A Diesel Fitter’s job is to repair, service and maintain diesel machinery, plant equipment, engines and heavy vehicles. This often involves diagnosing issues with parts and systems that require a new part to re-crafted to ‘fit’ the repair. Diesel Fitters will often work alongside or in a similar capacity as Heavy Vehicle Mechanics. Diesel Fitters are specialists in diesel engines and the connected systems, where as a mechanic might also carryout works on other areas of the vehicles, such as the electrical or HVAC systems.

Depending on their on-the-job training a Diesel Fitter will specialise in particular machinery, plant equipment or engine types particular to their industry; this could be the machinery and plant equipment essential to open-cut-mining operations, or the machinery and engines used in heavy agriculture industries.

This trade requires a four year apprenticeship. MIGAS will facilitate your practical work placement with one of our quality host employers. In addition to on-the-job training, we will assist you with enrolment through a Registered Training Organisation to complete your certification. With MIGAS you will be fully supported throughout the duration of your placement by a Field Officer and by the wider MIGAS Apprentices and Trainees community.

A day on the job in Diesel Fitting

Use diagnostic equipment such as computers to detect faults
Dismantle, replace and assemble engineering components
Maintain fluid power systems for mobile plant machinery
Maintain engine cooling systems and induction/exhaust systems
Test compression ignition fuel systems and tune diesel engines
Dismantle, clean and assess parts as part of an engine bottom-end overhaul
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Skill Requirements for success in Diesel Fitting Apprenticeships

  • Practical and manual work
  • Mechanical aptitude
  • Good math, science and computing skills
  • Diagnostic ability


  • Certificate III in Engineering – Mechanical Trade (Diesel Fitting)
  • Certificate III in Automotive Diesel Engine Technology (Diesel Fitting)

Available Apprenticeships

Light Vehicle Mechanic Apprenticeship

Bowen Hills, QLD | JOB ID 4458

Do you dream of learning about the finer things in life? Amazing opportunity to do your mechanical apprenticeship in the luxury car market.

1st year managed service automotive apprentice

Hervey Bay, QLD | JOB ID 4476

We have a great local host company located in Gympie who is looking for an enthusiastic light vehicle apprentice

Mechanical Service Technician Apprenticeship

Eastern Creek, NSW | JOB ID 4488

Highly sought-after opportunity to start your mechanical career via an apprenticeship with a leading Australian company!

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