Service Manual

Lubricating Oil Contamination ISB, ISBe and QSB (Common Rail [...]
Page 7-44 Section 7 - Lubricating Oil System - Group 07
To buy Cummins Parts and Service Manuals, Training Guides, or Tools go to our website at https://store.cummins.com
Shut off the engine. Wait approximately 5 minutes to let
the oil drain from the upper parts of the engine. Check the
level again.
Add oil as necessary to bring the oil level to the H (high)
mark on the dipstick.
Lubricating Oil Contamination
(007-044)
General Information
Lubricating Oil Dilution
CAUTION
Diluted oil can cause severe engine damage.
Check the condition of the lubricating oil.
• Thin, black lubricating oil is an indication of fuel in the
oil.
• Milky discoloration is an indication of coolant in the
lubricating oil.
Coolant in the oil can be caused by:
• Expansion plugs leaking
• Lubricating oil cooler element leaking
• Damaged cylinder head or gasket
• Cracked engine block
• Casting porosity.
Coolant-Diluted Lubricating Oil
Since the lubricating oil cooler design does not require
gaskets or seals to maintain the separation of oil and
coolant, the element itself must leak to allow mixing of the
fluids.Refer to Procedure 007-003 in Section 7.