Man D2868 LE426, Operating Instruction

Page: 91 / 134

Maintenance and Care
MAN marine diesel engines D2868 LE4.. / D2862 LE4..
89
Carefully read through the Operating Instructions before starting any work!
This particularly applies to the General Safety Instructions section
and the safety instructions in the various chapters.
Engine installed horizontally
The bleed screws 1 and 2 are above the coolant
level in the expansion tank
4
.
In this case, complete filling and bleeding of the
cooling system is only possible if the cooling sys­
tem is filled via the drain/filler valve
5 on the side
of the crankcase.
This is performed using a pump 6 :
1. Undo the bleed screws 1 and 2 .
2. Open the cover on the filler neck 3 .
3. Connect the filler hose of the pump 6 at the
drain/filler valve 5 .
4. Switch on the pump and fill the cooling system
until coolant emerges at the filler neck
3
.
Switch off the pump.
5. Screw in the cap 3 as far as the stop but do
not tighten it.
Overtightened caps can not be opened again.
6. Switch on the pump again until coolant
emerges at the bleed screw
1
without bubbles.
7. Switch off the pump and tighten the bleed
screws 1 .
8. Switch on the pump again until coolant
emerges at the bleed screw
2
without bubbles.
9. Switch off the pump and
tighten the bleed screws 2 .
10.Unscrew the pump filler hose, screw the cap
onto the drain/filler valve 5 and tighten it.
11. Leave the engine running at a speed of
1200 rpm for around 15 minutes.
12.Stop the engine.
13.The coolant level on the sight glass
7 of the
expansion tank must be in the middle of the
sight glass.
14.Before the next startup (with the engine cold),
check the coolant level and top up as neces­
sary. To top up, carefully undo the cap
8 partly
in order to release the pressure, then carefully
open it and top up the coolant.
The turbochargers must not be vented while the
cooling system is being topped up.
Keep repeating this procedure until it is not pos­
sible to top up the coolant any more.