Marine diesel propulsion serves a remarkably broad section of the marine industry, from compact engines powering smaller sailing and recreational vessels to high-output diesel systems installed in large yachts, fishing vessels, workboats and commercial ships. Unlike selecting an engine purely by horsepower, a proper marine diesel specification takes account of vessel displacement, operating profile, engine loading, cruising speed, transmission, cooling system, exhaust arrangement, installation dimensions and the number of hours the engine is expected to operate. Our marine diesel sourcing portfolio covers Yanmar, Volvo Penta, Cummins, Caterpillar, MAN and mtu, giving customers access to established diesel-engine families across a substantial range of marine applications. Whether you are sourcing an engine for a new vessel, replacing an existing power unit, undertaking a repower or procuring propulsion for a commercial fleet, we can work from your vessel information, required output, existing engine or preferred manufacturer and help identify the appropriate marine diesel solution.

Yanmar Marine Diesel Engines

Yanmar’s marine diesel range provides one of the clearest progressions from compact propulsion to higher-output powerboat and light-commercial engines. The current manufacturer catalog covers 10 to 640 MHP, with separate families developed around different vessel sizes and operating requirements. Yanmar’s current portfolio includes HVO-approved engines and extensive use of common-rail technology across its larger modern platforms.

GM Engine Series

Yanmar GM marine diesel:

* 1GM10 — 9 MHP / 6.6 kW

YM Series

Yanmar YM marine diesel:

* 2YM15 — 14 MHP / 10 kW
* 3YM20 — 21 MHP / 15.3 kW
* 3YM30AE — 29.1 MHP / 21.3 kW

JH-CR Series

Yanmar JH-CR marine diesel:

* 3JH40 — 40 MHP
* 4JH45 — 45 MHP
* 4JH57 — 57 MHP
* 4JH80 — 80 MHP
* 4JH110 — 110 MHP

4LV Series

Yanmar 4LV marine diesel:

* 4LV150 — 150 MHP
* 4LV170 — 170 MHP
* 4LV195 — 195 MHP
* 4LV230 — 230 MHP
* 4LV250 — 250 MHP

8LV Series

Yanmar 8LV marine diesel:

* 8LV320 — 320 MHP
* 8LV350 — 350 MHP
* 8LV370 — 370 MHP

6LY Series

Yanmar 6LY-CR marine diesel:

* 6LY400 — 400 MHP
* 6LY440 — 440 MHP

6LF Series

Yanmar 6LF marine diesel:

* 6LF485 — 485 MHP
* 6LF530 — 530 MHP
* 6LF550 — 550 MHP

6LT Series

Yanmar 6LT marine diesel:

* 6LT500 — 500 MHP
* 6LT580 — 580 MHP
* 6LT640 — 640 MHP

This progression gives Yanmar coverage from compact sailboat and small-craft propulsion through larger planing vessels, motor yachts, fishing boats and light-duty commercial applications. The manufacturer’s current marine catalog confirms these family ranges and individual output levels.

Volvo Penta Marine Diesel Engines

Volvo Penta takes a different approach, with its marine diesel portfolio divided across compact inboard propulsion, larger recreational engines and high-output commercial marine platforms. Its current marine engine catalog includes D1, D2, D4, D6, D8, D8 MH, D11, D13 and D16 MH families, with individual ratings within each platform.

D1 Series

Volvo Penta D1 marine diesel:

* D1-13 — 12.2 HP
* D1-20 — 18.8 HP
* D1-30 — 27 HP

Volvo Penta describes the D1 as a compact naturally aspirated diesel with freshwater cooling, low-speed torque and a design intended for reduced vibration and extended service life.

D2 Series

Volvo Penta D2 marine diesel:

* D2-50 — 50 HP
* D2-60 — 60 HP
* D2-75 — 75 HP

The D2 uses a 2.2-liter four-cylinder architecture and is available across naturally aspirated and turbocharged configurations depending on rating.

