Repair & maintenance guides

How to Replace the Carpet on a Pontoon Boat

Strip worn pontoon carpet and old glue, check the plywood underneath for rot before it gets covered again, choose between marine carpet, snap-in carpet and vinyl, then glue, trim and finish the new floor so it lasts. Most owners need a few dry weekends; soft or rotten decking is a bigger job.

How to Replace the Water Pump Impeller

Replace the rubber impeller that pumps cooling water through your engine, the part most often behind overheating. On many outboards it is a two-hour driveway job that saves a shop bill of several hundred dollars and prevents far costlier heat damage.

How to Run New Wires Through a Boat (Chase Tubes, Pull Lines and Deck Penetrations)

Get a new transducer cable, light or power wire from the stern to the helm or up through the deck without a fight: use the chase tube and a fish tape or pull string, protect the wire from chafe and heat, support it every 18 inches, seal every penetration and label both ends.

How to Sea Trial Your Boat After Maintenance or Repair

A step-by-step test run after service work: dock checks first (leaks, fluids, steering, kill switch), then a gradual climb through the RPM range while you watch temperature and pressure, a wide-open-throttle check against your engine's spec, shifting and trim tests, and a bilge check afterward. Catch a loose clamp or a missed step at the dock, not miles out.

How to Service Sailboat Winches (Clean, Oil the Pawls, Grease the Gears)

Take your sheet and halyard winches apart, clean out old grease and salt, oil the pawls, lightly grease the gears and bearings, and put them back together. A serviced winch turns easily and, more importantly, its pawls catch every time so the drum can't spin backward under load.

How to Size a House Battery Bank: Load List, Usable Capacity and Charging

Work out how many amp-hours your boat really uses in a day, how much of a battery's rated capacity you can actually use with lead-acid, AGM or lithium, how much reserve to add, and how your charging sources change the answer, so you buy the right house bank the first time.

How to Size, Rig and Inspect Dock Lines and Fenders

Pick the right dock line diameter and fender size for your boat, set up bow, stern and spring lines in a slip, add chafe gear, inspect for wear and UV damage, and double everything up before a storm.

How to Spot and Prevent Corrosion on an Aluminum Boat

Aluminum hulls and pontoon tubes are tough, but they lose almost every fight with other metals. Learn the warning signs of galvanic and stray current corrosion, keep copper and loose metal away from the hull, choose the right anodes, touch up paint with the proper primer and know when a repair needs a welder.

How to Synchronize Twin Engines (RPM and Trim)

Twin engines running at slightly different RPM cause a pulsing drone, extra vibration, uneven wear and wasted fuel. Learn how to sync them by tach, sync gauge or ear, use the one-button sync on digital controls, check that your tachs tell the truth, match trim, and know when uneven engines or cable adjustment are a dealer job.

How to Tell if Your Boat's Flotation Foam Is Waterlogged

Learn the signs that the foam under the floor or seats of a small boat has soaked up water, how to check without tearing the boat apart, what the Coast Guard flotation rules mean for you, and why replacing foam is usually a big job for a pro.

How to Test a Marine Diesel Lift Pump (Feed Pump): Flow Test, Vacuum Gauge and Warning Signs

The lift pump pulls diesel from the tank through the primary filter and feeds the injection pump. When it weakens, the engine starts hard, loses power or dies. Learn how to find it, tell a mechanical pump from an electric one, check it with the priming lever, run a simple flow test into a clear container, read a vacuum gauge on the primary filter, and spot a leaking diaphragm before it fills your oil with fuel.

How to Test and Clean Your Bilge Pump and Float Switch

Make sure your bilge pump actually moves water overboard, both on the manual switch and automatically through the float switch. A working bilge pump is one of the most important safety systems on any boat that stays in the water.

How to Test and Fix Your Boat's Navigation Lights

Learn which navigation lights your boat must show and when, then test them and fix the usual culprits such as corroded sockets, loose pole-light plugs and blown bulbs. Working lights are legally required at night and in poor visibility and are how other boats see which way you are heading.

How to Test and Replace the Engine Thermostat

Find, test and replace the thermostat that controls your engine's operating temperature. A stuck thermostat can make an engine overheat or run too cold. On most outboards and many sterndrives it is a one-hour job with basic tools.

How to Touch Up Paint and Corrosion on an Outboard or Sterndrive

Bare aluminum on a lower unit or sterndrive corrodes fast, especially in salt water. Learn how to find the cause, clean off corrosion, prime and repaint with the right products, and what must never be painted, such as anodes and sensors.

How to Troubleshoot Dash Gauges, a Dead Tachometer or a Wrong Fuel Gauge

Work through dead or wrong dash gauges from the cheapest check to the most involved: fuses and breakers, power and ground, the gauge-versus-sender test, the tachometer's pulse setting and the extra checks for digital network gauges. Most gauge problems turn out to be a bad connection, not a bad gauge.

How to Upgrade Your Boat's Lighting to LED (and Keep Your Nav Lights Legal)

Switch cabin, cockpit and courtesy lights to LED to cut battery drain and bulb changes, choose navigation lights that are actually USCG-certified (not just LED bulbs), check voltage range and dimmers, seal every connection, and run the Coast Guard's simple VHF test to make sure the new lights aren't deafening your radio or AIS.

How to Use a 1-2-Both Battery Switch and Run Two Batteries

Learn what the 1, 2, Both and Off positions really do, a simple routine that keeps one battery ready to start the engine, how to check that both batteries are charging, and when an automatic charging relay makes life easier. Rewiring high-current cables is a job for a marine electrician.

How to Use a Pump-Out Station: Finding One, Hooking Up and Rinsing the Tank

Find a pump-out near you with state maps and free apps, hook up to the deck fitting without spills, rinse the holding tank, leave the station clean for the next boat and know the rules for no-discharge zones and mobile pump-out boats.

How to Use an Oil Extractor Pump for Boat Oil Changes

Change engine oil cleanly through the dipstick tube with a manual or electric extractor: know which engines it suits, warm the oil first, get as much out as you can, then refill to the dipstick, recycle the old oil and clean the pump so it's ready next time.

How to Winterize (and Recommission) Your Boat's Freshwater System

Protect the tank, pump, water heater, faucets and showers from freeze damage with non-toxic antifreeze, then flush and sanitize everything in the spring so the water is clean again. A cracked pump or split fitting is a common, avoidable winter repair bill.

How to Winterize a Gas Inboard Ski or Wake Boat (Direct Drive and V-Drive)

Ski and wake boats with a gasoline inboard (MasterCraft, Malibu, Nautique and similar) have more places to trap water than an outboard: the engine block and manifolds, the heater, the transmission cooler, ballast tanks and the shower. Learn the order of the job, how to protect the fuel and oil, how to drain or fill with antifreeze the way your engine maker says, and the spots owners miss.

How to Winterize a Jet Ski or PWC (Sea-Doo, Yamaha WaveRunner, Kawasaki)

Get your personal watercraft ready for the off-season by flushing and draining the cooling and exhaust system, stabilizing fuel, changing oil, fogging, and storing the battery. Doing it yourself takes an afternoon and helps avoid freeze damage, corrosion and spring no-starts.

How to Winterize a Marine Diesel Inboard (Sailboat or Trawler)

Lay up a marine diesel for winter the way the engine makers describe it, covering fresh oil, a full and treated fuel tank, antifreeze through the raw-water side, the impeller out, the coolant checked, openings plugged and the battery cared for. Freeze damage to a diesel's raw-water circuit is one of the most expensive and most avoidable winter repairs.