Vessel CoreTechnical procurement desk Send RFQ
Engines & Major Components

Marine Engine
Spare Parts Supplier

Engine-room spare parts supply for main and auxiliary engine spares, overhaul items and time-critical RFQs.

Send Engine RFQ View Supply Process
Evidence intake

Maker, model, serial, photos, nameplates, drawings, quantity, port and ETA.

Technical check

Request context is structured before supplier routing or quotation work.

Supply route

OEM route or verified alternative route can be reviewed where appropriate.

RFQ handoff

Commercial request is prepared for clearer supplier review and buyer reply.

Main and auxiliaryEngine spares and overhaul items
OEM + verified alternativesRoute review by criticality and approval context
Technical cross-checkingMaker, model, serial, part book and photos
Port-aware deliveryTime-critical RFQ and port/ETA coordination
Engine spare parts supplier

Engine RFQs handled around maker, model, serial number and vessel schedule.

Vessel Core supplies shipowners, managers, superintendents, purchasing departments, repair yards and maritime agents with marine main and auxiliary engine spare parts.

The request can begin from complete part numbers, engine data plates, part book pages, drawings, photos or an Excel list. We structure the RFQ for technical matching, OEM and verified alternative route review, and port-aware commercial follow-up.

Supply scope

Engine spare parts and overhaul items we can structure into an RFQ.

Coverage for planned maintenance, overhaul supply and time-critical engine-room spare parts requests.

01

Cylinder liners

Cylinder liners, liner seals and related replacement components.

02

Pistons

Piston crowns, skirts, assemblies and associated engine components.

03

Piston rings

Piston ring sets, wear items and overhaul-related ring components.

04

Fuel injectors

Fuel injectors, nozzles, pumps and injection-system spare parts.

05

Bearings

Main bearings, crankpin bearings, thrust bearings and related engine items.

06

Valves

Exhaust valves, inlet valves, seats, spindles, cages and actuator-related items.

07

Gaskets and seals

Gasket sets, O-rings, sealing kits and overhaul consumables.

08

Filters and overhaul kits

Oil/fuel filters, service kits and grouped overhaul item lists.

By engine duty

Main engine spare parts

On a slow-speed main engine a request is tied to a cylinder unit and a build, not to the engine as a whole.

  • Cylinder liners, liner seals and anti-cavitation rings
  • Piston crowns, skirts, rings and piston rod stuffing box parts
  • Exhaust valve spindles, seats, cages and actuator components
  • Fuel valves, injection pump elements, plungers and delivery valves
  • Crosshead, crankpin and main bearing shells
  • Cylinder cover studs, nuts and complete overhaul gasket sets

Overhaul intervals are counted in running hours per unit, so quantities usually arrive as unit sets rather than singles, and the unit number belongs in the request beside the part reference. The Mark number and the build data are what settle a part number when the same designation covers several generations. Access matters too: what can be reached with the engine in place decides the order of the work, and that changes timing more than the part itself does.

By engine duty

Auxiliary engine spare parts

Auxiliaries are medium- or high-speed four-strokes, usually several identical sets, and the request pattern is different.

  • Complete cylinder heads and head components rather than parts of one unit
  • Injectors, nozzles and injection pump elements exchanged as assemblies
  • Turbocharger cartridges, nozzle rings and shaft seal kits
  • Inlet and exhaust valves, seats, guides, rocker gear and pushrods
  • Main and connecting rod bearing shells by shell size and undersize
  • Jacket-water and lube oil pump service kits, thermostat and cooler seals

Because the sets are identical, a quantity is usually multiplied across engines — a valve kit for one auxiliary is rarely a valve kit for one auxiliary. The engine number stencilled on the frame identifies which set the request came from, and the serial number identifies the build; a cylinder position matters far less here than it does on the main engine. Where an auxiliary drives a generator, the alternator side is a separate supply question and is treated as one.

Model index

58 models in this category, filterable.

Start typing a designation, a maker or a part and the rows filter as you go. The full list across the whole site lives on the maker reference page. Full index across every category and maker.

