• Diesel and marine

    Diesel and marine

    maximum efficiency – minimum downtime

Welcome to the S-T Diesel and Marine Group

S-T Diesel and Marine Group supports the marine, offshore, chemical, power generation, water, and railway industries. We’re a dynamic, growing and independent company supplying marine components, diesel engine spares, and service for diesel engines, for sterntube seals, and for propulsion systems. We have been supporting the marine and power industries for more than eighty years.

The S-T Diesel and Marine Group comprises Simplex-Turbulo Co Ltd and Lincoln Diesels Ltd, as well as the brands Dorman Diesels and Durability Coatings. The S-T group is also an associate and shareholder of Maritime Propulsion Services BV and Maritime Propeller Repairs BV.


Simplex Turbulo logo NEW GOLD LR black bg

Simplex-Turbulo provides servicing and spares suitable for: Bergen, Wärtsilä, Nohab Polar, Stork and Mak. They also provide a range of products for marine propulsion, along with engineers to provide servicing and installation.



Lincoln Diesels NEW GOLD centred LR black bg

Lincoln Diesels provides servicing and spares suitable for Mirrlees Blackstone, Ruston, Ruston & Hornsby, Paxman, Jenbacher, WH Allen, MAN B&W, Sulzer, Pielstick, Detroit and Lister Petter diesel engines, with new and reconditioned spare parts and servicing.



Dorman Diesels logo NEW GOLD black bg

Dorman Diesels, also based in Lincoln, supports Dorman and Perkins diesel engines with new or reconditioned spare parts and servicing. 




MPS LOGO white_gold


Maritime Propulsion Services operate in the marine equipment and ship repair service industry, offering service and spares for propulsion systems. Maritime Propeller Repairs BV (MPR) are a subsidiary of MPS, and offer repairs on propeller blades (including in-situ repair).




Durability logo GOLDSpecialist coatings service for marine, mining and other industries which suffer from abrasion, cavitation or corrosion. Typical applications include propeller blades, thrusters, ventilators, and pump impellers. Suitable for new equipment or restoring worn items.



Our aim is to keep our customers’ engines and vessels working at maximum efficiency and with minimum downtime.

Our strategy for achieving this is to: 

  • develop close relationships with our customers so that we can work together to ensure repairs and dry dockings are carried out seamlessly and fast.
  • invest heavily in stock, and in computer systems, in order to cut down delivery times and enable us to offer better value.
  • cultivate our technical expertise, training our own engineers and liaising with the research departments of our suppliers.
  • constantly reassess the quality both of the components we supply (to ensure longer time between overhaul) and of the service we provide. We aim, at all times, to be professional and honest with our customers.


Valves in storage at the Simplex Turbulo warehouse in Hampshire    Two-large-propellers-fitted-in-drydock-at-night   Piston-heads-on-stock-pallet-at-Lincoln-Diesels



Dorman Diesels Logo
Lincoln Diesels Logo
Diesel Marine Group Logo
Simplex Turbulo Logo
DurAbility Logo

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