M31-2 Reserve Engine Oil System M31001
Operation
Engine oil is circulated between the engine oil pan (1,
Figure 31-2) and the reserve tank (2) by two electrically
driven pumps (Pump 1 and Pump 2) within a single
pumping unit (4). The pumping unit is mounted on the
side of the reserve tank. The pump unit is equipped
with an LED monitor light on one side.
Pump 1 draws oil from the engine oil pan (1) at a preset
control point determined by the height of the suction
tube (6). Oil above this point is withdrawn and trans-
ferred to the reserve tank. This lowers the level in the
engine oil pan until air is drawn.
Air reaching the pumping unit activates Pump 2, which
returns oil from the reserve tank (2) and raises the
engine oil level until air is no longer drawn by Pump 1.
Pump 2 then turns "OFF". The running level is continu-
ously adjusted at the control point by alternating
between withdrawal and return of oil at the engine oil
pan. The oil returning to the engine oil pan is below the
normal operating level to prevent aeration of the oil.
LED Monitor Light
• Steady - Pump 1 is withdrawing oil from the
engine sump and bringing down the oil level.
• Regular Pulsing - Pump 2 is returning oil to the
engine sump and raising the oil level.
• Irregular Pulsing - Oil is at the correct running
level.
FIGURE 31-2. RESERVE SYSTEM SCHEMATIC
1. Engine Oil Pan (Sump)
2. Oil Tank
3. Oil Filter
4. Pumping Unit (1 & 2)
5. Air Relief Valve
6. Suction Tube
A. Oil Suction Line
B. Oil Return Line
C. Engine Oil Level
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