A Series Diesel Engine Lubricating System Flow 116
Diagnosing Lubricating System
Malfunctions
Be sure to check items related to oil pressure, such as:
gauges, high and low oil level, excessive oil
contamination, oil viscosity, etc.
High Oil Pressure
High oil pressure usually occurs after the engine is first
started in cold weather. The lubrication system does
not have a cold start relief valve. The pressure
regulating valve components are machined to a size
that will relieve the excessive pressure created by cold
engine oil.
Oil Pressure Regulating Valve
The engine will have high oil pressure if the regulator
sticks in the closed position. Check the regulator for
freedom of movement.
Low Oil Pressure
Low oil pressure can be caused by several lubrication
system related malfunctions. To begin the
investigation, determine the engine operating
conditions when the low pressure was first observed.
Oil Level
Low oil level can cause low oil pressure.
Caution: Never operate the engine with the oil level
below the low (L) mark.
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