TROUBLESHOOTING
123
Engine Coolant Temperature Too High
Possible Cause Remedy
Seacock closed. Open.
Serpentine belt loose or in poor condition. Replace or adjust belt.
Recirculating pump defective. Replace.
Seawater pickups obstructed. Inspect.
Faulty thermostat. Replace.
Oil cooler cores plugged with foreign
material.
Clean cooler cores.
Heat exchanger restricted. Backflush.
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.
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