MAK M43C, Operating Instructions Manual

Page: 91 / 2027

Operational supervision
Exhaust system/supercharging
A3.06.06.31
M43/VM43
en / 04.04.2008 BA021181 1/6
1. Turbocharger: Compressor side
1.1 Preface
How fast the compressor stage (compressor impeller and diffusor) will be contaminated depends
on the cleanliness of the aspired air and the operating point.
Dirt will be deposited in the air ducts in particular when oil or salt mists or various types of dust are
aspired from the engine compartment or from outside.
Contamination of the compressor stage can impact the efficiency of the compressor and the
charge air pressure and lead to increased exhaust temperatures on the engine side, increased
fuel consumption, as well as rotor imbalances.
Note
Periodic cleaning (
see
A5.05.06.05.00.nn) of the compressor during operation can prevent or de-
lay an excessive increase of contamination, but it will not replace routine maintenance during
which the turbocharger is completely disassembled.
1.2 Cleaning procedure
In order to clean the compressor stage during operation, a built-in injection tube is used to spray
water into the filter muffler or the intake port in front of the compressor impeller.
Note
Cleaning is most efficient while the engine is operated at full load.
Water will not act as a solvent in this case. The deposits will be removed by the mechanical im-
pact of the water droplets. This procedure is suited as long as the contamination is not yet exces-
sive.
The cleaning device installed on the engine consists of one metering container used for washing
the turbocharger (or, both turbochargers on V-type engines) .
The following procedure is used for washing:
The surface of the water in the washing water container is pressurized using air from the air in-
take duct. Driven by the intake air pressure, the washing water will flow to the turbocharger to be
cleaned when the valve on the washing water container is activated.
Attention:
The BASIC POSITION of all valves in the air-side turbine washing system is as follows:
All VALVES ARE CLOSED
Opening or filling the washing water container when one or more valves are open may
cause injury or death of the operator.