MBE 4000 DDEC VI Troubleshooting – Section 15.6 Restricted Oil Cooler Element

Section 15.6
Restricted Oil Cooler Element

To determine if a restricted oil cooler element is causing low oil pressure, perform the following steps:‪

PERSONAL INJURY ‪
To avoid injury before starting and running the engine, ensure the vehicle is parked on a level surface, parking brake is set, and the wheels are blocked.‪

1. Start and run the engine at rated speed.
2. Run the engine at rated speed with a no-load condition for approximately five minutes, allowing the engine coolant to reach normal operating range 88-96°C (190-205°F).
   1. If the oil temperature sensor is indicating a lubricating oil temperature less than or equal to 110°C (230°F), shut down the engine and check for a defective oil filter bypass valve; refer to "15.7 Defective Oil Filter Bypass Valve" .
   2. If the oil temperature sensor is indicating a lubricating oil temperature greater than 110°C (230°F), shut down the engine and repair oil cooler element; refer to "15.6.1 Oil Cooler Element Inspection" .

Section 15.6.1
Oil Cooler Element Inspection

Perform the following steps to repair the oil cooler element:‪

1. Remove the oil cooler element; refer to MBE 4000 Service Manual (6SE420), Chapter 3, “Lubrication System Oil Cooler/Filter Housing”.
2. Clean the oil cooler element before sludge hardens. Flush oil passages with clean, hot water.
3. Inspect the oil cooler element for damage and replace if necessary.
4. Install oil cooler element; refer to MBE 4000 Service Manual (6SE420), Chapter 3, “Lubrication System — Oil Cooler”.
5. Verify repair of oil cooler element; refer to "15.6.1.1 Test Engine with Replaced Oil Cooler Element" .

Section 15.6.1.1
Test Engine with Replaced Oil Cooler Element

Perform the following steps to determine if replaced oil cooler element resolved low oil pressure:‪

PERSONAL INJURY ‪
To avoid injury before starting and running the engine, ensure the vehicle is parked on a level surface, parking brake is set, and the wheels are blocked.‪

1. Start and run the engine at rated speed.
2. Run the engine through its operating range with no-load condition for approximately five minutes, allowing the engine coolant to reach normal operating range, 88-96°C (190-205°F).
   1. If the DDR indicates 241 kPa (35 psi) or more at rated speed, shut down the engine and disconnect the DDR. No further troubleshooting is required.
   2. If the DDR indicates less than 241 kPa (35 psi) at rated speed, shut down the engine and disconnect the DDR. Check for defective oil filter bypass valve; refer to "15.7 Defective Oil Filter Bypass Valve" .