Yanmar 6LPA-STP2 Service Manual page 317

Troubleshooting Chart
12/05
Symptom
Low lubrication oil pressure
Engine oil temperature too
high
Fresh water coolant
temperature too high
6LPA Service Manual
Probable Cause
Clogged engine oil filter
Engine oil temperature too high
Failure of oil pump
Faulty operation of oil pump relief valve
Low viscosity of engine oil used
Insufficient engine oil quantity
Faulty pressure gauge or sender unit
Insufficient seawater flow rate
Overloaded operation
Insufficient seawater
Faulty thermostat
Loose drive belt of freshwater pump
Overloaded operation
© 2007 Yanmar Marine International
TROUBLESHOOTING
Measure
Replace
Check the seawater level
Overhaul or replace
Tighten the adjust valve
Replace the safety valve
Replace the engine oil
Add oil
Replace
Replace seawater pump
impeller
Decrease the load
Replace seawater pump
impeller
Replace
Adjust the belt tension
Decrease the load
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