Senior Field Service Diesel Technician – Marine

Senior Field Service Diesel Technician – Marine

$120,000–$140,000 + super + work vehicle

Spotswood, Melbourne VIC | Full time | Monday–Friday

Are you the mechanic people call when nobody else can work it out?

Mariner Engineering is looking for an experienced diesel technician with exceptional diagnostic and problem-solving ability.

You do not need to have worked in the marine industry.

You may currently work on trucks, generators, earthmoving equipment, agricultural machinery, industrial equipment, marine engines or other diesel-powered machinery.

What matters is that you know how to diagnose problems properly, think mechanically and take ownership of a job until it is finished.

We are looking for someone who can walk onto an unfamiliar job, assess the situation, develop a plan and get the equipment operating again. You may need to diagnose an intermittent fault, adapt a component, fabricate a bracket, repair damaged wiring or make a straightforward tool to complete the work.

You will have access to technical information, diagnostic equipment, OEM support and an experienced team—but we need someone who can also think independently when the answer is not immediately obvious.

We would rather employ an exceptional diesel mechanic with no marine experience than an average technician who has only ever worked on boats.

About the role

Mariner Engineering provides mobile mechanical services for recreational and commercial vessels throughout Melbourne.

We are an authorised Volvo Penta and Yanmar dealer, working on vessels generally ranging from 20 to 80 feet. We also regularly work on engines and equipment from Cummins, Caterpillar, Scania, John Deere, MAN, MTU, Nanni and other manufacturers.

This is a hands-on field-service role involving fault diagnosis, repairs, maintenance, engine replacements and mechanical installations.

Most work is completed aboard vessels at marinas around Melbourne, supported by our workshop and team in Spotswood.

You will normally work Monday to Friday, from 8:00 am to 4:30 pm. There is no FIFO roster, no scheduled night shift and no requirement to participate in an after‑hours breakdown roster.

What you will be doing

Your work will include:

- Diagnosing difficult mechanical, fuel, cooling, starting, charging and basic electrical faults





- Testing systems methodically instead of replacing parts until the problem disappears

- Servicing and repairing inboard diesel engines and associated equipment

- Repairing transmissions, driveline components, steering systems and running gear

- Completing engine removals, installations, repowers and commissioning

- Tracing wiring faults using a multimeter, wiring diagrams and diagnostic equipment

- Fabricating or modifying simple brackets, mounts and components when required

- Developing practical repair methods for unusual or unfamiliar problems

- Performing work aboard vessels, including in machinery spaces and confined areas

- Communicating clearly with customers and explaining findings and recommended repairs

- Preparing accurate service reports, job notes, photographs and parts requirements

- Supporting apprentices and less-experienced technicians

- Taking ownership of jobs from initial diagnosis through to testing and completion

Some days will involve scheduled servicing. Other days, you may be investigating a fault that has already defeated another technician.

This role will suit someone who enjoys variety and gets genuine satisfaction from solving difficult mechanical problems.

You may be the right person if you:

- Are an experienced diesel mechanic, field-service technician or mechanical technician

- Have strong fault‑finding and diagnostic ability

- Understand how diesel engines and their supporting systems operate

- Can distinguish the cause of a problem from its symptoms

- Are competent with mechanical measuring and workshop equipment

- Can perform basic electrical testing with a multimeter

- Can fabricate, modify or adapt a simple component when a standard solution is unavailable

- Are comfortable working independently and making sensible decisions in the field

- Take responsibility for the quality and completion of your work

- Communicate professionally with customers and colleagues

- Keep your vehicle, tools and work area organised

- Are willing to learn unfamiliar engines, systems and marine applications

Where you might come from





Relevant backgrounds could include:

- Field-service diesel

- Heavy vehicles or trucks

- Earthmoving and construction equipment

- Power generation

- Agricultural machinery

- Industrial engines and equipment

- Mining equipment

- Marine mechanical

- Defence mechanical maintenance

- Automotive diagnostics with substantial diesel experience

Marine experience is valuable, but it is not essential.

We will provide support and training in marine systems, vessel installations, Volvo Penta and Yanmar products, and the differences between land‑based and marine diesel applications.

Qualifications and licences

You will ideally have:

- A recognised mechanical trade qualification, such as diesel mechanic, heavy vehicle mechanic, mobile plant technician, marine mechanic or an equivalent qualification

- A current Australian driver licence

- The right to work permanently in Australia

A forklift licence, marine experience, welding ability and OEM training are advantageous but not essential.

We are also prepared to consider a highly capable candidate whose experience does not fit neatly into a conventional job title.

What we offer

- $120,000–$140,000 plus superannuation, depending on capability and experience

- A fully equipped service vehicle

- Monday‑to‑Friday daytime hours

- No FIFO roster

- No rostered after‑hours breakdown work

- No regular overnight travel

- Interesting and varied technical work

- Genuine autonomy and responsibility

- Support from an experienced technical team

- Volvo Penta and Yanmar product and OEM training

- Exposure to a wide range of diesel engines, vessels and mechanical systems

- The opportunity to develop specialist marine knowledge without starting another apprenticeship

- A stable, full‑time role with a growing Melbourne marine‑services business

About Mariner Engineering

Mariner Engineering is a Melbourne‑based marine mechanical business specialising in diesel engines, vessel mechanical systems, maintenance, repairs and repowers.

We support both recreational and commercial customers and are committed to completing work properly, communicating honestly and finding practical solutions to difficult problems.

Our workshop is located in Spotswood, with field work undertaken at marinas and vessel locations throughout Melbourne.

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📌 Senior Field Service Diesel Technician – Marine (Williamstown)
🏢 Mariner Group
📍 Williamstown