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Writer's pictureFelicia Lambert

100-hour Engine Services Explained

Updated: Oct 31


Outboard Engine | 100 Hour Service | The Mobile Mariner | Jensen Beach | Florida


Commonly used in many boats, inboard engines require routine maintenance to ensure they perform efficiently and safely. Forgetting your annual service can lead to costly repairs or even unexpected engine failure while you're out cruising on the water. Whether you’re a recreational boater or a commercial operator, your 100-hour service is essential for avoiding breakdowns and maintaining optimal performance.

In today's article, we will explain the 100-hour service and what your engine receives.


What’s Included in Your 100-Hour Service:


Oil and Filter Change


One of the most important tasks during your 100-hour service is changing the engine oil and replacing the oil filter. Fresh oil keeps engine parts lubricated and reduces friction, ensuring the engine runs smoothly and efficiently.


By replacing your oil, filters, and gaskets, you can ensure that your engine operates smoothly. We also recommend replacing your fuel water separator during your 100-hour service.


Cooling System Check

Your cooling system also requires thorough flushing to eliminate salt and debris, which is essential for preventing overheating. This crucial service involves inspecting the hoses and replacing the impeller.


Belt and Hose Inspection


During your 100-hour service, we also check your belts and hoses of the inboard engine. These parts are essential for the engine's performance, ensuring that the water pump, alternator, and cooling system work properly. Over time, your belts and hoses can wear down due to constant use, heat exposure, and Florida's harsh marine environment. Routine belt and hose inspections during your 100-hour service help find any signs of wear, cracks, or looseness early.

This allows us to fix any issues before they can become any worse.


Transmission and Gearcase Service


Your transmission and gearcase fluids are essential for the proper functioning of your engine, ensuring smooth shifting and protecting internal components from wear and tear. Regularly checking and changing the transmission fluid helps keep the gears and bearings in the transmission system working smoothly. This prevents friction and heat buildup, maintaining optimal performance and extending the lifespan of these important components.


Electrical System Check


Your 100-hour service also involves checking the electrical system. Your battery, alternator, and starter motor are inspected to ensure the engine starts reliably, and your wiring is examined for corrosion or damage. We will carefully check your battery to make sure it's working well. We'll also examine the alternator to ensure it's charging the battery properly and keeping the electrical system stable. Additionally, we'll inspect the starter motor to make sure it works reliably to start the engine.



Why Your 100-Hour Service Matters


Ensuring you have your annual 100-hour service is important to keep your engine running strong. By following your annual maintenance schedule, you can nip any small issues in the bud. Not only does this help extend your engine's life, but it also gives you peace of mind when you're on the water. Your 100-hour service helps keep your boat running smoothly, uses fuel more efficiently, and helps keep you safe on the water.


Instead of waiting for problems to show up, it's best to schedule regular 100-hour inspections to keep your engine in great condition.



100-hour Engine Service | The Mobile Mariner | Jensen Beach | Florida

The Mobile Mariner is committed to providing quality boat maintenance and repair service right at your home, dock, or slip. We troubleshoot the problem on the spot and work both diligently and efficiently to provide you with a solution. Our focus is to provide quality service, customer satisfaction, and the peace of mind you deserve.




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