To determine if lubricating oil is diluted with fuel oil or engine coolant is causing low oil pressure, perform the following steps:
1. Acquire a lubricating oil sample from the engine oil pan.
2. Examine the lubricating oil sample for presence of engine coolant or fuel oil.
[a] If coolant or fuel oil are not present, check for a faulty oil pressure gage,
refer to section 2.4.
[b] If water or fuel oil are present, refer to section 2.3.1.
Contaminated Lubricating Oil Resolution
Perform the following steps to resolve contaminated lubricating oil:
1. Drain engine oil pan, refer to appropriate service manual, preventive maintenance chapter.
2. Refill engine crankcase with new oil; refer to appropriate service manual, preventive
3. Verify lubricating oil replacement; refer to section 126.96.36.199.
Test Replaced Lubricating Oil
Perform the following steps to determine if replaced lubricating oil resolved low oil pressure:
1. Connect to DDDL 7.0.
2. Start and run the engine speed at 1800 rpm.
3. Visually examine DDDL 7.0 for oil pressure reading.
[a] If DDDL 7.0 indicates oil pressure greater than or equal 241 kPa (35 psi) at 1800 rpm, shut down the engine and disconnect DDDL 7.0. Refer to section 2.13 to determine the cause for the diluted oil.
[b] If DDDL 7.0 indicates oil pressure less than 241 kPa (35 psi) at 1800 rpm, shut down the engine and disconnect DDDL 7.0. Check for faulty oil pressure gage; refer to section 2.4.