58 models

Model index for this category: designation, series, maker and the parts typically requested.
ModelSeriesMakerTypical parts
CAT 3508CAT 3500 SeriesCaterpillar8-cylinder V-form diesel, auxiliary and propulsion. Cylinder liner sets, piston assemblies, injector tips, turbocharger cartridges, gasket kits.
CAT 3512CAT 3500 SeriesCaterpillarCAT 3512 RFQs can include piston rings, cylinder head gaskets, injector assemblies, water pump seals and valve sets. Confirm the complete engine identity and arrangement.
CAT 3606 · 3608CAT 3600 SeriesCaterpillarLarge-bore medium-speed main propulsion engines. Cylinder heads, piston crowns, exhaust valve assemblies, camshaft components, crankshaft bearing shells.
CAT 3612 · 3616CAT 3600 SeriesCaterpillarHigh-power V-form main engines for large vessels. Fuel injection pumps, cylinder liner kits, charge air cooler elements, governor components, overhaul seal sets.
CAT C18CAT C-SeriesCaterpillarCompact in-line six-cylinder diesel for auxiliary and propulsion. Cylinder head kits, injector assemblies, timing components, cooling circuit seals, gasket sets.
CAT C32CAT C-SeriesCaterpillarHigh-speed marine diesel for fast craft and workboats. Injectors, turbocharger units, piston ring sets, water pump assemblies, heat exchanger elements.
MaK M 20 · M 25 · M 32MaK (Caterpillar group)CaterpillarMaK medium-speed engines built by Caterpillar Motoren in Kiel. Cylinder heads, liners, fuel injection equipment, turbocharger components and overhaul gasket kits — reviewed against the engine evidence supplied with the RFQ.
KTA19Cummins K-SeriesCumminsKTA19 RFQs can include pistons, liners, cylinder heads, injectors, turbocharger components and gasket sets. Confirm the complete engine identity and installed configuration.
KTA38Cummins K-SeriesCummins38-litre V12 high-output marine diesel. Anchor handling tugs and platform supply vessels. Crankshaft bearings, connecting rods, exhaust valves, fuel pump assemblies.
KTA50Cummins K-SeriesCummins50-litre V16 top-output K-series engine. Heavy anchor handlers and large OSVs. Cylinder liners, piston ring sets, turbocharger cartridges, intercooler cores, overhaul kits.
QSB6.7Cummins QSB SeriesCumminsQSB6.7 RFQs can include piston rings, injector nozzles, turbocharger components, gasket sets and cooling-system parts. Confirm model, serial and application evidence.
QSK19Cummins QSK QuantumCumminsQuantum series 19-litre with advanced fuel management. Cylinder heads, injector cups, valve seat inserts, camshaft followers, lube oil system components.
QSK38Cummins QSK QuantumCumminsQSK 38-litre V12 Quantum high-power engine. Piston assemblies, exhaust valve rotators, fuel injectors, turbocharger nozzle rings, cooling system spares.
QSK60Cummins QSK QuantumCummins60-litre top-tier Quantum engine for high-power commercial vessels. Main bearings, piston crowns, cylinder liner sets, complete head assemblies, full overhaul kits.
QSM11Cummins QSM SeriesCumminsQSM11 RFQs can include injectors, cylinder head gaskets, water pump assemblies, intercooler elements and seal kits. Confirm model, serial and application evidence.
DK-20eDaihatsu DK SeriesDaihatsuDK-20e RFQs can include pistons, liners, cylinder heads, fuel pumps and injection valves. Confirm model suffix, serial/build and generator-set evidence.
DK-26Daihatsu DK SeriesDaihatsuDK-26 RFQs can include cylinder liners, piston rings, exhaust valve assemblies, turbocharger nozzle rings and bearing shells. Confirm model suffix and serial/build evidence.
DK-28Daihatsu DK SeriesDaihatsuDK-28 RFQs can include pistons, connecting rods, crankshaft bearings, fuel injection equipment and gasket sets. Confirm configuration, serial/build and part evidence.
