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Assembly Instructions / A200-H
4 Installing the turbocharger / 4.5 Fastening the turbocharger with a
standard nut
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 be-
come compressed, making it impossible to loosen them.
Comply with the following steps for loosening the pressure screws.
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Fig. 12: Loosening the clamping nut
Working in a circle, break loose all pressure screws of the clamping nut.
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Working in a circle, loosen each of the pressure screws by about ¼ of a turn (90°).
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Repeat the previous step until all pressure screws are relieved of pressure.
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Loosen clamping nut by hand.
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4.5
Fastening the turbocharger with a standard nut
Fit the nuts and tighten them according to variant 1 or 2 in the table below.
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Product
Through hole in
bearing casing
[mm]
A238-H
Ø 21
A240-H
Ø 25
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)
Remove the lifting gear.
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© Copyright 2021 ABB. All rights reserved.
Fixing screws
Variant 1: Tightening
[mm]
torques [Nm] **)
M20
M24
HZTL455311P0042_EN
Variant 2: Hy-
draulic pre-ten-
sioning forces [kN]
560
900
235
Rev.A
September 2021
175
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