D4 Series

Volvo Penta D4 marine diesel:

* D4-145 — 145 HP
* D4-175 — 175 HP
* D4-230 — 230 HP
* D4-270 — 270 HP
* D4-300 — 300 HP
* D4-320 — 320 HP

The D4 is a 3.7-liter four-cylinder common-rail diesel with Electronic Vessel Control and electronic shift and throttle.

D6 Series

Volvo Penta D6 marine diesel:

* D6-300 — 300 HP
* D6-340 — 340 HP
* D6-380 — 380 HP
* D6-440 — 440 HP
* D6-480 — 480 HP
* D6-440 WJ — 440 HP
* D6-480 WJ — 480 HP

The D6 is a 5.5-liter inline-six common-rail diesel platform, with the WJ configurations providing waterjet-specific propulsion applications.

D8 Series

Volvo Penta D8 marine diesel:

* D8-450 — 450 HP
* D8-500 — 500 HP
* D8-550 — 550 HP
* D8-600 — 600 HP

D8 MH Series

Volvo Penta D8 MH marine diesel:

* D8 MH 209 HP
* D8 MH 230 HP
* D8 MH 265 HP
* D8 MH 301 HP
* D8 MH 355 HP
* D8 MH 370 HP
* D8 MH 405 HP
* D8 MH 425 HP

The D8 MH is configured for marine commercial applications and is available across several rated-power configurations and emissions specifications.

D11 Series

Volvo Penta D11 marine diesel:

* D11-510 — 510 HP
* D11-625 — 625 HP
* D11-670 — 670 HP
* D11-725 — 725 HP

The D11 uses a 10.8-liter inline-six architecture and is designed for larger vessels requiring substantial marine diesel output.

D13 Series

Volvo Penta D13 marine diesel:

* D13-700 — 700 HP
* D13-800 — 800 HP
* D13-900 — 900 HP
* D13-1000 — 1,000 HP

D13 MH Series

Volvo Penta D13 MH:

* D13 MH 400 HP
* D13 MH 500 HP
* D13 MH 600 HP

D13 IMO III Series

Volvo Penta D13 IMO III:

* D13 IMO III 700 HP
* D13 IMO III 800 HP
* D13 IMO III 900 HP
* D13 IMO III 1,000 HP

Volvo Penta’s current D13 documentation confirms the 700, 800, 900 and 1,000 HP ratings.

D16 MH Series

Volvo Penta D16 MH marine diesel:

* D16 MH 550
* D16 MH 650
* D16 MH 750
* D16 MH 850

The D16 MH provides Volvo Penta’s higher-output commercial marine diesel platform within its current marine range.

Cummins Marine Diesel Engines

Cummins approaches marine diesel propulsion across recreational, commercial and high-horsepower applications. Its current marine guide separates propulsion products by power and duty rating, with the range extending from the B4.5 and QSB platforms through the very high-output QSK families. Importantly, Cummins publishes different duty classifications for its marine engines, so the appropriate model is determined not simply by peak horsepower but by the vessel’s actual operating profile.

B Series

Cummins B Series marine diesel:

* B4.5

QSB Series

Cummins QSB marine diesel:

* QSB6.7
* QSB7

The current Cummins marine material places the combined QSB6.7/QSB7 range at approximately 230–550 HP depending on rating and configuration.

QSC Series

Cummins QSC marine diesel:

* QSC8.3

Current marine ratings extend through approximately 600 HP.

QSL Series

Cummins QSL marine diesel:

* QSL9

Current marine ratings cover approximately 290–410 HP.

QSM Series

Cummins QSM marine diesel:

* QSM11

Current marine ratings extend to approximately 715 HP.

X Series

Cummins X Series marine diesel:

* X15

The current X15 marine range is approximately 450–600 HP.

QSK19 Series

Cummins QSK19 marine diesel:

* QSK19

Current marine ratings span approximately 500–800 HP.

QSK38 Series

Cummins QSK38 marine diesel:

* QSK38
* QSK38 Tier 4 / IMO III

The standard marine range reaches approximately 1,400 HP, while the newer emissions configuration extends to approximately 1,500 HP.

