Free Marine Diesel Course for Boat Owners
My free Marine Diesel Course explains how small to medium marine diesel engines work, how to maintain them and how to investigate operating problems. It combines explanations of engine systems with practical tasks you can undertake on your own engine, following its manufacturer’s instructions. The aim is to help you understand what you are looking at, recognise changes in engine performance and carry out routine maintenance with a clear understanding of the work involved.
I have spent much of my maritime career at sea as a marine engineer and commissioning marine diesel engines aboard offshore oil and commercial vessels. I have also owned, refitted and cruised several boats, dealing with the maintenance problems and installation faults that most boat owners encounter. Engines still develop faults, and learning continues regardless of experience. This course draws on that work and the diesel engine material in my book, The Marine Electrical and Electronics Bible, Fourth Edition.
Free Marine Diesel Course - Why
Learn About Your Engine?
A sailboat’s engine is needed for more than leaving and entering a marina. It may be required to maintain control in confined water, work against a current, charge batteries or reach shelter when sailing is no longer practical. Its reliability depends on the condition of the complete installation, including fuel supply, cooling, exhaust, lubrication and starting systems.
Understanding these systems helps you identify problems before they cause a breakdown. A small coolant leak, deteriorating hose, restricted fuel filter or loose electrical connection can become a loss of propulsion. Recognising the significance of these faults allows you to deal with them while the boat is secure and access to parts and assistance is available.
Who is the Free Marine Diesel Course For?
The course is written for boat owners, liveaboards and cruising sailors who want to understand and maintain their engines. You can begin without previous mechanical training. The opening material explains operating principles and component functions before moving into servicing and fault diagnosis.
Owners who already carry out their own maintenance can use the course to examine systems they have not previously worked on or investigate recurring problems. It is also useful when discussing repairs with a mechanic. Describing the symptoms, operating conditions and checks already completed gives the person investigating the fault a more useful starting point.
Understand How a
Diesel Works
The course begins with the four-stroke cycle and the relationship between air, compression, fuel injection and combustion. Understanding this sequence explains why an engine needs adequate cranking speed, an unrestricted air supply, correctly delivered fuel and sufficient compression to start and run.
Engine construction follows, covering the block, cylinder head, pistons, valves, crankshaft, camshaft and bearings. These components are considered in relation to their function rather than as a collection of names. Engine mounts and the surrounding installation are also included because vibration, movement and access affect both operation and maintenance.
Free Marine Diesel Course - Follow
the Engine Systems
The systems material explains how fuel reaches the engine, how it is filtered and injected, and how unused fuel returns to the tank. It covers contamination, water separation, lift pumps, injection equipment and the problems caused by restrictions or air entering the supply.
Lubrication, cooling, air intake, exhaust and electrical systems are covered in the same way. You will learn what each system does, which components require attention and how a fault in one area can affect another. Cooling and wet exhaust arrangements receive particular attention because reduced seawater flow, exhaust restrictions and water entering the engine can cause damage.
Free Marine Diesel Course -
Perform Routine Maintenance
Routine maintenance begins with knowing the correct procedure, specification and service interval for your engine. The course explains daily checks and scheduled work, including oil and filter changes, fuel filtration, belt inspection, hose condition and raw-water pump servicing.
The practical emphasis is on completing the whole task. Changing a filter also involves checking seals, restoring the system to service and checking for leaks. Replacing an impeller includes inspecting the removed parts and investigating missing vanes. Maintenance is complete when the system has been checked in operation and the work recorded.
Free Marine Diesel Course - Diagnose
Problems Methodically
Fault diagnosis starts with establishing what the engine is doing and the conditions under which the problem occurs. An engine that will not crank requires a different investigation from one that cranks normally but will not fire. An engine that loses power under load presents another set of questions.
The course develops this approach through starting faults, rough running, smoke, fuel starvation, overheating and electrical problems. Gauge readings, alarms, exhaust appearance, noise and vibration provide evidence, but individual symptoms rarely establish the cause on their own. The objective is to test a likely explanation rather than replace components without confirming why they have failed.
Your Complete
Onboard Repair Resource
Why not get a copy of my book The Marine Electrical and Electronics Bible 4th Edition. In Australia, New Zealand or Asia/Pacific order a copy through Boat Books, UK and European and Mediterranean based boats can Order Here. For US, Canadian and Caribbean based boats can get the US Edition here or at Amazon. Marine systems are my profession so let me help you.
Free Marine Diesel Course - Learn on Your Own Engine
Practical work starts with identifying the components and tracing the systems aboard your boat. Locate the fuel shut-off, filters, seawater inlet, strainer, oil dipstick, coolant filling point and engine stop mechanism. Establish how to reach them and what must be isolated before work begins.
Servicing tasks then connect the theory to the installation you operate. Use the engine manual for fluid specifications, tightening torques, adjustment limits and model-specific procedures. Some work requires specialist equipment or skills, particularly injection equipment servicing and internal repairs. Understanding the task includes recognising when it should be referred to a specialist.
Free Marine Diesel Course - Respond
to Faults and Keep Records
The course also covers responses to overheating, loss of oil pressure, leaks and seawater ingress, together with shutdown arrangements and engine preservation. These subjects need to be understood before a fault occurs, when there is time to identify controls and consider the consequences of stopping or continuing to run.
Maintenance records support that work. Engine hours, service dates, replacement parts, fluid use and operating observations help reveal developing trends. A record of increasing oil consumption or repeated coolant loss is more useful than trying to recall when it first became noticeable.
Free Marine Diesel Course - Start
the Course
The Marine Diesel Engine Course hub contains the full syllabus and links to the individual lessons. It takes you through operating principles, construction and systems, routine maintenance, troubleshooting, practical work, emergency response, preservation and record-keeping.
Begin with the fundamentals if diesel engines are unfamiliar, then work through the systems on your own boat. Return to the relevant lessons before undertaking maintenance or investigating a fault. The course is free, and the material can also be used as a reference alongside your engine manual.
Free Marine Diesel Course
Free Marine Diesel Course. Understanding your engine helps you maintain it, recognise faults and make informed decisions when its operation changes. Carrying out appropriate routine work yourself can reduce servicing costs, while identifying developing problems may prevent more expensive repairs. The course connects operating principles with the equipment installed aboard your boat and the work needed to keep it serviceable. Start with the Marine Diesel Engine Course hub and build your knowledge around your own engine. Free Marine Diesel Course for all you need or want to know.