Senior Field Service Diesel Technician – Marine
$120,000–$140,000 + super + work vehicle
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 simple 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 easy 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:
Heavy vehicles or trucks
Earthmoving and construction equipment
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
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.
How to apply
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📌 Senior Field Service Diesel Technician – Marine (Melbourne)
🏢 @
📍 Melbourne