BoatMend

Repair & maintenance guides

Plain-English, step by step, written for owners. Pick your engine to see the guides that apply to it.

378 of 509 guides · page 12 of 16

Buying & ownershipModerate

Marina and Storage Liens: How Lien Sales Work, Buying a Lien-Sale Boat, and Not Losing Yours

How unpaid slip, storage or repair bills turn into a lien and then a sale, using Florida and California as examples; what an owner can do to stop it; and how a buyer checks that a lien-sale or abandoned boat comes with paperwork the state will actually title. Every state has its own process and deadlines, so confirm with your state agency.

2 h All engines
Buying & ownershipEasy

Marina Slip and Storage Contracts: What to Read Before You Sign

Walk through a slip, mooring or winter storage contract clause by clause: insurance and additional-insured requirements, hold-harmless and waiver-of-subrogation language, liveaboard and work rules, DIY and outside-contractor limits, storms, termination, refunds and lien rights, plus the questions to ask the marina and your insurer. Practical guidance, not legal advice.

1 h All engines
ElectricalEasy

Marine Battery Care: Test, Charge and Store for Winter

Check your boat battery's health, charge it the right way for its type (flooded, AGM or lithium), and store it so it is ready in spring. Most "boat won't start" calls start with a neglected battery.

1 h All engines Shop: $50-150
Hull & systemsEasy

Marine Head and Holding Tank Care: Odors, Clogs, Pump-Outs and Winterizing

Keep your boat's toilet and holding tank working and odor-free, clear common clogs, pump out the right way, and winterize the system. Also covers the Y-valve and the federal no-discharge rules every owner with a head needs to follow.

1 h All engines Shop: $150-600
Hull & systemsEasy

Marine Sealants Explained: 5200, 4200, 4000UV, Polysulfide, Silicone and Butyl Tape

Pick the right sealant before you bed a cleat, a through-hull, a window or a transducer. The wrong goo either leaks in a year or glues a part on so hard you damage the boat getting it off.

30 min All engines
TroubleshootingModerate

Marine Stereo Troubleshooting: No Power, Lost Settings, No Sound or Bluetooth Trouble

Track down a boat stereo that won't turn on, forgets its presets, resets when the engine cranks, plays no sound or won't keep a Bluetooth connection. Work from the free checks (switches, resets, fuses) to voltage tests, speaker wiring, water damage and software updates before you buy a new unit.

1 h All engines Shop: $100-350
Hull & systemsEasyDraft

Marine Vinyl Stain Removal: Ink, Sunscreen, Grease, Mildew and Pink Stain

A stain-by-stain plan for boat seat vinyl that follows your vinyl maker's own cleaning list, starts with the mildest method, and keeps you away from the products that strip the protective top coat, rot the stitching or crack the vinyl.

1 h All engines Shop: $100-400
TroubleshootingModerate

Milky Engine Oil or Water in the Oil - What It Means and What to Do

Milky, creamy or rising engine oil usually means water is getting into the engine. Learn why you should stop running it right away, how to tell harmless condensation from a real leak, and which parts are the usual suspects: head gaskets, exhaust risers and manifolds, intake manifold gaskets, oil coolers and freeze cracks.

1 h Outboard, Sterndrive (I/O), Gas inboard, Marine diesel
SafetyEasy

Missing or Faded Capacity Plate: How to Read It and Get a Proper Replacement

The capacity plate tells you how many people, how much weight and how much horsepower your boat can safely handle. Learn what each line means, which boats must have one under 33 CFR 183, how to order a replacement from the builder, what to do if the builder is gone, and why homemade numbers are a bad idea.

30 min All engines
Hull & systemsModerate

Mounting Hardware Where You Can't Reach Behind: Blind Fasteners

Learn how to mount light accessories on a boat when you can't get a hand behind the panel, using blind rivets, rivet nuts, well nuts, toggle anchors and bonded studs, when to cut an inspection port instead, and what must never be held by a blind fastener.

1 h 30 min All engines Shop: $100-400
Routine serviceEasy

Moving Your Boat From Fresh to Salt Water (or Back): Anodes, Flushing, Corrosion, Bottom Paint and Trailer Upgrades

What to change when a lake boat moves to the coast, or a saltwater boat moves inland: switching anode material, a flush-after-every-trip routine, raw-water and closed cooling parts that wear faster in salt, bottom paint that suits your hull and drive, marine-grade hardware, and trailer upgrades that survive salt dunks. Built from BoatUS, Mercury, Yamaha and Boating Magazine advice.

3 h Outboard, Sterndrive (I/O), Gas inboard, Marine diesel, Jet ski / PWC Shop: $200-800
ElectricalModerate

NMEA 2000 Network Basics and Troubleshooting (Plus Chartplotter Updates)

Understand the backbone, terminators, power tap and drop cables that tie your chartplotter, engine data, GPS, depth and autopilot together, then track down why a device keeps dropping off. Finish by updating chartplotter and device software the safe way.

