Maintenance and care
37
d) Warm up engine under load. After a
temperature of 60°C is reached, run
engine for a further 15 minutes
e) Drain cleaning fluid
f) Repeat steps c) and d)
g) Flush cooling system. To this effect
h) Replace drain plug by drain plug with a
bore of 8 mm dia
i) Fill cooling system with hot water
k) Run engine at idle for 30 minutes. At
the same time continuously replenish
the water leaking from the bore in drain
plug by adding fresh water
Repair water pump only now. Thereafter,
fill the cooling system with approved cool-
ing fluid. See Publication “Fuels, Lubric-
ants ...”.
Note:
Only sediments and suspended par-
ticles can be removed by this cleaning
method. If corrosion and lime deposits
are found, proceed according to the
following section:
Removal of lime deposits in the cool-
ing system
(by authorized specialist personnel)
Procedure:
D Drain the coolant
D Fill the system with undiluted original
pickling fluid (Lithsolventsäure or en-
gine pickling fluid RB-06), see sources
of supply
D Let the engine run (also in normal oper-
ation) for approx. 8 hours with this fill-
ing in the cooling circuit
D Drain the pickling fluid and thoroughly
flush the system with tap water
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
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