A Series Diesel Engine Lubricating System Flow 118
Incorrect Oil Pump
If low or high pressure occurs after changing the
pump, verify that the correct pump was used.
Oil Dilution
Caution: Diluted oil can cause severe engine damage.
Check the condition of the oil
z Thin, black oil is an indication of fuel in the
oil.
z Milky discoloration is an indication of coolant
in the oil.
Coolant in the oil can be caused by
z Cup plugs leaking.
z Damaged cylinder head gasket.
z Oil cooler element leaking.
Coolant Diluted Oil
Coolant leaking from the oil cup plugs in the cylinder
block water jacket will dilute the oil.
To check for leaks, remove the tappet cover and
pressurize the cooling system.
Coolant in the oil can also be caused by a damaged
cylinder head gasket.
Pressurize the cooling system to check for leaks. It
may be necessary to remove the oil pan to locate
internal leaks.
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