Cummins marine engines we service
Our diesel technicians work across the Cummins marine range — propulsion and auxiliary — for both pleasure and commercial vessels. If your model isn't listed, call us; we almost certainly cover it.
Cummins servicing & scheduled maintenance
Keep your Cummins running reliably and protect its resale value with scheduled servicing carried out by experienced marine diesel technicians. We service the full range — from the QSB6.7 and QSC8.3 through to the QSM11, X15 and QSK platforms — to sensible Cummins-style maintenance intervals using quality oils, filters and coolants. Whether it's a single annual service or a fleet maintenance schedule, we keep clear records so you always know where your engine stands.
Diagnostics & electronic fault-finding
Modern Cummins marine engines run high-pressure common-rail injection and electronic engine management, so accurate diagnosis matters. Our technicians read fault codes, interrogate the ECM, test sensors and pressures, and trace the root cause rather than throwing parts at the symptom. From an overheating alarm to a power loss, a rough idle or an intermittent shutdown, we find the fault and tell you plainly what it will take to fix it.
Repairs, overhauls & rebuilds
When a Cummins needs more than a service, we handle everything from targeted mechanical repairs to top-end work and full overhauls. Our workshop carries out injector and turbo work, cooling and head repairs, and complete rebuilds back to reliable in-service condition. We give you an honest assessment of rebuild versus replace, and a clear written quote before any work begins.
Parts, repower & installation support
We source genuine Cummins and quality aftermarket parts to suit your engine, budget and timeline, and keep common service items on hand for fast turnaround. If your engine is beyond economical repair, we provide repower advice and installation support, including matching to your gearbox, shaft and controls. As authorised Twin Disc and ZF dealers, we can also supply and match the marine gearbox behind your Cummins.
Mobile service, commercial & survey support
We come to you across Port Phillip Bay and greater Melbourne for servicing, diagnostics and repairs that don't need a workshop lift. We also support commercial operators and fleets with planned maintenance to minimise downtime, and carry out pre-purchase and insurance inspections so you buy or insure with confidence. Talk to us about a maintenance schedule that keeps your vessel in survey and on the water.
Vessels & applications we look after
Get a Cummins service quote
Tell us your Cummins model and what you need — a service, a fault diagnosed, or a full rebuild — and we'll get back to you fast from our Spotswood, Melbourne workshop.
Why boat owners choose us
Cummins marine service — your questions answered
Do you service Cummins engines even though you're not a Cummins dealer?
Yes. Mariner Engineering is an independent marine service and repair workshop, and Cummins is one of the brands our diesel technicians work on every day. We're not a factory Cummins dealer, but we service, diagnose, repair and rebuild Cummins marine engines and source the right parts to do the job properly. Call us on (03) 9399 5888 to talk through what your engine needs.
Can you get Cummins parts as an independent workshop?
Yes. We source both genuine Cummins and quality aftermarket parts to suit your engine, budget and timeline, and we keep common service items on hand for quick turnaround. For anything specialised we'll let you know lead times up front so there are no surprises. Tell us your engine model and serial number and we'll confirm parts and pricing.
Do you offer mobile Cummins service around Port Phillip Bay?
We do. For servicing, diagnostics and many repairs we can come to your vessel at marinas and berths across Port Phillip Bay and greater Melbourne. Larger overhauls and rebuilds are best handled in our Spotswood workshop, and we'll advise which approach suits your job. Give us a call on (03) 9399 5888 and we'll arrange a time that works.
Should I rebuild my Cummins or repower with a new engine?
It depends on the engine's hours, overall condition and how you use the boat. We'll inspect it, give you an honest assessment, and lay out the cost of a rebuild against a repower so you can make an informed call. In many cases a well-executed rebuild restores years of reliable service at a fraction of repower cost. Request a quote and we'll spell out your options in writing.
Can you diagnose electronic and common-rail faults on newer Cummins engines?
Yes. Newer Cummins marine engines such as the QSB6.7, QSC8.3, QSM11 and X15 use electronic engine management and high-pressure common-rail injection, and our technicians are experienced in fault-code scanning, live data and pressure testing on these systems. We diagnose the root cause first, then quote the fix — rather than guessing. Book a diagnostic and we'll get to the bottom of it.
How quickly can you turn around a Cummins service or repair?
Routine servicing is usually scheduled within days, and because we stock common Cummins parts we can often complete it in a single visit. Larger repairs and rebuilds depend on parts availability and scope, which we confirm before starting. Call (03) 9399 5888 with your engine details and we'll give you a realistic timeframe and a quote.
Request a Cummins service or repair quote
Tell us your Cummins engine model, your vessel and the service, fault or rebuild you need, and our team will get back to you with a quote — usually within 1 business day.
Mariner Engineering is an independent marine service and repair provider and is not an authorised dealer of, or affiliated with, Cummins. Cummins and associated model names are trademarks of their respective owners, used here only to describe the engines we service.