15. Oil Aeration Test

15. Oil Aeration Test

Purpose:

The purpose of this test is to determine if the engine lube oil is aerated and causing poor idle quality.

Oil Aeration Test

^ Run engine at 3000 RPM for 1 minute.
^ Take an oil sample from the engine oil temperature (EOT) sensor port at idle.
^ Inspect the sample for presence of air bubbles.






^ Excessive oil aeration can be caused by depleted oil additives pick-up tube leak front cover seal leak or upper pan seal leak.

Recommended Procedure:

Note: The engine must be at operating temperature.

1. Remove the EOT sensor. For additional information, refer to Electronic Engine Controls.
2. Install the High Pressure Pump Test Adapter 303-765 or equivalent and Gauge 0-1100 kpa (0-160 psi) Bar 014-00761 or equivalent.
3. Increase the engine speed to 3000 RPM and maintain for 1 minute.
4. Return the engine speed to idle.
5. Obtain an oil sample with the engine at idle.

Possible Causes:

^ Extended oil drain intervals the anti-foam additives in the oil may be depleted from severe use or extended intervals.
^ Air may be present due to recent engine repair on injection control pressure system. It may be necessary to operate the vehicle aggressively for 24-32 kilometers (15-20 miles) to remove excess air.
^ Incorrect type or grade of oil.


Tools Required:

^ Clear container approximately 0.95L (1-quart)
^ Gauge 0-1100 kPa (0-160 psi) Bar 014-00761 or equivalent
^ High Pressure Pump Test Adapter 303-765 or equivalent