L'Orange Fuel Injection
Spare Parts
Injection valves, nozzles, injection pump elements and dual-fuel HPDF injectors for WinGD/Sulzer, MAN B&W and Caterpillar/MaK engines
L'Orange fuel injection equipment seen in engine-room enquiries
L'Orange — trading as Woodward L'Orange since Woodward, Inc. acquired the business in 2018 — builds the fuel injection systems fitted inside large-bore two-stroke and medium-speed marine diesel and dual-fuel engines. The equipment reaches a ship already built into another maker's engine, not as a separate purchase, so an enquiry starts from the part in hand and its own marking, together with the engine builder and engine type, rather than from a catalogue page.
Injection Valves for Two-Stroke Engines
An injector is a nozzle, a needle, a spring and a shim stack inside a holder, and each of those is a separate line. Woodward builds its common-rail pumps on one design base from high-speed engines up to two-stroke engines, so the words common rail on a requisition do not narrow the injector down; the engine builder, the engine type and the injector's own marking do. Requests that name only the nozzle leave the holder, the spring and the setting out of the scope, which is where a rebuilt injector stops matching the engine it came off.
Nozzles ordered on their own marking
The marking on the nozzle body is its own designation, and it is the string a buyer usually has in hand. It identifies the spray component rather than the complete injection valve, so send it together with the engine maker and model instead of in place of them.
Plunger & Barrel Pump Elements
The plunger and its barrel are lapped as a pair and are ordered as one item, not as two. Delivery valves, valve seats, springs and the pump element gasket set belong on the same request, listed against the injection pump identity rather than the engine alone.
High-Pressure Common-Rail (HPCR) Systems
The system credited with pioneering common-rail injection for large diesel engines — a rail, pump and injection-valve package that replaces a mechanical fuel pump per cylinder with one pressurised rail feeding every injector. An enquiry against this range is worked from the engine platform and injector type rather than from the rail alone.
High-Pressure Dual-Fuel (HPDF) Injectors
Woodward describes HPDF as two injectors in one unit: one nozzle injects methanol or ammonia at high pressure, the other injects diesel for pilot ignition or full diesel backup, and the diesel side is offered with either pump-line-nozzle or common-rail injection. Because the unit carries two separate fuel paths in one body, an enquiry needs to state whether the pilot side, the gas/alcohol side, or the complete unit has actually failed.
Pilot Fuel Injectors & Pumps
The diesel pilot-injection hardware on a dual-fuel engine. Depending on the design it is a separate, smaller injector with its own pump or rail, or the diesel side of an HPDF twin-nozzle unit, which Woodward offers with either pump-line-nozzle or common-rail injection. Either way it is easy to mis-order against the wrong duty if the enquiry does not say which fuel path the part belongs to.
L'IQ & P2X Injectors
Two different products share this card. L'IQ is Woodward L'Orange's intelligent injector: a pressure sensor close to the nozzle lets it monitor its own function and condition and report them, which is used for drift compensation and condition monitoring. P2X is Woodward's family of multi-fuel injectors for methanol, ammonia and other P2X fuels, split into the High-Pressure Dual-Fuel (HPDF) and Medium-Pressure Injection (MPI) lines. A request should say which of the two it concerns and carry the injector's marking together with the engine builder's own reference.
Pump-Line-Nozzle (PLN) Pumps & Nozzles
The conventional mechanical arrangement: an injection pump, a high-pressure pipe and an injector with its nozzle. Woodward lists mechanical PLN pumps for four-stroke engines of all sizes and for fuels including MDO and HFO. It is a different design from the pump-nozzle unit L'Orange developed with Maybach around 1950, where pump and nozzle share one body, so a request should say whether pump and injector are separate parts joined by a pipe.
Rail & Valve-Block Components
The smaller pressure-control valves, non-return valves and valve blocks that sit between the rail and the injector on a common-rail installation. These items are engine-platform specific and are usually only worth quoting once the injector or pump they sit next to has already been identified.
