MAK M 20 - Sequence of Operations

Turbocharger
Maintenance / Cleaning
A5.05. 06.13.01.00
300
M20
en / 31.05.2010 IB001462 1/2
06
See also:
Spare parts list: B1.05.06.n.7259
Time requirement: 1 Pers./ 0,50 h
Personnel qualification: skilled engine hand
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Operating medium: Heavy fuel and distillate fuel
Maintenance:
Cleaning of the turbocharger every 300 h
Sequence of operations:
1. Cleaning
1.1 Connect the cleaning pipe (2) with the
water supply (detachable hose clip (1) with
stop valve [3]).
1.2 Reduce the engine output to 20 % load
and exhaust gas temperature at the
cylinder outlets to 280 - 300 °
°°
°C.
1.3 Open corner valves (4) and stop valve (3)
and adjust water pressure on pressure
gage (5) to
1.2 - 1.5 bar.
Washing duration: 5 minutes
1.4 Close stop valves and corner valves and remove hose clip (Fig. 1/1).
1.5 Run the turbocharger dry with a written engine load approx. 30 min., then increase engine load
NOTE
Particulary if the engine is running on the heavy fuel, deposits will form on the turbine
blades decreasing the charger efficiency and increasing the bearing loads by unba-
lance. These deposits must be removed by injecting freshwater (without addition of
detergents or solvents). The washing intervals depend on the fuel quality and the
operating conditions, and they can only be fixed by experience in operation.
It must always be prevented that water enters the exhaust manifold between the
washing operations. For this reason, the hose piece (Fig. 1/1) is to be removed after
washing.
2 4
1
5
3
Fig. 1