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Diesel Motor Mechanics maintain, test and repair diesel motors and the mechanical parts of trucks, buses and other heavy vehicles such as transmissions, suspension, steering and brakes.


  • detects and diagnoses faults in engines and parts
  • dismantles and removes engine assemblies, transmissions, steering mechanisms and other components, and checks parts
  • repairs and replaces worn and defective parts and reassembles mechanical components, and refers to service manuals as needed
  • reassembles engines and parts after being repaired
  • tests and adjusts mechanical parts after being repaired for proper performance, diagnoses and tests parts with the assistance of computers
  • may inspect vehicles and issue roadworthiness certificates or detail work required to achieve roadworthiness.


  • physically demanding
  • requires driving
  • working outdoors.

To become a Diesel Motor Mechanic

  • You usually need a certificate III in automotive diesel engine technology, automotive diesel fuel technology or another related field to work as a Diesel Motor Mechanic. These courses are often completed as part of an apprenticeship.

    Find a Certificate in Automotive Diesel Technology

  • Registration or licencing may be required.

Skills employers are looking for

  • Repair

  • Communication Skills

  • Forklift Operation

  • Hydraulics

  • Teamwork / Collaboration

  • Truck Repair

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