Man E 0824 E 301, Руководство по эксплуатации, Страница: 28 / 48

Maintenance and care
26
Removal of lime deposits in the cooling system
Procedure:
D
Drain the coolant
D
Fill the system with undiluted original pickling fluid (Lithsolventsäure or engine pickling
fluid RB-06)
D
Let the engine run (also in normal operation) for approx. 8 hours with this filling 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 engine 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 en-
gine at idle for 5 minutes, and flush with tap water until the discharging water is clear
D
Fill cooling circuit with a mixture of potable tap water and anti-freeze with at least 40%
by volume (see “Fuels, Lubricants and Coolants for MAN Industrial Gas Engines”)
Note:
The surge tank should be filled only up to the bottom edge as otherwise foaming will
cause the pickling fluid to spill over.
Filler caps and working valves of cooling system
The rubber gaskets of the filler caps and working valves (negative pressure and positive
pressure valves) of the cooling system are subject to natural aging.
To preclude leakages in the cooling system and tailing pressure drop and its conse-
quences up to severe engine damage, renew the filler caps and working valves in line
with the change of coolant (every two years at the latest).
Waste water treatment
Drained and spent cleaning and pickling fluid should be brought up to a pH value of 7.5
to 8.5 with the aid of caustic soda. Once the precipitation has settled to the bottom of the
container the clear fluid above can be dumped into the sewer. The sludge at the bottom
should be taken to a special waste dump. Anyway, it is recommended to consult the local
authorities for more information about waste water rules or restrictions.