WÄRTSILÄ Vasa R22, Инструкция по эксплуатации

Страница: 180 / 297

The exhaust gas temperatures after the cylinder heads must not
exceed 500°C. If the engine is operated for longer periods with
exhaust temperatures close to 500°C with the rotor removed there
is a risk of piston seizure. This is due to the hot temperatures
internally the piston (cooling gallery) causing the lubricating oil
forming deposits in the cooling gallery. This will result in a poorer
cooling effect with more thermal expansion of the piston, one of
which in turn can lead to piston seizure.
During operation also closely follow that the lube oil tempera-
ture is kept at the level of normal operation.
Also other engine components will be exposed to the higher
thermal loading.
After the turbocharger rotor has been removed in accordance
with the instructions in the turbocharger manual, proceed in the
following way:
1 Remove the air duct (2) shown in Fig 15-1.
2 Make sure that the air entry into the charge air cooler
housing is clean and that no foreign particles can enter the air
inlet passage.
3 When the engine is loaded follow carefully the exhaust
gas temperatures do not exceed 500°C. It is to be noted that
the exhaust gas temperatures will increase by time and that
the operator should first let the temperatures be stabilized at
a certain load before the load is increased to the maximum
allowable. The maximum allowable load is in any case 20 % of
the nominal output of the engine.
The engine shall not be operated without the turbocharger in
function for more than 100 hours. If the engine has been in
operation with high thermal load it is recommended the engine
supplier is contacted in order to clarify the need for exchange of
components and/or inspections.
Note! Both the turbochargers on a V-engine must be removed or
blanked if one of them fails.
15.2 Charge air cooler
15.2.1 General maintenance
1 Condensate from the air is drained through a small
pipe (6), Fig 15-1 at the bottom of the cooler housing, after the
insert. Examine regularly that the pipe is open by checking the
air flow when running.
15 Turbocharging and Air Cooling 22-200520
15 - 8 VTR Turbocharger