DKM-36Daihatsu DKM SeriesDaihatsuDKM-36 RFQs can include pistons, cylinder liners, exhaust valves, turbocharger parts and camshaft drives. Confirm installed duty, serial/build and part evidence.
DL-22Daihatsu DL SeriesDaihatsuDL-22 RFQs can include cylinder heads, valve seat inserts, governor components, cooling-system spares and overhaul kits. Confirm serial/build and part evidence.
DL-26Daihatsu DL SeriesDaihatsuDL-26 RFQs can include fuel injection pumps and plungers, turbocharger interface parts, piston crowns and cylinder head gaskets. Confirm installed duty and build evidence.
DS-26Daihatsu DS SeriesDaihatsuDS-26 RFQs can include liners, valves and injection equipment. Confirm the complete model suffix, installed duty, serial/build and approved overhaul scope.
D2866 · D2876MAN High-speedMAN / MAN B&WHigh-speed marine diesels for fast craft and service vessels. Pistons, liners, injectors, turbocharger units, water pump assemblies.
G80ME-C / S90ME-CMAN B&W ME-C SeriesMAN / MAN B&WElectronically controlled 2-stroke engines. HCU components, exhaust valve actuators, Alpha lubricators, cylinder liner kits.
L16/24MAN Four-strokeMAN / MAN B&WCompact auxiliary diesel. Piston rings, cylinder liners, fuel injection pumps, intercooler elements, crankshaft bearing shells.
L27/38 · V28/32SMAN Four-stroke · L/VMAN / MAN B&WIn-line and V-form medium-speed engines for genset and propulsion duty. Cylinder liner sets, fuel injection equipment, valve-drive components, cooling circuit overhaul kits.
L28/32 · L23/30MAN Four-strokeMAN / MAN B&WMedium-speed auxiliary engines. Cylinder heads, connecting rod bearings, injection nozzles, turbocharger cartridges, gasket sets.
M20 · M25 · M32 · M43MaK Medium-speedMAN / MAN B&WMaK in-line and V-type diesels. Cylinder heads, valve seat inserts, injection equipment, governor parts, cooling system spares.
S70MC / S80MCMAN B&W Two-strokeMAN / MAN B&WLarge-bore slow-speed main engines. Cylinder liners, piston rings, stuffing box seals, turbocharger nozzle rings, camshaft drives.
S6R-MPTKMitsubishi S-series 4-strokeMitsubishiS6R-MPTK RFQs can include cylinder-liner kits, valve seat inserts, fuel injection pumps, governor parts and gasket sets. Confirm serial/build and generator-set evidence.
S6U-MPTKMitsubishi S-series 4-strokeMitsubishiS6U-MPTK RFQs can include cylinder heads, piston kits, connecting rod bearings, injection nozzles, turbocharger parts and cooling-system spares. Confirm serial/build and generator-set evidence.
UEC33LSEMitsubishi UEC 2-strokeMitsubishiUEC33LSE RFQs can include cylinder liners, pistons, exhaust valves and fuel injection pumps. Confirm serial/build, installed configuration and part evidence.
UEC37LAMitsubishi UEC 2-strokeMitsubishiUEC37LA RFQs can include piston rings, cylinder heads, turbocharger nozzle rings, stuffing-box seals and crosshead bearings. Confirm build evidence.
UEC45LAMitsubishi UEC 2-strokeMitsubishiUEC45LA RFQs can include liners, piston crowns, exhaust valves, fuel injection equipment and camshaft-drive components. Confirm the approved overhaul scope and build evidence.
UEC50LSEMitsubishi UEC 2-strokeMitsubishiUEC50LSE RFQs can include cylinder-liner kits, piston assemblies, exhaust valve spindles and seats, turbocharger cartridges and connecting-rod bearings.
UEC52LAMitsubishi UEC 2-strokeMitsubishiUEC52LA RFQs can include main bearings, crankpin shells, cylinder heads, fuel injection pumps and plungers, and governor components. Confirm build evidence.
UEC60LSMitsubishi UEC 2-strokeMitsubishiUEC60LS RFQs can include pistons, liners, exhaust valves, turbocharger interface parts, stuffing-box seals and overhaul gasket kits. Confirm build evidence.
8V 2000 M70/M72MTU Series 2000MTUCompact 8-cylinder Series 2000 for fast craft and service vessels. Cylinder heads, fuel injectors, pistons, cooling system parts, electronic control modules.
