Oil Pressure Diagnostics - Daewoo G424 Gasoline Service Manual

Oil Pressure Diagnostics

The following table contains important information for the checking of oil pressure.
Condition
1. Measuring oil pressure.
2. Check engine oil level.
3. Oil level in crankcase
above "MAX" mark.
4. Oil level in crankcase
5. Change in oil pressure.
6. Low engine oil pressure
7. Engine-to-engine variance.
G424 Service Manual
Information
Use a good automotive oil pressure test gauge. Do not rely on the oil
pressure gauge in the instrument panel.
Oil level should be between the "MIN" and "MAX" marks.
May cause loss of engine speed, oil pressure gauge
fluctuation, drop in oil pressure and hydraulic valve lifter noise at high RPM.
Low oil pressure, oil pressure gauge fluctuation, internal below at or below
"MIN" mark. engine noise and/or damage.
This may be a normal condition. Oil pressure may read high in the cooler
times of the day and when engine is not up to operating temperature. As
the air temperature warms up and the engine is running at normal operating
temperature, it is normal for oil pressure to drop off slightly.
With modern engines and engine oils, low oil pressure readings at idle or
high rpm do not necessarily mean there is a problem. If valve lifters do not
"clatter" (at idle), there is a sufficient volume of oil to lubricate all internal
moving parts properly. The reason for the drop in oil pressure is that engine
heat causes an expansion of the internal tolerances in the engine and, the
oil will thin out somewhat from heat.
It is not uncommon to see different oil pressure readings between like
engines, as long as they fall within specifications. Differences in oil
pressure can be attributed to differences in engine tolerances, gauges,
wiring, senders, etc.
176 Adjustment and Troubleshooting