Man D 0826 LE, Operating Instructions Manual

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Technical information
18
Intercooler
Before entering the cylinders the combustion air compressed in the turbocharger is
passed through a heat exchanger (intercooler).
Heat removal in the cooler is either by air (air-to-air intercooler) or, in case of the marine
application, by means of seawater (air-to-water intercooler) delivered by the raw water
pump.
It is important to provide a seawater filter ahead of the air-to-water intercooler.
In the case of extended standstills, cleaned seawater may be left in the intercooler, but
dirty water (brackish water) must definitely be discharged.
The seawater-operated intercooler must be regularly cleaned as required in order to
maintain its full cooling efficiency. If the engine output is found to drop, the reason may
be in a fouled-up intercooler. The intercooler has to be removed from the engine for
cleaning.
Cooling
The engine has a liquid-cooling system.
The water pump is a maintenance-free impeller pump driven by V-belts from the crank-
shaft pulley.
Depending on the agreed extent of delivery and the design of the engine, the coolant cir-
cuit can be equipped with temperature and level monitors which, in the event of over-
heating, will trigger an advance warning system or, in the event of loss of coolant, shut
the engine down.
Air cleaner
Air cleaner is mounted on the engine to purify the air for combustion.
The intervals at which the air cleaner requires servicing depend on the specific operating
conditions encountered. Clogged air filters may cause black smoke and reduce power.
A check should be made from time to time to see that the fastening elements securing
the air cleaner to the intake manifold seal the connection tightly. Any ingress of unfiltered
air is liable to cause a high rate of cylinder and piston wear.