10 / 20
The reading on the engine oil pressure gauge is the..
  • A
    difference between the pressure pump pressure and the scavenge pump pressure.
  • B
    pressure of the oil upstream of the pressure pump.
  • C
    pressure of the oil downstream of the pressure pump.
  • D
    pressure in the oil tank.
The oil pressure is measured downstream (at the outlet) of the engine-driven pump. The main reason being that you want to be sure that the pressure at the pump’s output is enough to properly lubricate the engine parts. The pressure of a standard oil pump fitted in a reciprocating engine’s lubrication system is between 50-100 psi, however, this will depend on the size and loading of the engine itself. The pressure sensor can be either electrical or mechanical (bourdon tube).
 

Your Notes (not visible to others)



This question has appeared on the real examination, you can find the related countries below.