Checking And Care Of The Treated Water - MAK M20 Operating Instructions Manual

M20-M601C
2.

Checking and care of the treated water

2.1 Anti-corrosion oil
A daily check of the coolant level in the sight glass on the expansion tank is just as important
as checking the anti-corrosion oil contents every 600 operating hours. During prolonged
operating breaks, a monthly check should be made.
Take the emulsion sample out of the supply line from expansion tank to pump and let it stand
for 1 h. Pour off oil which rises to the surface.
Carry out emulsion test e.g. with hand refractometer (specialist shop laboratory equipment) .
0 % – Cooling water change and cleaning necessary, see A4.05.09.02
< 0,5 % – Emulsion freshening required
0,5 - 1 %– Emulsion in order
> 1 % – Concentration too high, possibly incorrect measurement
In case the measured values are higher than 1.5 %, test again with fresh sample water. If the
result is confirmed, a correction of the emulsion is necessary.
Emulsion freshening in case of concentration too low
Mix required amount of oil according to diagram II (A4.05.09.04) with conditioning water to a
highly concentrated emulsion.
Always add oil to water
Fill in the mixed emulsion via the compensator reservoir, also possible with engine running.
Emulsion correction in case of concentration too high
Drain cooling water emulsion according to diagram II (A4.05.09.04) and refill the circuit with
conditioning water.
2.2 Chemical corrosion inhibitors.
The maintaining of the determined concentration is of decisive importance for a proper
corrosion protection.
A concentration check of the chemical corrosion inhibitors under consideration of the limit
values (see 1.2) is to be carried out with the relevant testing equipment every 150 h in
accordance with the instructions of the supplying companies.
After a freshening up of the concentration mix well with engine running!
en / 20.01.2000
Regulations and care
Treatment of cooling water
BA000202
A4.05.09.01
3/3