The charge air and exhaust system during operation or just after the engine has
been stopped most of the engine will be hot touching the engine parts may cause
burns in this system be especially aware of the following parts the turbocharger
and connecting piping will get extremely hot the charge air receiver may reach 70
degrees Celsius the exhaust system will get extremely hot even though the
exhaust manifold is well insulated flanges especially close to the
turbocharger may cause severe burns
charge airs drawn through the compressor side of the turbocharger and continues
to the charge air cooler fitted beneath the turbocharger after the charge air
cooler the flow goes through the charged air manifold from the manifold the air
is distributed to each cylinder after combustion the exhaust valves open to
the exhaust manifold the manifold leads the exhaust flow back to the
turbocharger what it drives the turbine rotor thereafter it is carried through
possible heat exchangers and silencers to the atmosphere look for any leakages
tighten and change seals if necessary when operating on heavy fuel oil the
exhaust temperature will increase somewhat due to the slower combustion of
that type of fuel an increase of approximately 10 to 20 degrees Celsius
over diesel oil operation is normal it is important that the values from these
instruments are checked and recorded every day according to the log sheet to
assure that the operating staff will notice significant changes click the
components for further information the exhaust gas from the engine drives the
turbine which drives the compressor the compressor unit sucks in and
compresses the air required for the engine click the text the compressor
side of the turbocharger should be washed daily this should be carried out
at no less than 75% engine load remove the screw on the top of the tank fill
0.4 liters water into the water tank
tighten the screw actuate the valve towards the spring and hold it for about
10 seconds until all water's been injected engines running on heavy fuel
oil should have the turbochargers turbine washed once a week
run the engine a marine diesel oil during the water washing open the drain
cock and ensure that hot exhaust is coming out of the drain Pike if not
clear the blockage
adjust charge air pressure to 0.3 bar by reducing engine load run for five
minutes before washing
connect cold water supply from the ships freshwater system to the water pressure
regulator connection open the water injection valves before carefully
opening the water to the hose
check water pressure if necessary adjust 1 plus minus 0.2 bar
cleaning should go on for 10 minutes only water vapor and some drops of water
will come out of the drain cock
shut up water to the holes and close the water injection valves disconnect the
hose
run the engine at same load for five minutes to dry up the turbine then shut
the drain cock
increase engine load to normal for evaporating of condensed water the
compressor side of the turbocharger check oil level once a day the oil level
should be inside the red circle while it stands still
if check oil level once a day the oil level
should be inside the red circle while it stands still if the color of the lube
oil has turned significantly darker than it was the day before there is a
possibility for seriously damaging the turbocharger increased foaming in the
oil gauge glass is an indication that the oil should be changed remember both
bearings have their own oil reservoir the turbocharger must not run when oil
is being changed open the drain plug and the filling plug on the bearing housing
cover and drain the used oil fast in the drain plug fill the lubricating oil up
to the upper mark on the sight glass
place the gasket on the filling plug and fasten it thoroughly remember both
bearings have their own oil reservoir
generally we recommend a synthetic lubricating oil which should be changed
at least once per 5000 operational hour when refilling oil follow the same
procedure as when changing oil except from opening drain plug remember both
bearings have their own oil reservoir the main purpose of the charge air
cooler is to reduce the temperature of the charged air engines running on heavy
fuel oil are always fitted with two-stage coolers Stage one is connected
into the engines jacket water circuit while Stage two is cooled by seawater or
low temperature freshwater the heat from the jacket water is used to heat the
charged air at low engine load to stage air coolers are fitted with drain
channels to ensure detection of leakages if water leakage water will come out of
the telltale hole air leakage can be detected by whistling sound in case of
water or air leakage the end cover gasket has to be replaced if a sea water
cooling system is used the end covers should be disassembled at regular
intervals for inspection and cleaning when out of service for longer periods
drain and leave drain and venting cocks open if using sea water cooling flush
with fresh water
the insulation screen must always be in place when the engine is running because
the exhaust manifold is hot and contact may cause fire or burning accidents