QSK50 Series

Cummins QSK50 marine diesel:

* QSK50

Current marine ratings extend from approximately 1,700 to 2,200 HP.

QSK60 Series

Cummins QSK60 marine diesel:

* QSK60

The current marine product is rated at approximately 3,000 HP.

QSK95 Series

Cummins QSK95 marine diesel:

* QSK95

The QSK95 represents the extreme high-output end of the current Cummins marine propulsion portfolio, with published ratings from approximately 3,200 to 4,200 HP.

Caterpillar Marine Diesel Engines

Caterpillar’s current commercial propulsion catalog contains 16 marine propulsion products, ranging from the C7.1 through the C280-16. Unlike some manufacturers, Caterpillar generally identifies its marine propulsion products directly by engine family rather than presenting a long list of horsepower-specific commercial model names. The following therefore represents the actual current commercial propulsion product structure rather than artificially creating model variants.

C7 Series

Caterpillar C7 marine diesel:

* C7.1

Current commercial propulsion ratings are approximately 280–425 bhp.

C9 Series

Caterpillar C9 marine diesel:

* C9.3

C12 Series

Caterpillar C12 marine diesel:

* C12

C18 Series

Caterpillar C18 marine diesel:

* C18

Current commercial ratings reach approximately 803 bhp, depending on application and rating.

C32 Series

Caterpillar C32 marine diesel:

* C32
* C32B

3400 Series

Caterpillar 3400 marine diesel:

* 3406C

3500 Series

Caterpillar 3500 marine diesel:

* 3512C
* 3512E
* 3516C
* 3516E
* 3516E High Output

C280 Series

Caterpillar C280 marine diesel:

* C280-6
* C280-8
* C280-12
* C280-16

The C280-16 currently reaches up to 6,000 bkW, placing the family firmly within very high-output commercial marine propulsion.

MAN Marine Diesel Engines

MAN’s marine diesel portfolio is particularly important for customers operating professional vessels where engine duty, emissions compliance and high power density are major considerations. Its current commercial shipping portfolio separates engines according to light, medium and heavy-duty operation, with both conventional diesel and alternative configurations available.

D2676 Series

MAN D2676 marine diesel:

* D2676
* D2676 Hybrid

The conventional platform is available across light, medium and heavy-duty operating classes.

D2868 Series

MAN D2868 marine diesel:

* D2868
* D2868 Hybrid

D2862 Series

MAN D2862 marine diesel:

* D2862
* D2862 Dual Fuel
* D2862 Hybrid

The conventional D2862 currently covers multiple duty classes and reaches approximately 1,471 kW in its highest published configuration.

D3872 Series

MAN D3872 marine diesel:

* D3872

This platform occupies the higher-output end of MAN’s current commercial marine engine portfolio.

mtu Marine Diesel Engines

mtu, a Rolls-Royce Power Systems brand, occupies the high-performance end of the marine diesel market. Its current commercial marine engine portfolio is organized into the Series 2000, Series 4000, Series 1163 and Series 8000, with individual cylinder configurations and model variants available within each family. mtu’s published commercial range currently extends from approximately 966 HP to 13,410 HP.

mtu Series 2000

mtu Series 2000 marine diesel products include:

* 8V 2000 M72
* 8V 2000 M84
* 8V 2000 M84L
* 8V 2000 M94
* 10V 2000 M72
* 10V 2000 M86
* 10V 2000 M96
* 10V 2000 M96L
* 12V 2000 M72
* 12V 2000 M86
* 12V 2000 M96
* 12V 2000 M96L
* 12V 2000 M96X
* 12V 2000 M96Z
* 16V 2000 M72
* 16V 2000 M86
* 16V 2000 M87
* 16V 2000 M96
* 16V 2000 M96L
* 16V 2000 M97
* 16V 2000 M97L

These configurations give the Series 2000 substantial coverage for yachts, fast vessels and commercial marine applications. mtu’s current product database identifies these individual product names within the Series 2000 family.

