Engine Lubrication: Testing and Inspection

Measuring Oil Pressure
Test condition: coolant temperature approx. 80°C.

1. Check oil level in engine; adjust to correct level, it necessary.
2. Raise oil filter cap together with oil filter element so that the engine oil flows out of the oil filter housing into the sump.
3. Install oil filter cap with oil filter element. Tightening torque 20 Nm.





4. Detach plug connection at oil pressure sensor (B5). Unscrew oil pressure sensor (85).
5. Screw in connection fitting (5) together with seal (6) in place of oil pressure sensor (BS).
6. Connect pressure gauge (1) with pressure line A (3).
7. Close T valve (2) at pressure gauge (1).
8. Measure oil pressure at the indicated engine speeds.

Engine RPM Oil pressure in bar
600-750 0.3 - 1.5
1000 0.7 - 3.0
2000 1.6 - 5.0
2500 2.0 - 5.5
3000 2.5 - 5.5
4000 2.7 - 5.5
6000 2.8 - 5.5

The readings obtained must reach the indicated minimum oil pressure.
If the oil pressure is lower than the indicated smaller figure (minimum oil pressure), the oil pressure warning lamp is activated and the oil pressure pointer is deflected to the bottom stop.

Testing Oil Pressure Sensor
Perform Steps 1 to 6, above. Then continue with step 9, below.
9. Connect oil pressure sensor (B5) together with threaded connection (9), seals (6) and adapter fitting (8) to the pressure line B(4).
10. Open T valve (2) at the pressure gauge (1) .
11. Connect oil pressure sensor (B5) to resistance measuring instrument (003) (multimeter).
12. With engine running, test resistance (ohms) of oil pressure sensor (B5).
The readings obtained must agree with the figures indicated.

Engine oil pressure in Oil pressure sensor
bar (gauge pressure): resistance in ohms:
0 3-16
0.3 17-34
1.8 102-125
3.0 163-195
3.5 170-223

If the resistance of the oil pressure sensor (B5) is outside of the tolerance of the indicated values, the oil pressure sensor should be replaced.