Vessel CoreTechnical procurement desk Send RFQ
Marine spare parts supplier guide

Wärtsilä and legacy Sulzer parts: start with exact engine evidence.

Vessel Core supplies identified marine engine-room spare parts through quoted OEM and verified alternative supply routes. Engine family names do not prove compatibility; route, availability and stated lead time are confirmed at RFQ stage against the exact evidence.

Send RFQRFQ evidence guide

What to include in the first request

As the supplier, Vessel Core uses the equipment documentation that belongs to the specific vessel and engine to structure the supply review. A maker name or engine family alone is not enough to establish the exact part.

  • Engine identification: maker, engine type, serial number, build data from the nameplate or the vessel documents, and the cylinder number — which is not optional for bearing shells, plunger-and-barrel assemblies and liners, because those are tracked per cylinder.
  • Part evidence: exact part number, part-book page, drawing number, old quotation reference or a clear photo of the marking on the removed part.
  • Component description: position in the assembly, what the component is, material and dimensions where known, and any documentation requirement from the buyer.
  • Operating context: fuel grade, hours run since the last overhaul, nominal or undersize — for bearing shells, the journal grinding size — and whether the liner carries an anti-polishing ring.
  • Commercial context: quantity, required condition if specified, port, ETA and whether an OEM-only route is required.
When the reference is incomplete

Send the records before trying to cross-reference.

A plate photo, old part label, part-book extract, drawing and photo of the installed or removed component can be more useful than a guessed part description. Use the vessel's own technical documentation wherever it is available.

How the commercial route stays clear

State the requirement before alternatives are considered.

Genuine is the engine maker's part in the engine maker's packaging. OEM is the same part from the component maker, without the engine builder's label. A verified alternative is a third-party part to specification. Reconditioned and used stand apart from both. These are not interchangeable labels. In practice, plunger-and-barrel assemblies, turbocharger nozzle rings and bearing shells are usually requested genuine or OEM, while an alternative is reasonable on gaskets, O-rings and fasteners. The quotation can describe a route only after technical identity, approval requirements and supplier evidence are reviewed.

Questions worth answering before quotation

  • Was the number taken off that part, or from the part book for this engine by its serial number — not from a sister ship and not from a superseded revision?
  • Does the buyer require an OEM route, or should available routes be reviewed after identification?
  • Does the line need a class certificate, an inspection record, a material certificate to EN 10204 3.1 or 3.2, or other class-driven documents?
  • Port and vessel ETA, packing requirements — export packing, ISPM-15 wooden case — carriage and the Incoterms basis.
Common questions

Wärtsilä and Sulzer spare parts — common questions

Can Wärtsilä and Sulzer parts be treated as interchangeable by engine family name?

No. Similar family names, the same bore and outward similarity confirm nothing. Parts differ by serial range, drawing revision, material grade and coating: piston rings of one diameter differ by chrome or plasma coating and by the number of rings in a set, bearing shells of one housing size differ by nominal and undersize, turbocharger nozzle rings differ by flow area. Vessel Core publishes no blanket compatibility classification in any form. Requests are reviewed against the actual part evidence and the buyer's approval requirements.

What evidence does a Wärtsilä or Sulzer request need?

Maker, engine type, serial number, the cylinder number — required for bearing shells, plunger-and-barrel assemblies and liners, which are tracked per cylinder — and build data from the nameplate or the documents. For the part itself: the part number, a part-book page, a drawing number, a previous order reference or a clear photograph of the marking on the removed part.

What if the part designation is incomplete?

Send the documents you have rather than a cross-reference you worked out yourself: a nameplate photograph, the old part label, a part-book page, a drawing and a photograph of the component installed or removed. A part-book page or a photograph of the marking on the removed part is worth more than a description from memory.

When does the supply route become clear — OEM or verified alternative?

Technical identity, the buyer's approval requirements and the supplier evidence are confirmed first. The route is then described in the quotation: genuine is the engine maker's part in the engine maker's packaging; OEM is the same part from the component maker without the engine builder's label; a verified alternative is a third-party part to specification; reconditioned and used stand apart. These are not interchangeable terms.