Hey folks, if you’ve ever worked with or around landing craft, you know these aren’t your average pleasure boats. They’re the workhorses of coastal ops, military deployments, cargo runs to remote islands, and even disaster relief missions—so keeping ’em running right is non-negotiable. As a landing craft supplier, I get all the questions: “When do I check the engine?” “How often do I replace those drive belts?” “Am I wasting time (or money) on over-maintenance?” Today, I’m breaking down the real maintenance intervals you actually need to follow, no industry fluff, no one-size-fits-all lies. This is stuff I’ve learned from working with the same operators who put our craft through 12-hour straight runs in choppy seas, so let’s get into it. Landing Craft
First, let’s split maintenance into two buckets: routine (weekly, monthly) and scheduled (every X hours, seasonal). Routine stuff is the stuff you can knock out in an hour before a shift, and skipping it is how you end up dead in the water during a mission.
Start with the hull. Landing craft haul heavy cargo—tractors, tanks, pallets of supplies—so their hulls take a beating from scrapes against docks, saltwater corrosion, and impact loads. For the hull, I recommend a weekly visual check: scan for dents, cracks, or rust spots around the waterline and keel. Saltwater eats through steel way faster than freshwater, so if you see a pinprick rust hole, mark it right away—don’t wait for it to turn into a fist-sized leak. Monthly, grab a magnet and check for blisters in the fiberglass (if your craft is fiberglass) or use a thickness gauge for steel hulls to spot thinning from corrosion. Then there’s the bilge—oh man, don’t forget the bilge. Every week, pump it out and check for oil leaks. A slow oil leak in the bilge can turn into a fire hazard if it coats electrical wires, or contaminate the water you’re hauling. Pro tip: keep a small disposable oil absorbent pad in the bilge at all times for quick spills.
Next up, the engine—this is the heart of any landing craft, and we’ve seen so many clients cut corners here. For diesel engines (pretty much standard for landing craft these days), the big number to remember is operating hours, not calendar time. If you run your craft 8 hours a day, 5 days a week, that’s 1,600 hours a year—calendar intervals alone won’t cut it. Let’s break it down: every 50 hours (that’s every ~6 shifts for a cargo craft), you need to change the engine oil and filter, check the coolant level (saltwater kills cooling systems fast—make sure it’s a 50/50 mix of antifreeze and distilled water, not raw seawater), and inspect the air filter. If you’re running in dusty, sandy areas (think construction sites or remote beach launches), check that air filter every 20 hours—replace it if it’s caked with gunk, because a clogged air filter will kill engine power and burn more fuel. Every 250 hours, add fuel filter replacement to the list. Diesel fuel has gunk in it, especially if you’re storing it for long periods, and a bad fuel filter can make your engine sputter mid-run. Also, at 250 hours, check the drive belts for the alternator and water pump—look for cracks or fraying, and if they’re even slightly loose, tighten ’em. We’ve had clients break a belt 100 miles offshore and wait 3 days for a replacement, so don’t cut corners here. Every 500 hours, you’re looking at valve lash adjustment, injector check, and transmission fluid change. And don’t skip the annual engine rebuild if you hit 2,000 hours—wait, no, actually, it’s closer to 1,800 for heavy-use craft. That’s a full teardown: check cylinder walls, replace piston rings, make sure the turbo (if you have one) is clean. Skipping that leads to 30% less power and way higher repair costs down the line.
