Marine Diesel Engines — New Reconditioned & Rebuilt for UK Vessels
Inboard marine diesel engines for fishing vessels, workboats, commercial ferries, leisure craft, and canal boats. Emergency supply available — because a vessel off the water is a vessel not earning.
Marine diesel engine failure is never convenient, but for commercial fishing boats, charter vessels, and working waterway craft, it is a genuine emergency. Every day off the water is income lost that cannot be recovered. Commercial Engines understands the urgency that characterises marine engine supply — we maintain stock of the most common marine diesel units, confirm availability the same day you contact us, and can arrange delivery to harbourside or marina within 24 hours on stocked engines.
We supply marine diesel engines across the full range of UK commercial and leisure marine applications: coastal and offshore fishing vessels, inshore workboats, offshore support craft, commercial ferries, narrowboats and canal boats, and leisure craft of all sizes. Whether you need a marinised replacement engine, a reconditioned inboard, or a heritage engine for a classic vessel, our marine team has the knowledge and stock to help.
When Your Vessel Is Off the Water, Every Hour Counts
The UK commercial fishing fleet operates around 5,200 registered vessels, and the demands placed on their engines are among the most severe in any diesel application — continuous full-load operation, saltwater environment, and zero tolerance for failure.
We supply reconditioned and new replacement engines for the most common commercial fishing vessel powerplants. Our supply model is specifically designed for emergency situations: call us, confirm the engine, get a price, and have the engine on its way to harbourside the next day.
- Emergency supply — vessel-down situations prioritised
- Harbourside and boatyard delivery arranged
- Reconditioned and new supply — your choice
- Marine team with direct engine knowledge
Workboat, Ferry & Offshore Support Vessel Engines
Workboats, commercial ferries, and offshore support vessels operate on demanding duty cycles that require engines built for continuous use. We supply engines for these applications from the major commercial marine engine manufacturers, including reconditioned units that provide the reliability of a fully rebuilt engine at a fraction of new cost.
- Continuous duty commercial marine engines
- Marinised and heat exchanger cooled configurations
- IMO Tier III and UK MCA compliant options available
- Auxiliary power units and shaft generators
- Fast turnaround to minimise vessel off-hire time
Specialist Supply for the UK's Canal Network
Narrowboats and canal boats represent a distinct and significantly underserved market within UK marine diesel. The 35,814 licensed boats on Canal & River Trust waters include a large proportion of older vessels running legacy engines — Lister, Lister-Petter, BMC — for which specialist knowledge has become increasingly hard to find.
Commercial Engines supplies reconditioned and replacement engines for narrowboats and canal boats across the full range: from classic Lister single-cylinders through to modern keel-cooled Beta Marine replacements. We know the difference between a Beta 43 and a Beta 60, and we know the fitting requirements for a narrow-beam installation.
- Legacy Lister, BMC, and Lister-Petter supply
- Beta Marine Kubota-based range in stock
- Keel-cooling and heat-exchanger configurations
- See our dedicated narrowboat engines page
Heritage Marine Engine Supply
For classic and heritage vessels — traditional fishing boats, vintage narrowboats, wooden-hulled craft — we supply and rebuild engines from the legacy marine diesel manufacturers: Gardner 6LXB and 6HLW, Lister HR and HRW series, and BMC Commander units. These are engines for which parts supply and specialist knowledge are increasingly scarce; our network gives us access to both.
Marine Engine Condition Options — Which Is Right for Your Vessel?
The right choice depends on your vessel type, urgency, and budget.
| Option | Warranty | Lead Time | Cost | Best For |
|---|---|---|---|---|
| New | OEM warranty | Variable (sourced) | Highest | Compliance, new-build, max life |
| Reconditioned | 12 months P&L | 2–5 working days | Mid-range | Commercial fishing, workboats |
| Rebuilt | 12 months P&L | 1–3 weeks | Mid-range | Heritage vessels, original engine |
| Used | 3 months | From stock | Lowest | Budget-conscious, leisure craft |
*Call us with your vessel type and engine code — we'll recommend the right option for your specific situation.
Engine Brands We Supply
We stock and supply engines from the world's leading diesel manufacturers. Call with a make, model, or engine code and we'll confirm availability and give you a fixed price.
Cummins Marine
QSB 5.9 & 6.7, QSL 8.9 — commercial fishing vessel, workboat, and offshore support applications.
Volvo Penta
D4, D6, D9, D13 — new and reconditioned Volvo Penta for commercial and leisure marine.
Yanmar
Compact marine diesel range for fishing vessels, leisure craft, and canal applications.
Beta Marine
Kubota-based range from Beta 25 to Beta 75 — narrowboats, canal boats, and inland waterways.
Perkins Marine
4.108, 4.154, 6.354 and the M92B marinised range — heritage and working vessel supply.
Gardner / Lister
6LXB, HRW, TS, and TR series — heritage marine engine rebuild and replacement supply.
Applications & Use Cases
Wherever a diesel engine is critical to operations — on the road, on the water, in the field, or in a plant room — we have the right engine for the job.
Commercial Fishing Vessels
Emergency supply for UK fishing fleet — reconditioned and new inboard engines, harbourside delivery.
Workboats & Ferries
Continuous-duty engines for commercial workboats, passenger ferries, and harbour craft.
Narrowboats & Canal Boats
Legacy and modern keel-cooled engines for the UK's 35,000+ licensed inland waterway craft.
Offshore Support Craft
High-output marine diesels for offshore support vessels and crew transfer boats.
Leisure Craft
Reconditioned and used inboard engines for leisure sailing and motor cruisers.
Heritage Vessels
Gardner, Lister, and BMC rebuild and supply for classic and vintage marine craft.
Our fishing boat's main engine failed mid-season. Commercial Engines had a reconditioned Cummins QSB 6.7 in stock, confirmed the fit, and had it delivered to the harbour the next day. We were back fishing within the week. That's the kind of response you need when a vessel is off the water.