Assembly Instructions / A238-H.. - A240-H..
4 Installing the turbocharger / 4.5 Fastening the turbocharger with a standard nut
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HZTL455311P0042_EN
Rev. B
May 2022
Loosening the clamping nut
It is imperative to proceed as follows if the clamping nut has to be loosened again:
CAUTION
Incorrect procedure can make loosening impossible
If individual pressure screws are fully relieved, the pressure screws can become
compressed, making it impossible to loosen them.
u
Comply with the following steps for loosening the pressure screws.
Fig. 12: Loosening the clamping nut
u
Working in a circle, break loose all pressure screws of the clamping nut.
u
Working in a circle, loosen each of the pressure screws by about ¼ of a turn (90°).
u
Repeat the previous step until all pressure screws are relieved of pressure.
u
Loosen clamping nut by hand.
4.5
Fastening the turbocharger with a standard nut
u
Fit the nuts and tighten them according to variant 1 or 2 in the table below.
Product
Through hole in
bearing casing [mm]
Fixing screws [mm]
Variant 1: Tightening
torques [Nm] **)
Variant 2: Hydraulic
pre-tensioning
forces [kN]
A238-H
Ø 21
M20
560
175
A240-H
Ø 25
M24
900
235
Table 10: Tightening torque for standard nuts
**) When the turbocharger is mounted on the engine support, the bolt threads and screw heads must
be lightly oiled (assumed friction coefficient
µ
= 0.12 for tightening torque)
u
Remove the lifting gear.
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Summary of Contents for A200-H
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