Welcome to Gardner Engineering

Ours is a small, family-run engine restoration business. We are passionate about Gardner engines.   Gardner is all we do. We consider the Gardner oil engine to be one of the high points in British engineering. 

We will restore and customise a Gardner engine to suit your needs exactly.    Click on “Gallery” to see examples of our finishes.  We have restored: 1L2, 5L2, 2LW, 3LW, 4LW, 5LW, 6LW, 6LXB, 8LXB, 4LK and 8L3B. 

Our engines and parts have been exported to Germany, Canada, Australia, Spain, Latvia, Portugal, Papua New Guinnea and many other countries.

Gardner Instrument Panels and Wiring Looms
Gardner 8L3B
Gardner Generating Sets
Training On Gardner Engines

Training on Gardner Engines

Are you considering some training on Gardner engines?   Perhaps you have just bought a Gardner and would like an introductory course on maintenance?

Or perhaps you have a few Gardners and would like your technical team brought up to speed on their peculiarities?

Either way we can offer training on site, or you are welcome to come and join us here for some hands on experience.   We live in a lovely rural area, ideal for walking, cycling, fishing or enjoying a drink in some authentic Irish pubs!

Please email for details: tangent.gardner@gmail.com.


  • Lester Clarke, West IndiesGardner 6LXB

    At this point the engine is in perfect condition thanks to help of you and your team i must say it give me great pleasure working with you guys and we would continue working together towards the future...

  • Simon Hoey, Australia

    I am amazed will the response time.
    I honestly didn't think I would get a reply.
    Thank you.
    Have watched the video on the fuel pump/motor several times. Awesome thank you.
  • Oded Danielgardner 8lxb love

    Dear Joe,

    Its so nice to get this warm email from you. You are just great!!! 🙂 we love you here!
    So, as mentioned, I just bought a boat with the twin 8LXB 1977 Gardner engines. I am about to prepare the boat for a long off grid exploration journey with my family here in South East Asia. My wife, me and two teenage kids are planning to take the boat from Thailand all of the way to the Fiji islands.
  • Darren Johnson, Oregon, USAgardner engines best
      Received the back plate and ring gear for my old 6LXB.
    Your a knowledge of information and parts for this rare engine in the USA.
    Thank you for helping me receive these transcontinental parts as soon as possible.
    You've got our business as long as we own a Gardner Diesel.
     Thanks Joe!
  • Sophie Butler
    I must thank you again for all the help that you have given my with my engine. You have been a real friend and I can not thank you enough.
  • Des Forde

    Helo Joe,
    Seasonal greetings to you and yours.
    I’m very pleased to tell you that the engine I bought from you is now installed in my barge, and running very well.
    I had to be installed with a heavier flywheel to suit the Reintjes gearbox, and I did river trials this October.
    I did take a long time, but it’s worth it.
    Best regards, Des Fforde

  • John Newman, UK

    knowing that you are there and able to provide expert help and support with Gardner engines, especially (in
    my case) a 4LK, was an important factor in me choosing to go ahead with my purchase of the boat.

  • Lyle & Linda Petke

    We recently purchased and installed a Gardner 6LX in our boat , which is in Tacoma , Washington. Mr Joe McCool has always been able and willing to answer any question that we have, and has been more than willing to supply parts , filters , etc. that we have requested. In our opinion, Mr. McCool is the person we will go to for Gardner assistance , and we highly recommend him without reservation.

  • Warren Williams Queensland Australia

    "Hi I wanted a gardner diesel for my 15meter fishing boat in 2009.I got on the internet and put gardner diesel down and tangent gardner came up and i ended up buying a 8lxb off Joe .Everything he said he did. I was vary worried about sending money over their when i didn't know the company,but every thing he said they did,and the gardner i bought is what he said it was. Thank you Joe."

  • Jack Baker, Plymoth, UK

    "......, we went to look at a Gardner 8LXB at Tangent engineering in Ireland. Joe Mc Cool picked us up and brought us to his house and workshop, where we presented with an 8lxb looking brand new and sounded like new. When we had it delivered, we got it straight into the boat, (fishing vessel Stella Maris). It's a proper marine engine, the best you can get as far as I'm concerned. I would recommend Joe Mc Cool to anybody for his workmanship and presentation. A very good service."

  • John McGrory, Goole, UK

    "i have just unloaded the 8l3b gardner you have reconditioned it is a credit to you and you work force it look,s brand new. well done and thanks best regards".

  • Rokman Bin Mohd Dayan, Malaysia

    "I not good at writing quotes and I only know that Gardner Engines are reliable engines which I can trust with; apart that refurbishment was under the GOOD HANDS of Tangent.Gardner's Team of Management. I don't have any engine problem to date and I believe under proper usage and maintenance, the engine can last another 20 years...Thank you again."

  • Henry Meitzner, Portsmouth

    "Everytime someone talks to me about boat engines it's my great pleasure to mention one good place to buy from when it comes to trustworthy inboard boat engines: I don't need to think twice to instantly recommend Joe McCool's Tangent-Engeneering.
    The good reputation of Gardner Engines doesn't need further comments, but the refurbished Gardners leaving Joe's (and his Team's) hands have experienced the highest grade of precision and loving care a marine engine can wish for.
    It's simply about the love and preservation of traditional maritime engineering to highest standards, not just about engines.
    If someone does not just want a source of propulsion, but a reliable piece of refurbished maritime tradition, Joe's place is the first choice!"

  • Roger Burdett, UK

    "Joe and the team at Tangent provided me with a brilliant recon Gardner 5LW. The engine looked like new and has performed like new not missing a beat in the first 2 years of running. I would have no hesitation in recommending them."