DIAGNOSING LUBRICATION SYSTEM
LOW OIL PRESSURE:
Low oil level.
Clogged cooler or filter.
Excessive oil temperature.
Oil pressure regulating valve failure.
Excessive main or rod bearing clearance.
Clogged oil pump screen.
Excessive clearance between oil pump gears and
· Piston cooling orifice not installed.
HIGH OIL PRESSURE:
· Improper oil classification.
· Clogged oil lines.
· Oil pressure regulating valve failure.
OIL SLUDGE AND DILUTION:
Improper operation and servicing.
Coolant leakage into lubrication system.
Excessive oil consumption.
Defective injection pump (failed internal O-ring seals).
LOW OIL PRESSURE AT SLOW IDLE:
· Bypass oil check valve failure.