TROUBLESHOOTING
eng
131
High Engine Temperature
Possible Cause
Remedy
Seacock closed.
Open.
Serpentine belt loose or in poor condition. Replace or adjust belt.
Insufficient coolant in closed cooling
system.
Add coolant and check for leaks.
Recirculating pump defective.
Replace.
Seawater pickups obstructed.
Inspect.
Faulty thermostat.
Replace.
Oil cooler cores plugged with foreign
material.
Clean cooler cores.
Faulty seawater pickup pump.
Repair.
Seawater discharge restricted or plugged. Clean exhaust elbows.
Faulty gauges or senders.
Test with shop gauges; test
senders.
Aerated water supply to water pick‑up.
Place water pick‑up in a
non‑aerated water supply.
Low Engine Oil Pressure
Possible Cause
Remedy
Insufficient oil in system.
Check and add oil.
Excessive oil in system
(causing it to become aerated).
Check and bring oil to required level.
Check for cause of excessive oil (improper
filling, defective fuel pump, etc.).
Diluted or improper viscosity oil.
Change oil and oil filter, using correct
grade and viscosity oil. Determine cause
for dilution (excessive idling, faulty fuel
pump, etc.).
Faulty gauge or sender.
Test with mechanical shop gauge; test
sender.
Excessive oil temperature.
Faulty oil thermostat.
Engine mechanical: oil pump,
excessive bearing clearance,
etc.
Repair as necessary.
Summary of Contents for HP565
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