1 h 30 min All engines Shop: $150-450
TroubleshootingModerate

No Spark - Safe Ignition Checks for Outboards, Sterndrives, Inboards and PWCs

Engine cranks but never fires, and you suspect the ignition? Work from the cheap, common causes (kill switch lanyard, key switch, plug wires and caps, plugs, battery) to a proper spark test, and learn what the stator, CDI and coils do and when it is time for a dealer.

1 h Outboard, Sterndrive (I/O), Gas inboard, Jet ski / PWC Shop: $150-600
Hull & systemsEasy

Oil or Fuel in the Bilge: Safe, Legal Cleanup

What to do when you find oil, diesel or gasoline in your bilge. Soak it up with oil-only absorbents, keep it from being pumped overboard, dispose of it properly, report any sheen on the water to the National Response Center, and find the leak so it does not happen again.

1 h All engines Shop: $100-500
Buying & ownershipEasy

On-Water Towing Plans: BoatUS vs. Sea Tow vs. Your Insurance Towing Coverage

Compare a BoatUS or Sea Tow towing membership with the towing coverage on an insurance policy: what each pays for (tows, soft ungroundings, jump-starts, fuel delivery), why hard groundings and sinkings are salvage that only hull insurance covers, how to call for help, and what to have ready when you do.

30 min All engines
Routine serviceEasy

Onboard Tool Kit and Spare Parts: What to Carry on a Day Boat or a Cruiser

Build a tool kit and spares box that fits your boat and how far you go. A blown fuse, a clogged fuel filter or a dinged prop shouldn't end the day or turn into an expensive tow.

1 h 30 min All engines
TroubleshootingModerate

Outboard Fell Overboard or Engine Got Submerged: What to Do in the First Hours

A dunked engine can often be saved, but only if you act fast and in the right order. Learn what to do (and what never to do) in the first hours after an outboard goes overboard or a boat swamps, how to buy time until a shop can take it, and when it is a loss.

3 h Outboard, Sterndrive (I/O), Gas inboard Shop: $250-1500
Hull & systemsModerate

Outboard Hydrofoil Fins: Do They Help, and How to Install One Safely

Learn when a bolt-on hydrofoil (the fin that mounts on the anti-ventilation plate) can help a boat plane sooner or stop porpoising, what it can cost you in top speed and handling, and how to mount one without drilling into an anode, trim tab or speed pickup.

1 h Outboard, Sterndrive (I/O) Shop: $100-250
TroubleshootingModerateDraft

Outboard or Sterndrive Rough or Surging Idle: Find the Cause, Cheapest Check First

An engine that shakes, hunts or surges at idle but runs fine on plane is telling you something specific. Learn how to read the pattern, then work in order from free checks (warm-up, tank vent, primer bulb, fuel) through plugs, air leaks, carburetor idle circuits and the idle air control valve, and know when it's time for a compression test or a dealer scan.

1 h 30 min Outboard, Sterndrive (I/O) Shop: $150-600
TroubleshootingModerate

Outboard or Sterndrive Vibration - Troubleshooting Guide

Track down a new shake or buzz by noting when it happens (neutral or in gear, which rpm), then check the prop, hub, shaft, mounting bolts, motor mounts, engine height and misfires in order, from the simplest to the most serious.

1 h 30 min Outboard, Sterndrive (I/O)
ElectricalModerate

Outboard Stator and Rectifier/Regulator: Symptoms, Safe Owner Checks and When to Hand Off

Most outboards charge the battery with a stator under the flywheel and a rectifier/regulator. Learn how to read the symptoms of undercharging, overcharging and intermittent charging, what voltage checks and inspections an owner can safely do, and which tests and repairs belong to a technician with the service manual.

45 min Outboard Shop: $200-900
Hull & systemsModerate

Outrigger Care: Poles, Halyards, Release Clips and Bases

Keep your outriggers strong and working by rinsing them after every trip, checking poles, halyards, pulleys, release clips and through-bolted bases for wear and corrosion, storing them down and secured, and handling them safely under way and near power lines.

1 h 30 min All engines Shop: $150-600
TroubleshootingEasy

Overheat Alarm: What to Do in the First 60 Seconds

A short, practiced routine for the moment the temperature alarm goes off: take the load off, look for cooling water, shut down if it isn't there, and check every space the exhaust runs through for heat or fire. Based on a June 2026 Coast Guard safety alert about a fatal fire that started with an overheat alarm.

15 min Outboard, Sterndrive (I/O), Gas inboard, Marine diesel
Buying & ownershipModerateDraft

Owning a Boat in an LLC or Trust: Reasons, Registration, Coast Guard Documentation, Taxes and Insurance

Why some owners put a boat in an LLC or a trust, what it does and doesn't do for liability, how it changes state titling and Coast Guard documentation, why states go after out-of-state LLC tax schemes, and how to keep the insurance, loan and paperwork lined up. General information, not legal or tax advice.

2 h All engines

Safety: BoatMend is for information only and does not replace a certified marine technician. You are responsible for your safety and your boat. Read the full disclaimer.