LUBRICATION
Tests and Adjustments
12/05
BY Service Manual
8-7
© 2009 Yanmar Marine International
Check Engine Oil Pressure
Perform an engine oil pressure check if there is any
indication of low oil pressure.
1. Check oil level. Add oil if necessary.
2. Start the engine and allow it to warm to normal
operating temperature.
3. Stop the engine.
4. Disconnect wires (Figure 8-2, (1)).
Figure 8-2
Figure 8-2
5. Remove the oil pressure sensor
(Figure 8-2, (2)).
6. Install special tool OEM No. 11 4 050 with
O-ring (Figure 8-3, (1)) in oil pressure sensor
port.
Figure 8-3
Figure 8-3
Note: Special tools OEM No. 13 6 054 and
13 6 051, and O-ring (Figure 8-4, (1))
are used with a DIS Tester.
Figure 8-4
Figure 8-4
7. Connect test pressure gauge (Figure 8-4)
special tool OEM No. 13 3 063 and 13 3 061.
8. Start the engine and read the pressure gauge
at the listed engine speeds.
Results:
• If the mechanical oil pressure test gauge
indicates good oil pressure, replace the faulty oil
pressure sensor or faulty oil pressure gauge.
• If the mechanical oil pressure test gauge
indicates low oil pressure, troubleshoot the
lubrication system to locate the cause of the low
oil pressure. Repair as necessary.
Specifications
000664
3
(1)
(2)
Inspection Item
Test RPM
Specification
Engine Oil
Pressure
4BY2
Idle
0.8 bar (12 psi)
4000 rpm
3.8 to 6.0 bar
(55 to 87 psi)
6BY2
Idle
0.7 bar (10 psi)
4000 rpm
3.8 to 6.0 bar
(55 to 87 psi)