Then there’s the propulsion system—rudders, propellers, shafts, and steering. These take all the impact from hitting docks, debris, and strong currents. Weekly, check the prop for dings or bent blades (even a tiny ding can throw your balance off and make the engine work harder). Also, grease the prop shaft fitting—saltwater gets in there and causes corrosion, which will lock up your prop. Every 100 hours, inspect the steering linkage—tighten any loose bolts, spray with corrosion spray, and make sure the tiller or hydraulic steering is smooth (no sticking). Every 500 hours, pull the prop and inspect the shaft seal. A bad shaft seal will let water into the gearbox, and gearbox oil mixed with water is a $1,500 repair easy. Oh, and for landing craft with bow ramps (which is almost all of ’em), don’t sleep on the ramp’s hydraulics. That ramp is lifting 10,000+ pounds of metal and cargo, so it needs love. Weekly, check the hydraulic fluid level and look for leaks around the hoses. Every month, test the ramp’s emergency release—if it fails, you can’t unload cargo in a hurry, which is a huge problem for disaster relief. Every 1,000 hours, flush the hydraulic system and replace the filter; old hydraulic fluid gets gritty and will wear out the cylinder seals faster.
Safety gear—this isn’t maintenance, it’s mission-critical stuff. Weekly, check all life jackets, fire extinguishers, EPIRBs (emergency position-indicating radio beacons), and navigation lights. If a fire extinguisher is past its expiration date, swap it immediately—we had a client once whose extinguisher was 6 months expired, and they couldn’t put out a small engine fire, costing them $20k in repairs and a week of downtime. Every month, test the bilge pump and the navigation system (GPS, radar, VHF radio). Also, if you’re operating in saltwater, flush all safety gear with fresh water after every trip—saltwater corrodes the radio antenna and drains the battery of EPIRBs way faster.
Now, what about seasonal maintenance? If you’re in a place with cold winters, or you’re storing your craft for a long time between missions, you can’t just pull it out and leave it. Before storage (or at the start of every off-season), you need to do a “winterization” (or long-term storage) check. Drain all fresh water lines (so pipes don’t freeze and burst), add a fuel stabilizer to the tank (old diesel goes bad in 30 days, so if you’re storing it for 6 months, stabilizer is non-negotiable), and run the engine for 10 minutes after adding the stabilizer to make sure it circulates through the system. Also, pull the prop and give the shaft a coat of anti-corrosion grease, and cover the hull with a breathable tarp—don’t use plastic, it traps moisture and causes mold on fiberglass or rust on steel.
Wait, let’s talk about common mistakes I see clients make all the time. First, calendar-based maintenance instead of hour-based. If you have a craft that only runs 100 hours a year, your oil is still going bad after a year because diesel has moisture in it, so you can’t just go by hours. Second, over-maintaining? No, wait—most people under-maintain. They think “it ran fine last time, why check it now?” But a tiny crack in the hull or a frayed belt will turn into a big problem when you’re in a spot where you can’t call a tow. Third, using cheap parts. I get it, landing craft are a big investment, but a $10 oil filter from a no-name brand will filter gunk way worse than a $20 OEM filter, and you’ll be replacing your engine 2 years earlier.
As a landing craft supplier, I don’t just sell boats—we work with operators to make sure they keep their craft running for decades. We’ve had clients who’ve had their craft for 15 years, all because they stuck to a regular maintenance schedule. The key here is consistency, not perfection. Even if you just do the weekly checks, you’ll save yourself from 90% of the big breakdowns.
Now, if you’re a fleet manager, a military logistics lead, or someone looking to add a reliable landing craft to your ops, let’s chat. We can work with you to build a custom maintenance plan for your specific craft, whether it’s used for coastal cargo, military missions, or disaster response. Don’t wait until your craft is dead in the water to fix it—reach out, and we’ll make sure you’ve got all the info and parts you need to keep things running smooth.
Work Boats References
- U.S. Coast Guard Marine Safety Center. “Landing Craft Maintenance Guidelines for Commercial and Military Vessels.” 2021.
- International Maritime Organization (IMO). “Guidelines for the Operation and Maintenance of Landing Craft for Coastal Cargo Transport.” 2019.
- Society of Marine Engineers (SME). “Diesel Engine Maintenance Intervals for High-Duty Landing Craft.” 2022.
- National Cargo Bureau (NCB). “Hull and Ramp Maintenance Protocols for Landing Craft Carrying Heavy Equipment.” 2020.
Longkou Jinda Shipping Co., Ltd.
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