MTU 12 V 2000 M92 Operating Instructions Manual page 119

7.19.4 Pump capacity – Check
WARNING
Fuels are combustible.
Risk of fire and explosion!
• Avoid open flames, electrical sparks and ignition sources.
• Do not smoke.
Checking pump capacity
1. Install suitable pressure gauge at the neck of the intake side of the pump.
2. Check pump pressure.
a) Switch on fuel treatment system (→ Page 45).
Note: The pressure limiting valve at the pump might respond and open. Audible noise is caused by overflowing
fuel and can be disregarded.
b) Close ball valve at the outlet of the fuel treatment system.
c) Check pressure at the pressure gauge in the inlet to the fuel treatment system and note it.
3. Check pump pressure with reduced suction.
a) Reduce suction pressure of pump to -0.8 bar with the shutoff valve at the pump intake side.
b) Check pressure at the pressure gauge in the inlet to the fuel treatment system and note it.
c) Open ball valve at inlet and outlet of fuel treatment system.
4. Calculate wear limit.
Example:
Measured value (normal condition).
Measured value (reduced suction condition).
If the measured value (reduced suction condition) is 10% lower than the measured value (normal con‐
dition), the wear limit is reached. Repair pump (contact Service).
3 bar
2.6 bar
M015700/06E 2012-06 | Task Description | 119