An experienced marine diesel engineer at your vessel — dockside, at anchor or in the shipyard. Caterpillar, Cummins, MAN and MTU engines diagnosed, repaired, serviced and overhauled across Europe, with worldwide support on request.
Superyacht Engine Service provides on-site marine diesel engine service for superyachts, support vessels and commercial ships. We come to the vessel — dockside, at anchor or inside the shipyard — to diagnose a fault, carry out planned maintenance, complete an overhaul, align a shaft line or get a generator back on load. Engines are the whole job, which is why the diagnosis is quicker and the reporting more precise than a general contractor can offer.
We work throughout Europe from our Dutch base, with worldwide support on request, for chief engineers, yacht management companies, shipyards, marine service companies and commercial operators. Hands-on experience across Caterpillar / CAT, Cummins, MAN and MTU main engines and the generator sets built around them. We are an independent service provider — not an authorised dealer or official service partner of any engine manufacturer.
Engine trouble dockside or underway. On-site fault diagnosis with instruments, in-situ repair, then a sea trial and a documented hand-over.
→ On-site engine repairManufacturer-interval maintenance, oil and filter work, injector and valve service, condition monitoring and per-vessel records.
→ Planned maintenanceTop-end, in-frame and full overhauls scoped from a condition assessment, built to tolerance and delivered with measurement sheets.
→ Engine overhaul & revisionShaft, coupling and genset alignment measured afloat or ashore, with mount and chocking work and a signed before-and-after report.
→ Marine engine alignmentEngine, alternator and control-side diagnosis on marine gensets, plus resistive load bank testing to prove rated output.
→ Generator repairImmediate remote diagnosis by phone or WhatsApp and rapid mobilisation when a vessel is stranded or a departure is at risk.
→ Emergency engineerThe brands that power most of the fleet, serviced independently. Measurement against each manufacturer's published specifications, genuine or equivalent parts declared openly, and documentation an owner, manager or surveyor can rely on.
C7–C32, 3406–3412 and 3508–3516 propulsion engines and CAT gensets, including engines supplied through PON Power.
→ CAT engine service CumminsQSB, QSC, QSL, QSM11 and the QSK family, plus legacy KTA and NTA commercial installations.
→ Cummins repair MANi6 (D2676), V8 (D2868) and V12 (D2862) marine diesels — high-output engines that reward precise setting.
→ MAN engine service MTUSeries 2000 and Series 4000 installations in 8V to 16V configurations, plus MTU-based generator sets.
→ MTU engine service All brandsWhat stays the same whatever the badge: measurement first, manufacturer specifications, documented results.
→ Engine overview CoverageNetherlands and Northern Europe, Palma, Barcelona, the Côte d'Azur, Italy, Malta, Croatia, Greece and Turkey.
→ Where we travelBehind every job is a fixed process: diagnosis, quote, execution, hand-over. Every step is logged, so you don't have to call to find out where things stand.
Superyacht Engine Service is the new name for Marine Service Altena's superyacht division — a Dutch company with years of experience in complex engine overhauls, from inland shipping to international projects. New name, same craftsmanship.
Based in the Netherlands, travelling to vessels wherever they are — Northern European yards and marinas, the full Mediterranean season circuit and the Atlantic coast, with travel beyond Europe on request and remote support for crews worldwide.
Amsterdam, Rotterdam, Vlissingen, Zeeland and Friesland yards, plus Belgium, Germany, Denmark and the UK south coast.
Palma de Mallorca, Barcelona, Valencia, Antibes, Nice, Cannes, Monaco, Saint-Tropez, La Ciotat, Genoa and Viareggio.
Naples, Sicily, Malta, Split, Trogir, Dubrovnik, Athens, Corfu, Rhodes, Bodrum and Antalya.
Yes. Our engineers travel to the vessel — dockside, at anchor or in the shipyard — with tooling and the parts a diagnosis is likely to need, so the first hour on board is productive. Remote assessment starts on the first call, wherever the vessel is in the world.
Caterpillar / CAT (including engines supplied through PON Power), Cummins, MAN and MTU main engines, and the generator sets built around them. We are an independent service provider and not an authorised dealer or official service partner of any manufacturer — see our engine expertise pages.
For urgent cases in Northern Europe and the Mediterranean we normally mobilise within days, and technical advice starts immediately. Call +31 6 20743967 or send a WhatsApp message with the engine type, the alarm shown and the vessel location.
Frequently. We act as the marine diesel specialist inside larger refit and repair scopes for shipyards, yacht management companies and marine service intermediaries — following your procedures, reporting through you and staying discreet with your client.
Yes. The company grew up on commercial and inland shipping engines, where high running hours and unforgiving schedules build diagnostic experience. We serve both fleets with the same engineers.
A written record per vessel: measurements taken, work performed, parts fitted, sea trial or load test results and recommendations for the next interval — in a form you can pass straight to an owner, manager, surveyor or insurer.
Send the details below for a fault report, a maintenance visit or an overhaul quotation, and an engineer will come back to you. If the vessel is stranded or a departure is at risk, call +31 6 20743967 or message us on WhatsApp instead — that is always faster.
Feel free to reach out directly — you'll always get the same point of contact, and for urgent engine or generator failures the phone is the fastest route to an engineer.