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4. LUBRICATION SYSTEM MXU 500 IRS
TROUBLESHOOTING
Oil level low High oil pressure
· Oil consumption · Pressure relief valve stuck closed
· External oil leak · Plugged oil filter, gallery, or metering orifice
· Worn piston ring · Faulty oil pump
· Incorrect piston ring installation
· Worn valve guide or seal Seized engine
· No or low oil pressure
Oil contamination (White appearance) · Clogged oil orifice/passage
· From coolant mixing with oil · Internal oil leak
Faulty water pump mechanical seal · Non-recommended oil used
Faulty head gasket
Water leak in crankcase Oil contamination
· Deteriorated oil
No oil pressure · Faulty oil filter
· Oil level too low · Worn piston ring (White appearance with water or
· Oil pump drive chain broken moisture)
· Oil pump drive sprocket broken Damaged water pump mechanical seal
· Oil pump damaged (pump shaft) Damaged head gasket
· Internal oil leak Oil relief not frequent enough
Low oil pressure
· Pressure relief valve stuck open
· Clogged oil filter and strainer screen
· Oil pump worn or damaged
· Internal oil leak
· Incorrect oil being used
· Oil level too low
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