Checking Engine Oil Pressure; Trochoid Oil Pump; Oil Pump Components; Troubleshooting - Yanmar 2TNV70 Service Manual

Checking Engine Oil Pressure

CHECKING ENGINE OIL
PRESSURE
Perform an engine oil pressure check if there is any
indication of low oil pressure such as the oil
pressure indicator is on or the oil pressure gauge
indicates low oil pressure. See Engine Oil Pressure
on page 9-4 for the engine oil pressure
specification.
1. Disconnect the wire lead from the oil pressure
switch or sending unit (Figure 9-2, (1)).
(1)
Figure 9-2
2. Remove the oil pressure switch.
3. Install a mechanical oil pressure gauge in the
oil pressure switch port.
4. Start the engine:
• If the mechanical oil pressure test gauge
indicates good oil pressure, replace the faulty
oil pressure switch or sending unit or faulty
machine oil pressure gauge in instrument
panel.
• If the mechanical oil pressure test gauge
indicates low oil pressure, troubleshoot the
lubrication system to locate the cause of the
low oil pressure. See Troubleshooting Charts
on page 13-7. Repair as necessary.
TNV IDI Service Manual

TROCHOID OIL PUMP

Oil Pump Components

(3)
1 – Crankshaft
2 – Oil Pump Cover
3 – Oil Pressure Regulator
4 – Gear Case Cover
5 – Outer Rotor
6 – Inner Rotor
0000020A
LUBRICATION SYSTEM
(1)
(2)
(5)
(6)
(4)
Figure 9-3
0001955A
9-7