Tender: NLV Pharos Starboard Forward Engine 40,000‑Hour Overhaul – Northern Lighthouse Board

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Northern Lighthouse Board (NLB) is seeking a supplier for a 40,000‑hour major overhaul of the starboard forward Wärtsilä L20 engine aboard NLV Pharos. NLV Pharos is a diesel‑electric buoy tender with five Wärtsilä L20 marine engines (three 1440 kW 8L20 and two 720 kW 4L20); the starboard forward 4L20 is the subject of this service, to be completed by an experienced contractor in January 2027. The brief scope covers preparatory and ancillary component work including specified cylinder head part replacements; fuel equipment coordination with ship’s staff (fuel pumps removed and sent ashore for third‑party overhaul; injectors overhauled by ship’s staff); valve and governor work; power‑assembly and bottom‑end mechanical overhaul (pistons, liners, crankshaft, main bearings); pump and ancillary overhaul (strip, clean and fit consumables to ship pumps, thermostats, LO cooler, exhaust); and reassembly, Wärtsilä measurement records, commissioning and trials. All spare parts and consumables will be supplied by NLB, the work will be carried out onboard NLV Pharos with onboarding/disembarkation on the east coast of Scotland and accommodation and subsistence provided, and key procurement dates include quotation publication 13 November 2026, submission closing 2pm on 27 November 2026, and award in early December 2026; fuel details are provided in the full quote documents.