Where an L'Orange fuel injection enquiry actually gets stuck
Most enquiries that reach us on this equipment trace back to one of three things. L'Orange supplies injection valves, pumps and nozzles as original equipment into engines built by others — WinGD/Sulzer two-strokes, MAN B&W two-strokes and Caterpillar/MaK medium-speed engines among them — so the identical part is often listed twice: once under the engine builder's own drawing or item number, and once under the type and version marking stamped or cast into the injector or pump body itself; a request that only carries one of the two references can still be worked but takes longer to match. A dual-fuel engine also carries at least two distinct injection paths on the same cylinder head — a diesel pilot side and a gas or alcohol side — and an enquiry that does not say which one failed risks the wrong part being quoted; requests are read against the stated duty rather than assumed from the brand name alone. Finally, the company changed ownership and name in 2018 without changing the manufacturer behind the name: an injector, drawing or spares list from before that date may show the name "L'Orange" alone, and anything from Woodward's ownership onward may show "Woodward L'Orange" — neither is treated as wrong or as evidence of a different part.
- Injection valve nozzles, needles & holder assemblies
- Nozzles by the marking stamped on the nozzle body
- Plunger & barrel pump elements, delivery valves & valve seats
- Injection pump element gasket sets
- Common-rail pressure-control & non-return valves
- HPDF twin-nozzle injector components, pilot & gas side
- Pilot fuel injectors & pumps for dual-fuel engines
- Springs, shim stacks & setting components
- Valve blocks & rail ancillary components
- Injector holder & nozzle-cap seal sets
- Complete injector or pump overhaul kits by type and version marking
A main injection valve, a pilot injector and the gas side of an HPDF unit call for different lists even on the same cylinder head — the items above are grouped loosely by duty, but the marking on the part and the engine platform decide which list actually applies. When an injection valve spring is renewed, the compression spring calculator gives the rate and the load at the fitted length of the old spring and the new one, for a comparison before the opening pressure is checked.
Common-rail injection valve — general arrangement
A licensed photograph of L'Orange equipment was not available at publication, so this technical reference illustrates the general arrangement shared by this equipment class.
Illustrative technical reference, not a photograph of L'Orange equipment or a Vessel Core installed reference — a licensed photo of this maker's equipment was not available. Vessel Core has no dealership, distribution or partnership agreement with Woodward L'Orange GmbH or any other manufacturer named here; it operates as an independent spare parts supplier.
Marking data that makes an L'Orange enquiry quotable
The type and version marking is cast or stamped into the injector, nozzle or pump body itself and is usually the fastest route to a correct match. With the items below an enquiry can be priced in one pass; without them it usually comes back with a clarifying question first. How a marking photograph becomes a priced list is set out on the how we work page.
- Engine builder and platform — e.g. WinGD X-DF, RT-flex, MAN B&W two-stroke, or Caterpillar/MaK medium-speed
- Type and version marking cast or stamped into the injector or pump body, copied exactly as it reads
- Nozzle marking copied exactly as stamped on the nozzle body, if the nozzle is being ordered separately
- Which duty the part performs — main fuel injection, pilot injection, or the gas/alcohol side of an HPDF injector — and whether it sits in a common-rail or a pump-line-nozzle system, and on which fuel
- Engine builder's own drawing or spares-list item number, where the ship's own parts book lists one
- Name as marked on the part — "L'Orange" or "Woodward L'Orange" — since both refer to the same manufacturer
- Photograph of the marking plate or stamped body, the mounting flange, and the removed part itself
Supply route review for L'Orange fuel injection equipment.
A main injection valve, a pilot injector and a plunger-and-barrel pump element sharing the same engine platform do not share a parts list. The engine platform, the type marking and the duty performed get settled before anything else.
Cross-referencing two catalogues
L'Orange supplies injection hardware as original equipment into engines built by WinGD/Sulzer, MAN B&W and Caterpillar/MaK, so the same part is often listed once under the engine builder's own drawing number and once under the marking on the injector or pump body. Both references are checked against each other before a quote goes out.
