Caterpillar marine engines we service
Our diesel technicians work across the Caterpillar marine range — propulsion and auxiliary — for both pleasure and commercial vessels. If your model isn't listed, call us; we almost certainly cover it.
Caterpillar Servicing & Scheduled Maintenance
Routine servicing is the cheapest insurance a Cat marine engine can have, and our technicians service the range to manufacturer-recommended intervals. We work to the hours on your engine and the way you run your vessel, keeping logbooks current for survey and resale. Stay ahead of breakdowns with planned maintenance you can rely on — call (03) 9399 5888 to book a service.
Diagnostics & Electronic Fault-Finding
Modern Cat marine diesels like the C9.3, C12.9, C18 and C32 run common-rail fuel systems and ACERT electronic engine management, so accurate diagnosis matters. Our technicians use electronic service tools to read fault codes, check sensors and interrogate the ECM rather than guessing. We pinpoint the real problem first, then quote the fix — no parts-cannon, no surprises.
Repairs, Overhauls & Rebuilds
From a leaking water pump to a full ground-up rebuild, we carry out mechanical and electronic repairs across every Cat marine series. We handle top-end work, in-frame and full overhauls, and complete engine rebuilds — with machining, crack-testing and tolerancing done to spec. We'll always give you a straight assessment of repair versus rebuild versus repower so you spend money where it counts.
Parts, Repower & Installation Support
As an independent workshop we source genuine Caterpillar and quality aftermarket parts to suit your budget and how long you plan to keep the boat. When an old engine is beyond economical repair, we provide repower planning and installation support — including all-makes options where a like-for-like Cat replacement isn't the smart move. Talk to us before you commit, and we'll map the most cost-effective path.
Mobile Service, Commercial & Survey Support
Not every job can come off the water, so we offer mobile service to vessels berthed across Port Phillip Bay and the Melbourne marinas. We support commercial operators with fleet servicing, breakdown response and the documentation needed for survey and insurance. Keep your boat earning with a workshop that understands commercial deadlines.
Vessels & applications we look after
Get a Caterpillar service quote
Tell us your Caterpillar 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
Caterpillar marine service — your questions answered
Do you service Caterpillar marine engines even though you're not a Cat dealer?
Yes. Mariner Engineering is an independent marine workshop, and our technicians service, diagnose, repair and rebuild Caterpillar marine diesels every week. We're not a factory Cat dealer, but we are experienced all-makes diesel specialists who know these engines inside out. You get expert work without dealer-level pricing — call (03) 9399 5888 for a quote.
Can you get genuine Caterpillar parts for my engine?
We source genuine Caterpillar parts as well as quality aftermarket equivalents, depending on your budget and plans for the vessel. For common service items and most repairs we can have parts to hand quickly. Tell us your engine model and serial number and we'll confirm availability and price — request a quote or call (03) 9399 5888.
Do you offer mobile service or do I have to bring the boat to you?
Both. We provide mobile service to vessels berthed across Port Phillip Bay and Melbourne's marinas, and we also carry out heavier work back at our Spotswood workshop. Larger overhauls and rebuilds are usually best done in the shop, but routine servicing and many repairs can be handled dockside. Call us and we'll work out the most practical option.
My Cat is old and tired — should I rebuild or replace it?
It depends on the engine's condition, hours, parts availability and how long you plan to keep the boat. Many older Cats like the 3208, 3406 and 3412 are well worth rebuilding because the cores are tough and parts are still available. We'll give you an honest assessment of rebuild versus repower, with costs, so you can make the right call. Get in touch on (03) 9399 5888 for a no-obligation appraisal.
Can you diagnose electronic and common-rail faults on newer Cat engines?
Yes. We use electronic service tools to read fault codes and live data on common-rail and ACERT-managed engines such as the C9.3, C12.9, C18 and C32. That means we diagnose the actual fault — fuel, sensor, wiring or mechanical — before quoting, rather than throwing parts at it. It saves you money and gets the problem fixed properly the first time.
How quickly can you turn my Caterpillar job around?
Routine servicing and minor repairs are often completed within a day or two, while overhauls and rebuilds depend on parts and machining lead times. We understand commercial vessels need to keep earning, so we prioritise breakdowns and give you a realistic timeframe up front. Call (03) 9399 5888 and we'll let you know where we can fit you in.
Request a Caterpillar service or repair quote
Tell us your Caterpillar 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, Caterpillar. Caterpillar and associated model names are trademarks of their respective owners, used here only to describe the engines we service.