Poor Performance
Possible Cause Remedy
Throttle not fully open.
Inspect throttle cable and linkages for
proper operation.
Damaged or wrong propeller. Replace propeller.
Excessive bilge water. Drain and check for cause of entry.
Boat overloaded or load
improperly distributed.
Reduce load or redistribute load more
evenly.
Boat bottom fouled or damaged. Clean or repair as necessary.
Flame arrestor dirty. Change or clean flame arrestor.
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
106 eng
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