James Troop are specialists in the supply, installation, servicing, overhaul and rehabilitation of industrial or marine application diesel engines and generators.

We have met the needs of the world-wide power generation market for over  150 years.

Since 1960 we have specialised in supporting major diesel engine manufacturers and end users with our technical and practical knowledge.

Utilising our Company resources, employing technical staff and manufacturer trained Field Service Engineers, our aim is to provide a complete ‘one stop’ package covering all types of power generation applications on a 365,24/7 basis.

The Company has a workforce typically of 30 personnel and a turnover of circa £6.0 million. We are ISO 9001:2015 Quality Assurance approved with Lloyds  and meet all current Health & Safety requirements.

We support some of the largest Companies in the world, operating in the rail industry, marine, utilities, industrial, military, Government, offshore & wind farm applications. We are involved in multi fuel applications and deal with most engine manufacturers.

To achieve our aim of a ‘one stop’ service provider we have two established main divisions:-


  • Comprehensive Engine Overhaul and Test Workshop
  • Machine Shop
  • Fabrication and welding facility
  • Component re-manufacturing
  • Field Service Department
  • Electrical Engineering Department
  • Project Engineering Department
  • Fuel equipment overhaul
  • New Engine Sales


An important factor closely tying our activities together is our spare parts division.

Operating under agreements with major engine manufacturers, our fully computerised system provides ‘off the shelf’ genuine spares for a wide variety of engine types and manufacturers.

This facility extends to overnight supply throughout the UK and OVERSEAS to meet tight schedules, thus enabling us to maintain total control over individual sites and provide a ‘one stop’ service of providing manpower, parts and technical support.

The Quality Controlled Stores areas are self-contained units racked by equipment manufacturers name and part number. In addition, we offer a procurement facility to source and supply any equipment parts clients may require.

Download our Terms and Conditions of Business (PDF)

Our Quality Management System is approved to ISO 9001:2015 by LRQA. We are also registered with Achilles UVDB and are a member of RoSPA.

122-11225iso-9001-lrqa-roundel-with-ukas-med-resAchilles Stamp