Diesel Engine Specialists
The engine that keeps your fleet moving — or your vessel earning — is the engine that matters most. We supply and recondition commercial diesel engines for fleet operators, marine customers, agricultural businesses, and industrial operations across the UK.
Cummins. Perkins. Caterpillar. New, reconditioned, and used — with warranty and technical support that backs every engine we supply.
The UK's Diesel Engine Specialists —
Fleet, Marine & Industrial
You've called three suppliers already. Two didn't recognise the engine code. One said they'd call back. You need a diesel engine specialist who knows your engine, has it in stock, and can get it to you the same day — not someone working from a general catalogue who'll ask you to hold.
Commercial Engines supplies commercial diesel engines to fleet operators, marine customers, agricultural businesses, and industrial operations across the UK. We're not a generalist parts supplier with a diesel section. We're a specialist diesel engine supplier built entirely around diesel engines — the brands, the codes, the configurations, and the applications.
Cummins engines across commercial, marine, and generator ranges. Perkins engines for agricultural, industrial, and power generation. Caterpillar for construction, marine, and heavy commercial. And dozens of further brands — from Yanmar and Beta Marine to MAN, Volvo, and Deutz.
We supply. We recondition. We rebuild.
And we stand behind every engine we dispatch.
When Downtime
Isn't an Option
Your vehicle is off the road. The driver's stood down. And every hour that passes is costing your business between £500 and £2,000 you won't recover. With haulage margins at just 2–3%, there's no buffer for this. What you need right now isn't a catalogue — it's a fixed answer and an engine that ships today.
When you call us, you speak to someone who knows DAF, Volvo, Scania, Mercedes Actros, MAN, and Iveco engines. We confirm your engine match, give you a fixed price, and tell you precisely when it ships.
- 40% of fleet operators cite inaccurate pricing as top frustration. We quote what we charge.
- Short block, long block, and complete configurations available.
- Rebuilt to OEM spec with minimum 12-month written warranty.
Specialist Supply for Commercial
Vessels & Canal Boats
80% of marine engine enquiries we receive are emergency repairs — a vessel already off the water, already losing income, with an owner who doesn't have time for a supplier who doesn't know the difference between a Beta Marine 43 and a Beta Marine 60.
We know Beta Marine engines (Beta 25 through to Beta 75), Cummins QSB/QSL units for commercial fishing, and Yanmar engines for compact marine applications. We also hold technical knowledge across heritage brands like Gardner and Lister-Petter (TS and TR series).
- Searching for a specialist since Marine Engine Services closed? We have the stock to help.
- Heritage Brand Knowledge (Gardner, Lister-Petter TS/TR)
- Direct access to our marine specialist team — no generalist holding queues.
New, Reconditioned and Used
You already know you need a diesel engine. What you're trying to work out is which condition class fits your situation — because the wrong choice costs time or money you don't have.
The Reconditioning Process
Diesel engine reconditioning is our core capability. Every reconditioned engine is stripped to bare block, crack-tested, and rebuilt to OEM specification: re-bored or honed bores, new bearings, new seals, reconditioned or replaced cylinder head, pressure-tested and fully assembled before dispatch. That's a proper diesel engine rebuild, not a clean and resell.
| Condition | Typical Cost | Warranty | Lead Time | Best For |
|---|---|---|---|---|
| New | Highest | OEM warranty | Variable (sourced) | Zero-compromise replacement |
| Reconditioned | Mid-range | 12 months parts & labour | 2–5 working days | Working engine, proven spec |
| Used | Lowest | 3 months | From stock | Budget-first, non-critical |
*Every engine leaves us with a documented inspection record and written warranty terms — whatever condition class you choose.
Need an OEM-standard exchange unit? See our remanufactured diesel engines.
Major Diesel Engine Brands
25% of technician time is wasted searching for the right engine from the right supplier. That's lost labour, lost days, and a job that slips further. If your search has already reached this page, here's exactly what we stock — so you can stop searching and start getting a price.
Cummins
4BT (3.9L), 6BT (5.9L), ISBe 4.5 & 6.7 for DAF/Mercedes/Iveco. QSB & QSL for marine/generators.
Perkins
1000 Series (1004/1006) and 1100 Series (1104/1106) for agricultural and construction plant.
Caterpillar
C7 (7.2L), C9 (8.8L), C13 (12.5L), C15 (15.2L) across the full commercial heavy-duty range.
Beta Marine
Kubota-based range from Beta 25 through to Beta 75 for narrowboats and inland waterways.
Yanmar & Others
Yanmar, MAN, Volvo, and Deutz supported across commercial fleet and industrial applications.
Heritage Brands
Specialist supply for Gardner and Lister-Petter (TS & TR series) marine applications.
Industries We Serve
Wherever a diesel engine works hard — on the road, on the water, in the field, or in a plant room — there's a business depending on it.
Commercial Fleet & HGV
Supply for DAF, Volvo, Scania, Mercedes, MAN, and Iveco. Short block, long block, and complete units.
Reconditioned diesel enginesMarine & Canal Boats
Commercial fishing vessels, harbour tugs, narrowboats and offshore workboats.
Marine diesel enginesAgricultural Machinery
Perkins, Cummins, Deutz, and Kubota-based units for tractors, combines, and telehandlers.
Agricultural diesel enginesConstruction Plant
CAT, Perkins, Cummins, and Volvo units for excavators, dumpers, and compressors.
Plant & machinery enginesPower Generation
Standby and prime power engines for telecoms, data centres, and critical infrastructure.
Generator diesel enginesIndustrial Applications
Fixed-plant machinery, pumps, and industrial equipment where reliability is key.
Industrial diesel enginesWhy Choose Us —
Warranty & Expertise
You've been burned before — a supplier who quoted fast and delivered slow, or warranted broadly and covered nothing. We know because you tell us, every time you call after trying someone else.
Warranty You Can Read
Every reconditioned engine comes with a minimum 12-month parts and labour warranty in writing — plain English, no small print.
A Team That Knows Your Code
We match engines to applications before anything ships. Call with a make or code and we'll confirm the right fit.
Transparent Pricing
You'll have a fixed quote before you commit. What we quote is what we invoice.
UK-Wide Supply
We're the diesel engine specialists for fleet and marine customers from Scotland to the South Coast.
We had a DAF LF off the road and needed a Cummins ISBe 6.7 at short notice. Commercial Engines confirmed the engine, gave us a fixed price within an hour, and it arrived in 2 days. It's been running without issue since.
Frequently Asked Questions
Request a Quote
Fleet, Marine or Industrial Engines. You've spent long enough looking. We respond the same day, every day.
Emergency Line
+44 (0)1525 716422
Response within 4 working hours.
Fleet Operators
Your vehicle is off the road — get a fixed price within the hour.
Marine Specialists
Get your vessel back earning. Speak to a marine specialist today.