12V / 16V 2000 M70/M72/M86/M93MTU Series 2000MTUMid and large Series 2000 configurations. Injection nozzles, cylinder liners, turbocharger cartridges, fuel pump assemblies, gasket and seal kits.
12V 4000 M70/M73/M90MTU Series 4000MTUHigh-power 12-cylinder Series 4000. Injectors, cylinder heads, piston and liner kits, turbocharger components, fuel system parts, ECS control units.
16V 4000 M90/M93MTU Series 4000MTU16-cylinder high-speed marine engine. Cylinder heads, pistons, liners, common rail fuel system components, cooling circuit parts, bearing shells.
20V 4000 M90/M93MTU Series 4000MTU20V 4000 M90/M93 RFQs can include injectors, cylinder heads, turbocharger assemblies, piston and liner kits, fuel-system and electronic-control spares.
BR 4000 C (Rolls-Royce era)MTU BR 4000 CMTUBR 4000 C series covering Rolls-Royce Power Systems-era production. Cylinder heads, injectors, pistons, liners, turbocharger cartridges, electronic control.
Series 396MTU Series 396MTUSeries 396 RFQs can include injectors, cylinder heads, pistons, liners and turbocharger components. Confirm the complete model and serial/build evidence.
Series 8000MTU Series 8000MTULarge-displacement high-speed marine diesel. Injector assemblies, cylinder heads, turbocharger components, fuel system, cooling system, ECU parts.
Sulzer RTA SeriesSulzer Two-strokeWärtsiläLegacy slow-speed main engines — RTA48T, RTA52U, RTA58T, RTA72U. Cylinder liners, piston rings, fuel pumps, exhaust valves, crosshead parts.
Wärtsilä 20Wärtsilä Medium-speedWärtsiläCompact in-line auxiliary engine. Cylinder heads, piston rings, injection nozzles, camshaft bearings, turbocharger cartridges.
Wärtsilä 26Wärtsilä Medium-speedWärtsiläAuxiliary and propulsion diesel. Cylinder liners, exhaust valve assemblies, fuel pumps, crankshaft bearing shells, gasket sets.
Wärtsilä 34DFWärtsilä Dual-fuelWärtsiläDual-fuel medium-speed engine. Standard mechanical parts — pistons, liners, cylinder heads, injection pumps — sourced on request.
Wärtsilä 50DFWärtsilä Dual-fuelWärtsiläLarge-bore dual-fuel main engine. Cylinder kits, fuel injection components, exhaust system parts, cooling circuit spares.
ZA40SSulzer / WärtsiläWärtsiläMedium-speed auxiliary and propulsion engine. Cylinder heads, fuel injection pumps, valve timing components, turbocharger parts, gasket sets.
6AYL-ETYanmar AYL SeriesYanmar6AYL-ET RFQs can include cylinder heads, valve assemblies, injection pumps, heat-exchanger elements and mounting seals. Confirm the installed governor and build evidence.
6AYL-HTYanmar AYL SeriesYanmar6AYL-HT RFQs can include piston rings, liner O-rings, crankshaft bearings, connecting-rod fasteners and lube-oil-system components. Confirm installed configuration.
6EY22Yanmar EY SeriesYanmar6EY22 RFQs can include pistons, exhaust valves, fuel pumps, turbocharger components, governor and speed-control parts. Confirm serial/build and part evidence.
6HAL-DTYanmar HAL SeriesYanmarDirect turbocharged HAL auxiliary. Compact high-speed configuration. Piston ring sets, liner kits, injector nozzles, gasket sets, water pump assemblies.
6MAL-HTYanmar MAL SeriesYanmar6MAL-HT RFQs can include cylinder head assemblies, valve seat inserts, injection equipment, turbocharger interface parts and overhaul kits. Confirm serial/build evidence.
6N18Yanmar N SeriesYanmar6N18 RFQs can include cylinder liners, piston crowns, exhaust valve seats, fuel injectors, intercooler elements and overhaul kits. Confirm serial/build evidence.
6N21Yanmar N SeriesYanmar6N21 RFQs can include cylinder heads, main bearings, camshaft-drive parts, fuel injection pumps and turbocharger cartridges. Confirm serial/build evidence.

