Marine Diesel Engines
Maintenance, cooling systems and troubleshooting. Explore step-by-step checklists, practical tips and important precautions before you work on your boat.
Guides in this topic
Choose a guide to read the full steps.
How to Check a Marine Diesel Engine Before Departure
A repeatable visual check for oil, coolant, belts, leaks and the raw-water exhaust.
Read the guideHow to Troubleshoot an Overheating Marine Diesel
Identify the safest first checks when an engine temperature alarm sounds.
Read the guideWhy Is My Marine Diesel Smoking Under Load?
Separate overload and airflow problems from normal brief exhaust changes.
Read the guideHow to Inspect a Marine Diesel Fuel Filter
Spot contamination and fuel-supply clues before a clogged filter leaves you without propulsion.
Read the guideHow to Inspect a Raw-Water Pump Impeller
Recognize wear and maintenance needs in a marine engine cooling pump.
Read the guideWhy a Marine Diesel Starts and Then Stalls
A practical observation checklist for fuel, air and engine shutdown clues.
Read the guideHow to Recognize Exhaust Elbow Problems on a Marine Diesel
Find symptoms of restriction, leaks or corrosion around a water-injected exhaust elbow.
Read the guideHow to Investigate Black Diesel Smoke Under Load
Separate load, airflow, propeller and exhaust clues when black smoke appears.
Read the guideHow to Recognize Air in a Marine Diesel Fuel System
What to check when an engine is difficult to start just after a filter service.
Read the guideHow to Spot Water Contamination in Marine Diesel Fuel
Recognize common signs of water and biological contamination in the fuel system.
Read the guideWhy Does a Sailboat Diesel Vibrate More Under Power?
Build a symptom record that distinguishes propeller load from engine mounting and shaft issues.
Read the guideHow to Inspect Marine Engine Coolant Hoses Safely
Recognize cooling-hose aging before it causes coolant loss or overheating.
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