Narrowboat & Canal Boat Diesel Engines — Heritage & Modern Supply
Specialist supply for the UK's 35,000+ licensed canal boats. Legacy Lister and BMC engines rebuilt. Modern Beta Marine keel-cooled replacements in stock. The specialist knowledge that's increasingly hard to find.
The 35,814 licensed boats on Canal & River Trust waters include a significant proportion of older vessels running legacy diesel engines — Lister, Lister-Petter, BMC — for which specialist knowledge and parts supply has become increasingly hard to find following the closure of specialist suppliers in recent years. Commercial Engines fills that gap.
We supply reconditioned and replacement engines for narrowboats and canal boats across the full range: from classic Lister single-cylinders and BMC Commander units through to modern keel-cooled Beta Marine replacements. We know the difference between a keel-cooled and heat-exchanger cooled configuration, we know the fitting requirements for a narrow-beam installation, and we know which engines fit which hulls.
The Specialist Knowledge Behind Heritage Narrowboat Engines
Running a Lister HR2, a BMC Commander 1.5, or a Lister-Petter TS2 means you're already dealing with an engine for which standard diesel suppliers offer nothing. The parts network has thinned, the specialist knowledge is scarce, and most workshops have never seen the inside of a single-cylinder Lister.
We have. We supply reconditioned Lister engines, BMC Commander units, and Lister-Petter TS and TR series — and we carry out full rebuild work on these engines in our workshop. If you need a genuine heritage rebuild, we're one of the few suppliers left with the knowledge and parts access to do it properly.
- Lister HR, HW, and HRW series rebuild and supply
- BMC Commander 1.5 and 1.8 rebuilt to specification
- Lister-Petter TS2, TS3, TR2, TR3 in stock
- 12-month warranty on all reconditioned units
Replacing a Legacy Engine — What You Need to Know
Replacing a Lister or BMC with a modern Beta Marine is not a simple drop-in — it requires consideration of engine mounts, output shaft alignment, cooling system configuration, and exhaust routing. We supply the engine with the knowledge to match: we'll discuss the fitting requirements with you before delivery and can advise on the components needed for a correct installation.
- Engine mount compatibility — original versus modern footprint
- Gearbox selection — PRM, Hurth, and Technodrive options
- Keel-cooling circuit sizing for the replacement engine
- Exhaust elbow configuration for hull exit routing
- Fuel system compatibility and injector pump access
Beta Marine — The Modern Replacement Choice
When a legacy engine has reached the end of its serviceable life — or simply when the owner wants modern reliability, better fuel economy, and cleaner emissions — the Beta Marine Kubota-based range is the natural replacement choice for the UK inland waterways market.
We stock Beta Marine engines from the Beta 25 (25hp) through to the Beta 75 (74hp), in keel-cooled configurations suitable for narrow-beam canal boat installations. We can advise on the correct output for your hull, the fitting requirements, and any gearbox compatibility considerations.
- Beta 25, 38, 43, 50, 60, and 75 — full range
- Keel-cooled configuration for narrow-beam hulls
- Better fuel economy and lower emissions than legacy units
- Gearbox compatibility advice provided
Narrowboat Engine Servicing Parts
We supply a full range of service parts for narrowboat diesel engines — impellers, anodes, heat exchanger elements, oil and fuel filters, injector kits, and gearbox service components. If you're carrying out your own winter service or fitting an engine, we stock the parts you need and can advise on specifications if you're unsure.
Legacy Engine vs Modern Replacement — The Real Comparison
For narrowboats, the right choice depends on the vessel, the owner's priorities, and the engine condition.
| Option | Cost | Reliability | Parts Availability | Best When |
|---|---|---|---|---|
| Heritage Rebuild | Mid-range | High post-rebuild | Scarce but sourced | Engine has sentimental or craft value |
| Beta Marine New | Mid-high | Excellent | Good | Owner wants modern reliability |
| Beta Marine Recon | Lower | Very good | Good | Budget-conscious modern replacement |
| Used Legacy | Lowest | Variable | Scarce | Short-term or temporary solution |
*Call us with your hull details and current engine — we'll recommend the right path for your specific boat.
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.
Beta Marine
Kubota-based range from Beta 25 to Beta 75 — the preferred modern replacement for UK narrowboats and canal boats.
Lister
HR, HW, HRW single and twin-cylinder heritage engines — rebuild and supply for classic narrowboats.
Lister-Petter
TS2, TS3, TR2, TR3 — reconditioned and rebuilt supply, increasingly rare in the market.
BMC
Commander 1.5 and 1.8 — BMC marine diesel rebuilt and supplied, with sourced parts.
Yanmar
Compact marine diesel range for smaller canal boat applications and auxiliary use.
Nanni Diesel
Kubota-based compact marine diesel — alternative to Beta Marine for modern narrowboat installations.
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.
Traditional Narrowboats
Heritage engine rebuild and supply for classic narrow-beam canal craft.
Modern Canal Boats
New Beta Marine and Yanmar supply for modern narrowboat builds and repowers.
Wide Beam Boats
Higher-output engines for wide-beam liveaboard and cruising craft.
Day Hire & Charter Boats
Reliable reconditioned supply for commercial hire fleet operators.
Heritage Restoration
Full rebuild service for classic narrowboats requiring original engine retention.
Winter Lay-Up Servicing
Engine service parts and advice for winter overhaul and recommissioning.
My Lister JP2 had been in the boat for 40 years. I wanted to keep it — not repower. Commercial Engines rebuilt it properly: new rings, new bearings, head work, the lot. They sourced parts I couldn't find anywhere else. It's been running perfectly since recommissioning. They clearly know these engines.