300Tdi Defender
12
ENGINE
2
REPAIR
ENGINE OIL PRESSURE TEST
Service repair no - 12.90.09/01
WARNING: Use suitable exhaust
extraction equipment if an engine test is
being carried out in a workshop.
WARNING: If vehicle has been running,
engine wil be hot; care must be taken
when fitting test equipment to prevent
personal injury.
1. Check that engine lubricant is to correct level.
2. Remove oil pressure switch .
3. Connect pressure test gauge LRT-12-052A, as
shown.
4. Start and run engine to normal operating
temperature.
5. With engine running at idle check oil pressure,
which should read 1.76 bar (25.87 lbf/in
2
).
6. If pressure is low it can be caused by the
following:-
Thin or diluted oil.
Low oil in sump.
Choked oil strainer.
Faulty oil pressure relief valve.
Excessively worn or damaged oil pump
displacement gears.
Excessive crankshaft bearing clearance.
7. If excessive pressure is indicated it can be
caused by :-
Overfilling engine with lubricant.
Sticking oil pressure relief valve.
Blockage in breather system.
