Man D 0826 LE, Руководство по эксплуатации

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Maintenance and care
30
D
If necessary, refill the circuit again with
fresh pickling fluid and pickle the en-
gine for another 8 hours
D
Drain the pickling fluid, fill the system
with tap water, and run the engine at
idle for 5 minutes to flush out all fluid;
then drain the water
D
Fill the system with a 1% soda solution.
Drain the soda solution after running
the engine at idle for 5 minutes, and
flush with tap water until the discharg-
ing water is clear
D
Fill cooling circuit with a mixture of po-
table tap water and anti-freeze with at
least 40% by volume, refer to Publica-
tion “Fuels, Lubricants ...”
Note:
Older radiators may develop leaks
when such deposits are removed. The
surge tank should be filled only up to
the bottom edge as otherwise foaming
will cause the pickling fluid to spill over.
Cleaning the inside of tube bundles of
raw water heat exchangers
(by authorized specialist personnel)
Deposits building up inside the tube
bundle of the water-to-water heat ex-
changer can reduce the flow cross-section
of the individual tubes to the point where a
decrease in engine cooling occurs. This
condition will automatically lead to over-
heating of the engine with all of its accom-
panying effects. For this reason, it is rec-
ommendable to clean the tube bundle of
the water-to-water heat exchanger at the
first sign of high engine coolant.
Procedure:
D
Remove and dismantle the heat ex-
changer (integrated in the coolant
surge tank)
D
Place the removed tube bundle in a
suitable container made of plastic, such
as PE, PP, PVC, GFK
D
Fill the container with undiluted original
pickling fluid at room temperature (Lith-
solventsäure or engine pickling fluid
RB-06) until the tube bundle is com-
pletely immersed
D
Allow the pickling fluid to work approx.
10 hours. If this time is not sufficient,
continue the pickling process for up to
5 hours
D
Pickling can be shortened by heating
up the fluid (max 50
°
C) and by oc-
casionally moving the tube bundle
D
After pickling thoroughly flush the
bundle with tap water and reinstall in
the heat exchanger
D
Use new gaskets (O-seals)
D
Mount the heat exchanger on the en-
gine and check for tightness
Note:
The variety of dirt deposits may also
create problems for the method of
pickling described above. In such
cases, we ask you to first of all submit
a specimen of the deposit for further
examination.
Damaged tube bundles may develop
leaks when dirt deposits are removed.