Operational supervision
Changing the type of fuel
A3.06.07.01
M20-M601C
en / 27.06.1996 BA000074 1/1
Ĺ
Changing the type of fuel
1. Changing over from distillate fuel to heavy fuel
Prepare the system according to A3.05.07.nn.
2. Changing over from heavy fuel to distillate fuel while the engine is running see diagram in
A3.04.07.nn.
If the engine is to continue with distillate fuel operation, the system must be changed over in
time because the change-over to distillate fuel will only be completed after 1/2 to 1 h.
The change-over has to be exclusively made by the three-way selector cock for heavy fuel/
distillate fuel.
The three-way cock in the return line (from the engine to the heavy fuel day tank and/or to the
mixing tank) has to remain in its position so that the excess fuel will be returned.
A differe nt procedure may lead to sticking (scuffing) of the injection pump plungers.
At the earliest, the circulating pump/final preheater should be switched off 1 h after change-
over.
Note:
A change-over of the flow towards the heavy fuel day tank (emergency) and
flushing with distillate fuel, to empty heavy fuel filled system more rapidly, is only
permitted when the engine has been shut down!
Fuel pressure system (only within heavy oil circle):
The fuel pressure may only be set at the pressure regulating valve, before the mixing tank.
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