Main, pilot or HPDF side — read correctly
A dual-fuel engine carries at least two distinct injection paths on the same cylinder head, and an enquiry that does not say which one failed risks the wrong part being quoted. Requests are read against the duty stated rather than assumed from the brand name alone.
Older and newer brand-name eras, both recognised
An injector, drawing or spares list from before 2018 may show the name "L'Orange" alone; anything from Woodward's ownership onward may show "Woodward L'Orange". Neither is treated as wrong or as evidence of a different part — the manufacturer behind both names is the same one.
The apostrophe, and other transcription slips
"L'Orange" gets typed into requisitions and search systems as Lorange, L Orange or L. Orange more often than most brand names on this site, usually without anyone noticing until a search comes back empty. Quoting the name exactly as stamped on the part, alongside the type marking, avoids that dead end.
Independent sourcing, not a dealership
Vessel Core is an independent marine parts sourcing company and holds no dealership, distribution, representation or partnership agreement with Woodward L'Orange GmbH or any other manufacturer named on this page. The maker name is used only to identify equipment a buyer already has installed.
Estonian company, registered in Tallinn
Vessel Core OÜ trades from Tallinn as an Estonian company, Reg. 17028043, VAT EE102773714. An injector or nozzle set typically travels as hand-carry with a joining engineer; larger overhaul kits are crated. Supply route, handover option and documentation are confirmed in the quotation.
L'Orange fuel injection parts — questions from the engine room
Which L'Orange injector types come up most often in engine-room RFQs?
Main injection valves for two-stroke engines lead the requests reaching us, followed by nozzles ordered on the marking stamped on their own body, plunger-and-barrel pump elements, and pilot injectors and pumps on dual-fuel installations. Send the type and version marking exactly as stamped on the part together with the engine platform before a parts list is worked up.
Is Woodward L'Orange the same company as L'Orange?
Yes. L'Orange GmbH traces back to a Stuttgart engine-accessories firm founded by the L'Orange brothers in 1933 and was owned in turn by ITT, MTU and Tognum/Rolls-Royce Power Systems before Woodward, Inc. acquired the business from Rolls-Royce Power Systems in 2018. Since then the company has traded as Woodward L'Orange GmbH, so an older part or drawing marked simply "L'Orange" and a newer one marked "Woodward L'Orange" can both be the correct reference for the same manufacturer.
Can an L'Orange part be identified without a part number?
Often yes. The engine platform, the type and version marking cast or stamped into the injector or pump body, and the duty the part performs — main fuel injection, pilot injection or the gas side of a dual-fuel injector — together narrow an enquiry a long way. Where the ship's own parts book lists an engine builder's drawing number for the same item, that reference helps too.
What should an L'Orange fuel injection RFQ contain?
A workable request states the engine builder and platform, the type and version marking from the injector or pump body, and which duty the part serves on that engine — main injection, pilot injection, or the gas/alcohol side of an HPDF unit. A photograph of the marking and of the mounting flange settles most of the remaining questions in one pass.
Can a plunger or a barrel be ordered on its own?
No. The plunger and its barrel are lapped as a pair and ordered as one item. Delivery valves, valve seats, springs and the pump element gasket set belong on the same request, listed against the injection pump identity rather than the engine alone.
Is a new nozzle enough to rebuild an L'Orange injector?
Often not. An injector is a nozzle, a needle, a spring and a shim stack inside a holder, and each of those is a separate line. A request that names only the nozzle leaves the holder, the spring and the setting out of the scope, which is where a rebuilt injector stops matching the engine it came off. The DL, DLL or DLLA marking identifies the spray component, not the complete injection valve, so send it with the engine maker and model.
Is Vessel Core connected to L'Orange?
No, and there is no agreement of any kind. Vessel Core holds no dealership, distribution, representation or partnership agreement with L'Orange, and quoting a component against one of its designations implies no approval by the maker and no claim of interchangeability.
Send the type marking — the parts list follows from it.
Send the engine platform, the type and version marking exactly as stamped or cast on the injector, nozzle or pump body, and which duty the part performs. Each line is then read back against the marking it belongs to before a component reference is fixed against it.
