Diesel Engine Repair

From minor service to major overhaul, we undertake diesel engine repairs as well as gas, electric and alternative power engine repairs.

Our services are provided for a vast range of engines such as Caterpillar, Cummins, Detroit, Deutz, Perkins, Scania and Volvo Penta and we are authorised dealers for many of these engine manufacturers – find out more in our parts section.

Typically, we undertake overhauls to the complete appliance, specialising in engine repowers, associated enclosures and canopy repairs.

As well as refurbishing existing diesel, gas, electric or alternative power-driven equipment to a very high standard we also specialise in the repair and refurbishment of a wide range of ancillary components such as pumps, gearboxes, starter motors and alternators. All equipment is overhauled in accordance with the manufacturer’s specifications and design standards and our technicians have many years’ experience with all major brands.

Diesel Engine Repair


  • Engine repair
  • Engine overhaul
  • Engine inspection and health checks
  • Lube oil analysis
  • Fuel condition monitoring
  • Cylinder head reconditioning
  • Cylinder head pressure testing
  • Surface grinding
  • Connecting rod reconditioning
  • Valve face and seat cutting


Our custom-built facilities at our base in Great Yarmouth, Norfolk, incorporates a purpose-built test cell. This facility includes a client witness area and CCTV and is capable of testing engines up to 2,000 brake horsepower with data recorded from an acquisition system.

Take a look at the film of our site which includes footage of the test cell.


Prior Power Solutions has invested in video reporting and provides this new service to all Volvo Penta customers requiring maintenance or repairs.

Our Volvo Penta-trained technicians now provide personalised video reports to provide total transparency of work required and undertaken.

Presented by the technicians themselves, these reports can also convey operating procedures and customer maintenance checks. Delivered straight to customer’s mobile phone number and email, the bespoke reports provide for simple authorisation of any additional works required ensuring customers are back up and running quicker than ever.

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Prior Power Solutions provides a full range of services to allow the complete reconditioning of engine parts including both diesel and petrol engine cylinder heads.

We undertake all works from basic repairs to full reconditioning. Re-building and re-machining corroded and damaged components and meticulously cleaning, reassembling and testing for re-fitting.

Remanufactured to OEM specifications (where available), we don’t just restore the functionality of a component, we carefully completely disassemble each constituent part to clean, inspect, test and requalify. Worn parts are replaced with new, genuine parts and salvageable elements are fully restored. We incorporate any updates or specification modifications during the reassembly.

Following stringent functional tests and inspections, the components we remanufacture are provided with 12 months warranty (subject to terms and conditions) giving you complete peace of mind.

So, for anything from engines (in short, long block and complete formats) cylinder head, turbochargers, fuel pumps & injectors and crankshafts to starters, alternators, electronic control modules and camshafts, contact us to remanufacture your equipment, maximising engine performance and giving it a new lease of life and saving you money compared with a new replacement piece of kit.

Alternatively bring your used assembly to us and exchange it for our of Prior Built or product range replacements.

Reconditioned Engines


  • De-carbonising
  • NDT testing (MPI and dye penetrant)
  • Pressure testing
  • Cylinder head surface grinding
  • Valve re-facing (up to 21mm valve stem)
  • Valve seat cutting and vacuum testing
  • Valve spring tension testing
  • Valve guide replacing
  • Re-tubing
  • Repairing damaged thread
  • Repairing damaged spark plugs
  • Re-plugging
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With a dedicated team of highly professional engineers, Prior Power Solutions is able to accommodate all types of low-speed diesel repair work from minor repairs to full engine rebuilds. Whether the job is onshore or offshore, we are able to offer full support throughout the UK and internationally 24 hours a day, 7 days a week. Our field service engineers are fully supported by an experienced team of workshop-based technicians and knowledgeable parts team ensuring that whatever the project or location, support is always available.

We support the following engine types: MAN, Allen, Wartsila, Ruston, Crossley-Pielstick, Mirrlees Blackstone, Polar and Caterpillar. Other manufacturers are supported, contact our service department for more information.

Diesel Engine Rebuilds