This list indicates coverage. It is not stock on hand and not a claim of affiliation with any manufacturer.

In the field

Where these requests actually come from.

Ship engine room during an overhaul, with the main engine cylinder heads covered in protective sheeting and the turbocharger and exhaust trunk exposed above
Engine room during a yard overhaulCylinder heads lifted and covered, turbocharger and exhaust trunk open. A request written in a space like this arrives as a photograph and a partial marking, not as a clean part number.
Face of a marine engine cylinder head after removal, showing four valve bores and their seat faces
Cylinder head, valve sideFour valve bores and their seat faces after removal. What can be measured here — bore, seat and guide condition — is often the only identification a buyer can offer.
Marine engine cylinder head mounted on a green overhaul stand in a ship workshop, opened with valve guides and studs laid out
Cylinder head on the overhaul standThe same component opened on its stand, guides and studs laid out. Serial and casting marks sit on surfaces that stay readable only at this stage of the work.

Photographed by Vessel Core aboard a vessel during a yard visit in September 2026 and published with the owner's permission. The images show the working conditions these requests come from. They are not a claim that Vessel Core supplied the parts shown or carried out the overhaul.

Engine supply route

Turn engine data into a clear supply route.

For engine spare parts, the commercial decision depends on more than a part number. Vessel Core keeps technical identity, vessel timing, approval context and supply route preference in one RFQ workflow.

This helps purchasing teams compare OEM and verified alternative routes while keeping the superintendent, repair yard or vessel agent aligned around the same engine data.

Send Engine RFQ Email Parts List
01 / Identify

Engine and component identity

Maker, model, serial number, part-book position, drawing or photo evidence are matched into one technical request.

02 / Prioritize

Criticality and vessel timing

Planned maintenance, repair-yard schedule or time-critical operating context changes the RFQ route and response priority.

03 / Compare

OEM and verified alternatives

Where suitable, OEM and verified alternative options can be reviewed by approval need, lead time and commercial logic.

04 / Coordinate

Port, ETA and delivery context

Port, ETA, company contact and agent or yard details keep the quotation aligned with the vessel schedule.

What to send

Send enough context to identify the engine, part-book position and urgency.

Engine part numbers are helpful, but serial number, nameplate photos, part-book pages, drawings and old component photos can be enough to begin technical cross-checking.

Vessel and timing

  • Vessel name / IMO
  • Company name
  • Urgency level
  • Port / ETA

Equipment reference

  • Maker
  • Model
  • Serial number
  • Equipment application

Part request

  • Part number
  • Description
  • Quantity
  • OEM / alternative / both

Attachments

  • Photos
  • Nameplate
  • Drawing
  • Excel list
Related categories

Connect this RFQ to the wider engine-room supply scope.

Hub

Engine Room Equipment

 Brand

MAN Parts

 Brand

Wärtsilä Parts

 Brand

Caterpillar Marine Parts

 Brand

Yanmar Marine Parts

 Brand

Daihatsu Marine Parts

 Brand

HiMSEN Engine Parts

 Brand

Hanshin Engine Parts

 Brand

Akasaka Engine Parts

 Brand

Mitsubishi Marine Parts

 Brand

MTU Marine Parts

 Brand

Cummins Marine Parts

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Filters, Gaskets & Seals

 Process

Supply Process
Engine RFQ FAQ

Short answers for technical buyers.

Can you quote engine parts without a part number?

Yes. Send engine maker/model, serial number, part-book page, drawing, nameplate photo or old component photos so the request can be structured.

How are time-critical engine RFQs reviewed?

Add vessel / IMO, urgency, port, ETA and operational impact so the RFQ can be reviewed around timing and supply route.

Can Vessel Core review OEM-route and verified alternative supply?

Yes. OEM-route and verified alternative supply routes can be reviewed by technical criticality, approval requirements, lead time and commercial logic.

Send engine RFQ

Need marine engine spare parts?

Send engine maker, model, serial number, part number or part-book page, quantity and port/ETA. Photos, drawings, nameplates or Excel lists are welcome.

Submit RFQ Email sales@vesselcore.eu