Most people know Highway and Heavy Parts for our over-the-road diesel expertise — but what many customers don’t realize is that we also supply a full line of marine-rated diesel engine parts for commercial vessels, charter fleets, fishing boats, and recreational boats across the country.
From Caterpillar Marine to Cummins Marine, Detroit Diesel Marine, John Deere Marine, and more, we carry high-quality replacement parts engineered to survive the extreme demands of marine environments: saltwater exposure, constant load, high heat, and long duty cycles.
Whether you’re keeping a single vessel on the water or maintaining an entire fleet, Highway and Heavy Parts has the reliable components you need – backed by expert support, fast shipping, and OEM-level performance.
And below, you’ll find direct links to our most popular marine-specific parts currently available.
What Makes Marine Engine Parts Different – and Why Availability Can Be Limited
Marine diesel engines operate in some of the harshest environments on earth, and because of that, the parts that support them must meet demands far beyond what a typical on-highway engine experiences. Saltwater, humidity, vibration, continuous load, and extreme thermal cycles all push engine components to their limits. This means marine-rated parts have to be engineered, coated, or constructed differently from their land-based counterparts.
Because these parts are so specialized, they’re also produced in much smaller quantities than standard diesel components. Many marine engines use unique calibrations, cooling systems, and hardware that don’t overlap with their land-based versions, which naturally limits aftermarket availability. OEMs maintain tighter control over marine product lines as well, meaning fewer manufacturers, shorter production runs, and fluctuating supply. That’s why some marine components may not always appear on our website – though Highway and Heavy Parts can still source them directly through our supplier network when needed.
Marine Diesel Parts We Offer
- Caterpillar C15, 3406E Marine Camshaft (10R7155)
- Detroit Diesel Series 60 12.7L Marine Camshaft (23525526)
- Detroit Diesel Marine Fuel Injector (5227245MAR)
- John Deere Marine Water Pump (RE504911)
Tips for Maintaining and Replacing Marine Engine Parts
- Always Inspect for Corrosion Before Removal: Saltwater exposure leads to seized bolts, pitted housings, and deteriorated seals. Treat fasteners with penetrating oil and examine surrounding components for hidden corrosion that may also need attention.
- Replace Gaskets and Seals Every Time: Reusing old gaskets on a marine engine is a shortcut that often leads to leaks. Marine applications demand tight, watertight and airtight sealing, especially around cooling components, injectors, and exhaust connections.
- Flush the Cooling System Regularly: Whether your engine uses raw seawater, a heat exchanger, or a hybrid system, flushing is critical to remove salt, sand, and mineral buildup. This extends the life of water pumps, coolers, and thermostats.
- Prime Fuel and Oil Systems After Major Service: Air pockets in a marine engine can cause hard starts, loss of lubrication, or injector damage. Bleed air carefully and verify proper pressures before heading out.
- Monitor Operating Temperatures Closely: Marine engines rarely get a break. Keep an eye on coolant temps, oil temps, and boost pressure during early test runs. Even a slight increase can indicate a failing pump or restricted flow.
- Perform a Sea Trial After Any Major Repair: A controlled dock test is not enough. Once repairs are complete, run the vessel under real load and watch for exhaust smoke, vibration changes, and abnormal RPM fluctuations. Early detection prevents costly mid-season failure.
Order your Marine Parts Today
Guaranteed for fit and function, HHP parts have the right combination of quality and price with total support from our on-staff ASE-certified technicians. With specialized knowledge, quality products, fast shipping, and unbeatable customer service, HHP has you covered. Order the parts for your marine engine today!
Call 844-304-7688 or visit highwayandheavyparts.com to place your order today.
From diagnosis through delivery, we’re Highway and Heavy Parts.
