MBE 4000 DDEC VI Troubleshooting – Section 15.2 Improper Lubricating Oil Viscosity

Section 15.2
Improper Lubricating Oil Viscosity

To determine if improper lubricating oil viscosity is causing low oil pressure, perform the following steps:‪

1. Acquire a lubricating oil sample from the engine oil pan.
2. Submit oil sample for an ASTM test analysis.
   1. If engine oil sample meets ASTM specifications, check to determine if lubricating oil is diluted with fuel or coolant; refer to "15.3 Lubricating Oil Diluted With Fuel or Engine Coolant" .
   2. If engine oil sample did not meet ASTM specifications,refer to "15.2.1 Lubricating Oil Replacement" and Detroit Diesel publication Lubricating Oil, Fuel, and Filters (7SE270).

Section 15.2.1
Lubricating Oil Replacement

Perform the following steps to replace engine oil:‪

1. Drain and refill engine with new lubricating oil. Engine oil capacities are listed in Table "Lubricating Oil Capacity" .
2. Verify lubricating oil replacement; refer to "15.2.1.1 Test Engine with Replaced Lubricating Oil" .

Section 15.2.1.1
Test Engine with Replaced Lubricating Oil

Perform the following steps to determine if replaced lubricating oil 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 engine at rated speed.
2. Measure engine oil pressure.
   1. If the oil pressure is 241 kPa (35 psi) or more, no further troubleshooting is required. Shut down the engine.
   2. If the oil pressure at rated speed is less than 241 kPa (35 psi), shut down the engine. Check the lubricating oil for fuel and engine coolant dilution; refer to "15.3 Lubricating Oil Diluted With Fuel or Engine Coolant" .