Discovery I (LJ) V8-3.9L (1994)
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Engine Oil Pressure: Testing and Inspection
Engine Oil Pressure Test
WARNING:
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Use suitable exhaust extraction equipment, if test is being carried out in workshop.
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If vehicle has been running, engine oil will be hot, care must be taken when fitting equipment to prevent personal injury due to scalding.
SERVICE TOOLS
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LRT-12-052: Pressure test equipment
TEST
1. Check lubricant is to correct level.
2. Place vehicle on a ramp (hoist).
3. Disconnect battery negative lead. Remove oil pressure switch.
4. Fit the test gauge.
5. Reconnect battery negative lead.
6. Start and run engine to normal operating temperature.
7. At a steady engine speed of 2500 rpm, engine oil pressure reading should be 2.75 bar (40 psi).
8. If the pressure is low, remove and overhaul oil pump.
