The non-insulated areas of the gas admission casing for mounting the spin-
dle drives are completely covered by the spindle drives. This means that the
entire heat radiation of the gas admission casing is absorbed by the spindle
drives.
The cooling water is routed through the complete spindle drives through vari-
ous channels where it takes up the heat and dissipates it.
The cooling water must generally be taken from the high temperature area of
the engine cooling water circuit (HT). For maintenance work on the VTA, it is
advisable to install a shut-off option here.
Screwed sockets are provided on the turbocharger side for connecting the
cooling water. These are intended as an interface to the scope of supply of
the engine manufacturer.
The screwed sockets for the cooling water system are permanently fastened
to the adjustment device and the gas admission casing. The adjustment
device with the integrated cooling water system does not restrict the rotata-
bility of the gas admission casing.
See chapter
.
Turbocharger
Outside diameter (D) for con-
necting pipe in mm
Thread (G) of the screwed
socket
TCA55
16
M22 x 1.5
TCA66
16
M22 x 1.5
TCA77
20
M22 x 2
TCA88
20
M22 x 2
Table 11: Pipe connection for cooling water pipe
NOTE
The pipes from the cooling water source to the described inter-
face on the turbocharger are to be provided by the engine manu-
facturer.
The temperatures and pressures in the following table apply for the connec-
tion to the adjustment device:
Turbocharger
Minimum pressure
at the inlet in
Minimum pressure
differential between
inlet and outlet in
Required cooling
water flow rate in
Minimum tempera-
ture at the inlet in
Maximum tempera-
ture at the inlet in
bar
bar
l/h
°C
°C
TCA55
1.3
0.3
430
40
120
TCA66
1.3
0.3
430
40
120
TCA77
1.3
0.3
430
40
120
TCA88
1.3
0.3
430
40
120
Table 12: Technical data – cooling water
The cooling water temperature at the adjustment device is not explicitly
monitored!
Functional principle
Water quality
Connections,
pipes
Pressures, flow rates and
temperatures
Monitoring
2013-12-04 - de
4 Systems
4.2 Cooling Water System
MAN Diesel & Turbo
4
EN-US
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