• Over 50 Years of Precision, Innovation & Family Tradition

  • Michael Courtney Diesel Engineering Services Ltd. is Ireland’s leading independent diesel fuel injection specialist. Established in 1968 by the Courtney family and headquartered in Shercock, Co. Cavan, the business has grown through three generations, with Colin Courtney – grandson of founder Michael Courtney – now leading the company into a new era of innovation and performance.

Who We Are

For over five decades, Diesel Engineering Services has provided expert diagnosis, repair, and re-manufacturing of fuel injection systems for cars, vans, and commercial vehicles. From the earliest mechanical systems to the latest in electronic diesel control (EDC) technologies, we’ve stayed ahead of the curve through continuous investment in equipment, training, and expertise.

Our workshop is the only one in the Republic of Ireland authorised to perform manufacturer-approved repairs on Bosch, Continental, Delphi, Denso, and Zexel systems – a mark of trust and technical excellence in our field.

Our History

Founded in 1968, Diesel Engineering Services quickly earned a reputation for quality and technical innovation. We were the first company in the UK and Ireland to offer testing and repairs on Bosch VP44, VP30/29, and Common Rail pumps, and in 2016 became fully authorised by Bosch to handle CP4 pump diagnostics and repairs.

In 1998, our commitment to quality was officially recognised with IS EN ISO 9002 accreditation, making us the first independent diesel engineering company in Ireland to achieve this standard.

What We Do

We specialise in:

  • Diagnostic, repair, and remanufacture of fuel injection systems

  • Bosch, Delphi, Denso, Zexel, Stanadyne, Yanmar, Diesel Kiki systems

  • State-of-the-art Electronic Diesel Control (EDC)

  • Manufacturer-authorised Common Rail and VP system repairs

  • Full engine diagnostics and performance tuning

  • Our advanced facilities include Ireland’s only commercially available 850BHP chassis dynamometer (rolling road) – a critical tool for identifying faults and maximising engine performance across a wide range of vehicles.

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Our Mission

To deliver unrivalled fuel injection expertise through precision engineering, manufacturer-certified repairs, and continuous technical innovation. Our mission is powered by decades of experience, family heritage, and a future-focused commitment to service excellence.

Why Choose Us?

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Over 50 years of diesel engineering experience
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Family-owned and operated with a tradition of quality
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ISO-certified for quality since 1998
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Trusted by customers across Ireland and beyond

Blog Posts

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  • Testing fees 2025
    07 August, 2025

    Testing fees 2025

    1 BOSCH ROTARY, VA, VP, VE, MECH & EDC €175  2 BOSCH INLINE A/M/P/H TYPE €250  3 DELPHI DP 200/210/310/DPC €200  4 DELPHI DPA/DPS €125  5 DENSO V3/V4/V5/V5P €150  6...

    07 August, 2025

    Testing fees 2025

    1 BOSCH ROTARY, VA, VP, VE, MECH & EDC €175  2 BOSCH INLINE A/M/P/H TYPE €250  3 DELPHI DP 200/210/310/DPC €200  4 DELPHI DPA/DPS €125  5 DENSO V3/V4/V5/V5P €150  6...

    Read More
  • Metal shavings in the fuel system?
    07 August, 2025

    Metal shavings in the fuel system?

    Finding metal shavings or filings in a diesel fuel system is a serious issue and usually points to internal component wear or failure, most commonly from the high-pressure fuel pump...

    07 August, 2025

    Metal shavings in the fuel system?

    Finding metal shavings or filings in a diesel fuel system is a serious issue and usually points to internal component wear or failure, most commonly from the high-pressure fuel pump...

    Read More
  • Hartridge CRI-Pro Now Installed at Diesel Engineering Services
    22 July, 2025

    Hartridge CRI-Pro Now Installed at Diesel Engin...

    At Diesel Engineering Services, we're proud to announce that our workshop is now equipped with the Hartridge CRI-Pro, a cutting-edge common rail injector test bench. This powerful equipment allows us...

    22 July, 2025

    Hartridge CRI-Pro Now Installed at Diesel Engineerin...

    At Diesel Engineering Services, we're proud to announce that our workshop is now equipped with the Hartridge CRI-Pro, a cutting-edge common rail injector test bench. This powerful equipment allows us...

    Read More
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