Mercury 565 User Manual

Insufficient Engine Temperature
Possible Cause Remedy
Faulty water thermostat. Replace water thermostat.
Faulty gauge or sender. Test with shop gauge; test sender.
Faulty oil thermostat. Replace.
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.
TROUBLESHOOTING
eng 95

Mercury 565 Specifications

General

Brand	Mercury
Model	565
Category	Engine
Language	English