL65-A
M20
TPL65VA
M20
TPL69-A
M24
TPL73-A
M24
TPL77-A
M30
Table 7
1)
Some brackets have through-holes for attaching the turbocharger or the threads start just
a few millimetres below the contact surface. This additional tightening angle must be taken
into consideration (after meaningful rounding) so that the screw always has the same high
pre-tensioning force.
Due to the special foot design of this turbocharger, the foot is not in contact with the
bracket in the area of the screw holes as long as the screws have not been tightened. Ini-
tially, the foot only touches the bracket at the centre of the foot.
1. In Z configuration, hand-tighten without tools.
2. In Z configuration, tighten to 50% of pre-tightening torque.
3. In Z configuration, tighten to 100% of pre-tightening torque.
Fig. 1: Contact surface, turbocharger attachment
4. Use the feeler gauge (0.05 mm) to check whether 25% of the surface of the screw con-
tact points is in contact with the bracket (see diagram).
CAUTION
Insufficient pre-tensioning force
If the surface (A) of the contact points has insufficient contact before apply-
ing the tightening angle, the pre-tensioning force will be too small and the
screws will become loose and break.
Tighten the screw until 25% of the surface (A) is in contact with the
u
bracket.
5. Tighten the screws with the specified tightening angle in a Z configuration.
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Height a of tensioned
turbocharger foot
[mm]
64
64
75.5
88
104
Pre-tightening
Tightening
torque
angle for ten-
[Nm]
sioned height a
90
90
160
160
300
HZTL455311P0017_EN
Additional
tightening
1)
angle
for
[DEG]
every 10 mm of
additional
screw length b
[DEG]
33
4.4
33
4.4
32
3.7
35
3.5
37
3.1
Rev.A
July 2020