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The lower unit, also called the gearcase, is the bottom section of an outboard that sits partially underwater and connects the engine's power to the propeller. When the engine runs, power travels down the driveshaft into the lower unit. Inside the gearcase, gears redirect that rotation to the propshaft, which turns the propeller. In simple terms: Engine → Driveshaft → Gearcase → Propshaft → Propeller But transferring power isn't the lower unit's only job. What's Inside an Ou …

Trim tabs are one of those things a lot of boat owners have heard of, but not everyone fully understands. Once you know what they do, it makes a lot more sense why so many boats have them. At a basic level, trim tabs help control how your boat rides in the water. They Help Your Boat Get on Plane Faster Trim tabs push the stern up and bring the bow down. That helps your boat get on plane quicker, especially if you have a heavy load or passengers. If your boat struggles to plane or feels like it …

Routine maintenance is one of the best ways to protect your Mercury outboard, but figuring out which parts you need can quickly become confusing. Different engines require different filters, seals, spark plugs, and service components, making it easy to order the wrong parts. That's where OEM Mercury maintenance kits come in. Designed specifically for your engine, these kits bundle the most commonly replaced service items into one convenient package, helping take the guesswork out of annual and 1 …

Hard Starting Problems: Common Outboard Parts to Check If your outboard is slow to start or takes a few tries before it fires up, something is off. It might seem random, but most starting issues come down to a handful of common parts. Before you assume the worst, here are the first things to check Start with the Battery A weak or aging battery is one of the most common causes of hard starting. Even if it turns over, it may not have enough power to fire the engine cleanly. Check for: Slow cranki …

When you’re using your boat regularly, small issues can turn into big problems fast. In Florida, heat, salt, and frequent use all add extra wear on your engine and components. A few simple checks throughout the season can help you avoid downtime and keep your boat running the way it should. 1. Keep an Eye on Your Water Flow That steady stream from your outboard tells you your cooling system is working. If it looks weak or inconsistent, it could be an early sign of a blockage or worn impel …