MTU 12 V 2000 M72 Operating Instructions Manual page 50

Simulation of filter replacement with the engine running: HAT
1. Switch on fuel treatment system (→ Page 52).
2. Start engine (→ Page 53).
3. Run engine at idling speed.
4. Close ball cock (5) at the inlet to the fuel treatment system.
Result: The pressure upstream of the fuel treatment system increases until the overflow valve at the pump unit
opens and fuel flows through bypass (3) and bypass (2).
5. Open ball cock (19).
Result: Fuel emerges. If no fuel emerges:
• Open ball cock (5) at the inlet to the fuel treatment system.
• No function of bypasses (2) and (3); carry out functional test of bypasses (2) and (3) .
6. Check suction pressure (see technical data of the engine) at the fuel delivery pump.
Note: If the suction pressure is within the permissible limits and engine operation is satisfactory:
7. Increase engine speed to 1000 rpm and monitor suction pressure.
Result: If all engine operating values are within the specified limits, open ball cock (5) at the inlet to the fuel treat‐
ment system.
Simulation of power failure (emergency): HAT
1. Switch on fuel treatment system (→ Page 52).
2. Start engine (→ Page 53).
3. Run engine at idling speed.
4. Switch off pump (21) on switchgear cabinet.
Result: The engine-mounted fuel delivery pump sucks fuel via bypass (2) directly from the tank.
5. Check suction pressure at the engine-mounted fuel delivery pump.
Note: If the suction pressure is within the permissible limits and engine operation is satisfactory:
6. Increase engine speed to 1000 rpm and monitor suction pressure.
Result: If the suction pressure is within the specified limits, simulation was successful.
Simulation of power failure (emergency): SAT
1. Switch on fuel treatment system (→ Page 52).
2. Start engine (→ Page 53).
3. Run engine at idling speed.
4. Switch off pump (21) on switchgear cabinet.
Result: The engine-mounted fuel delivery pump sucks fuel via bypass (2) directly from the tank.
5. Check suction pressure at the engine-mounted fuel delivery pump.
Note: If the suction pressure is within the permissible limits and engine operation is satisfactory:
6. Operate engine at full load and monitor suction pressure.
Result: If the suction pressure is within the specified limits, simulation was successful.
50 | Operation | M015650/03E 2011-10