Lubricating Oil Diluted With Fuel Oil or Engine Coolant
To determine if lubricating oil is diluted with fuel oil or engine coolant is causing low oil pressure, perform the following:
- Acquire a lubricating oil sample from the engine oil pan.
- Visually examine lubricating oil sample for presence of engine coolant or fuel oil.
- If coolant or fuel oil are not present, check for a faulty oil pressure gage sensor, refer to "26.4 Faulty Oil Pressure Gage Sensor" .
- If water or fuel oil are present, refer to "26.3.1 Contaminated Lubricating Oil Resolution" .
Note: Blockage of the engine water pump weep hole can allow coolant that has leaked past a faulty water pump oil seal to enter the lubricating oil. Inspect the weep hole for blockage.
Contaminated Lubricating Oil Resolution
Perform the following steps to resolve contaminated lubricating oil:
- Drain engine oil pan, refer to "13.5.1 Lubricating Oil" .
- Refill engine crankcase with new oil; refer to "13.5.1 Lubricating Oil" .
- Verify lubricating oil replacement; refer to "126.96.36.199 Test Replaced Lubricating Oil" .
Test Replaced Lubricating Oil
Perform the following to determine if replaced lubricating oil resolved low oil pressure:
- Install the Diagnostic Data Reader to the vehicles Display Data Line Adaptor, see Figure "Typical Display Data Line Adaptor" ; refer to OEM guidelines.
- Start and run the engine speed at 1800 r/min.
- Visually examine the DDR for oil pressure reading.
- If the DDR indicates oil pressure greater than 241 kPa (35 lb/in.2 ), at 1800 r/min, shut down the engine and disconnect the DDR. No further troubleshooting is required.
- If the DDR indicates oil pressure less than 241 kPa (35 lb/in.2 ), at 1800 r/min, shut down the engine and disconnect the DDR. Check for faulty oil pressure gage sensor; refer to "26.4 Faulty Oil Pressure Gage Sensor" .
|Series 50 Service Manual - 6SE50|
|Generated on 10-13-2008|