mtu Series 4000

mtu Series 4000 marine diesel products include:

* 8V 4000 M53
* 8V 4000 M53R
* 8V 4000 M54
* 8V 4000 M54R
* 8V 4000 M55RN
* 8V 4000 M63
* 12V 4000 M53
* 12V 4000 M53R
* 12V 4000 M54
* 12V 4000 M55R
* 12V 4000 M63
* 12V 4000 M64
* 12V 4000 M65L
* 12V 4000 M65R
* 12V 4000 M73
* 12V 4000 M73L
* 12V 4000 M93
* 12V 4000 M93L
* 16V 4000 M53
* 16V 4000 M53R
* 16V 4000 M54
* 16V 4000 M55RN
* 16V 4000 M63
* 16V 4000 M63L
* 16V 4000 M63R
* 16V 4000 M64
* 16V 4000 M65
* 16V 4000 M65L
* 16V 4000 M65R
* 16V 4000 M73
* 16V 4000 M73L
* 16V 4000 M93
* 16V 4000 M93L
* 20V 4000 M65L
* 20V 4000 M73
* 20V 4000 M73L
* 20V 4000 M93
* 20V 4000 M93L

mtu identifies the Series 4000 as available in 8V, 12V, 16V and 20V configurations, with the current marine product database providing the individual M-series variants.

mtu Series 1163

mtu Series 1163 marine diesel products include:

* 12V 1163 M74
* 12V 1163 M84
* 12V 1163 M94
* 16V 1163 M74
* 16V 1163 M84
* 16V 1163 M94
* 20V 1163 M74
* 20V 1163 M84
* 20V 1163 M94

The Series 1163 is designed for fast vessels and demanding marine applications, with mtu currently publishing a 7,400–9,925 bhp power range.

mtu Series 8000

mtu Series 8000 marine diesel products include:

* 16V 8000 M71L
* 16V 8000 M91L
* 20V 8000 M71
* 20V 8000 M71L
* 20V 8000 M91L

The Series 8000 sits at the extreme high-output end of mtu’s marine portfolio, with the current manufacturer range extending from 9,763 to 13,410 bhp.

Selecting a Marine Diesel by Vessel and Duty

The breadth of these engine families demonstrates why marine diesel selection should begin with the vessel rather than with a generic horsepower search. A small sailing vessel, a planing yacht, an offshore fishing boat and a commercial workboat can all use diesel propulsion while requiring completely different engine characteristics. Displacement, propeller load, cruising speed, engine-room dimensions, transmission ratio and expected annual operating hours all influence the correct selection. For commercial operators, duty classification becomes particularly important because an engine intended for intermittent use should not automatically be substituted for a platform designed around continuous or heavy-duty operation.

The physical installation is equally important. Engine mounts, shaft alignment, exhaust routing, cooling circuits, fuel delivery, ventilation, electrical output and transmission compatibility must all be considered before a replacement or new installation is approved. Modern marine diesel systems may also incorporate common-rail injection, electronic engine management, emissions after-treatment, digital controls and vessel-network integration. For international projects, regional emissions requirements and model availability can further affect the appropriate specification. Our sourcing process therefore starts with the customer’s actual requirement and works toward the correct engine, rather than assuming that the same model is suitable for every vessel.

Marine Diesel Engines for Sale and Repower

We can assist with sourcing marine diesel engines for new vessel construction, repower projects, replacement installations, yacht propulsion, fishing vessels, workboats and commercial marine operations. Customers can approach us with an exact engine model when the specification is already established, or provide the vessel make and model, existing engine, required horsepower, number of engines and intended operating profile when they need help determining the appropriate option.

Our international sourcing capability also means customers are not restricted to whatever happens to be available in their immediate local market. Manufacturer availability, regional specifications and emissions configurations can differ, so each inquiry is handled according to the destination and actual vessel requirement.

Send us your vessel details, existing engine, preferred manufacturer, required horsepower or exact model, and our team can assist with sourcing the appropriate marine diesel engine and configuration.