Marine Diesel PTY LTD

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Marine Diesel PTY LTD Marine Diesel, your experts in Engine Installation and Servicing. Being an authorised Nanni Diesel

"I start it up every few weeks to keep it ticking over. That's good for it, right?"�Good intentions. Not quite the resul...
08/10/2026

"I start it up every few weeks to keep it ticking over. That's good for it, right?"�
Good intentions. Not quite the result you're after.

A diesel sitting at idle doesn't get the same heat or load as it does out on the water. That can mean more condensation, less efficient combustion and an engine that never really gets to work the way it was built to. �Diesels like to work.

If the boat's going to sit for a while, a proper run out on the water - long enough to get fully up to temperature and spend some time under load - is a much better option than simply starting it up and leaving it to idle.

Not sure how best to look after a boat that doesn't get out much? Have a chat with our team.

The engine behind Simba's repower: the NANNI N3.21.A compact 3-cylinder diesel on a Kubota industrial base - proven in s...
07/10/2026

The engine behind Simba's repower: the NANNI N3.21.

A compact 3-cylinder diesel on a Kubota industrial base - proven in some of the toughest working conditions going.

At just 106kg with transmission, it's a natural fit for a light cat like Simba.

A few things worth knowing...
👉The latest-generation heat exchanger gives tighter temperature control - noticeable if you're running a calorifier for onboard hot water, and good for long-term reliability.
👉Molybdenum-coated pistons lower friction and reduce vibration, for quieter running.
👉It meets EU-RCD, US-EPA and BSO emissions standards without any electronics, thanks to NANNI's E-TVCS combustion system.
👉For repowers, dedicated installation kits are designed to fit without modifying your existing engine compartment.

Have a chat with our team about whether the N3.21 is the right fit for your boat.

Simba, a 32-foot composite strip plank sailing catamaran - repowered with twin NANNI N3.21s.At 5 tonnes, she's a light c...
06/10/2026

Simba, a 32-foot composite strip plank sailing catamaran - repowered with twin NANNI N3.21s.

At 5 tonnes, she's a light cat. She didn't need big horsepower - but she needed a bit more than she had.

Her previous engines were lower powered. Stepping up to the N3.21s on shaft drive gave her more in reserve, and that's made a big difference to safety when cruising.

Swipe through for the install and the numbers.

Have a chat with our team about repower options for your cat.

Our Spring service slots are booking up quickly.If you want your boat sorted before summer hits, now's the time to get i...
27/09/2026

Our Spring service slots are booking up quickly.

If you want your boat sorted before summer hits, now's the time to get in touch with the team.

The engine behind Nee-Ron's repower: the 6.420TDI, 320hp on a Toyota base.A few details worth knowing beyond the spec ca...
24/09/2026

The engine behind Nee-Ron's repower: the 6.420TDI, 320hp on a Toyota base.

A few details worth knowing beyond the spec card - 4 valves per cylinder for better breathing, a turbocharger paired with an intercooler for reliable performance under load, and closed cooling with a heat exchanger to keep it running consistently.

Peak torque of 804Nm at 2400rpm - the kind of pulling power that matters most at the low end.

This is the powerplant that took Nee-Ron from an older diesel to more power, without touching the drive itself.

Planning a repower of your own? Have a chat with our team.

Nee-Ron, a 9.2m GRP Markline 900 Flybridge Cruiser, repowered with a 6.40TDI.Reusing the existing Volvo Sterndrive to ke...
22/09/2026

Nee-Ron, a 9.2m GRP Markline 900 Flybridge Cruiser, repowered with a 6.40TDI.

Reusing the existing Volvo Sterndrive to keep the job straightforward while still lifting performance.

Previous diesel out. More power in, without touching the drive itself.

For a 4.3-tonne, 9.2m cruiser, that's a solid step up in performance.

Higher power. Better performance. An easier boat to run.

Most diesel engines are liquid cooled. Coolant runs through the engine, picks up unwanted heat, and carries it away. In...
22/09/2026

Most diesel engines are liquid cooled.

Coolant runs through the engine, picks up unwanted heat, and carries it away.

In a car, that heat gets dumped at the radiator using outside air. On a boat, there's no airflow through the engine bay to do the same job - so we use the seawater around the hull instead.

Older engines used to pump seawater straight through the internals. Simple, but seawater is highly corrosive - not something you want circulating through the parts that need to last.

That's why modern marine engines run heat exchanger cooling instead. Coolant stays in its own sealed loop through the engine. Seawater flows through a bundle of tubes inside the heat exchanger, coolant flows around the outside of them, and heat passes through the tube walls from one to the other.

Coolant goes back to the engine. Seawater gets pumped overboard - usually cooling the exhaust gases on its way out too.

Two separate circuits, doing two different jobs - keeping the corrosive stuff away from the parts that matter.

Last time we talked about why seawater is the toughest thing your engine deals with.This time, let's zoom in on the part...
15/09/2026

Last time we talked about why seawater is the toughest thing your engine deals with.

This time, let's zoom in on the part that takes the first hit - the impeller.

The impeller pumps raw water through the cooling system. It's a simple rubber component, but it's doing a big job every time the engine's running.

Left too long, the rubber vanes crack, wear, tear or lose their "spring" - and a failed impeller means no water flow, which means an overheating engine in a hurry.

Most manufacturers recommend inspecting it every 12 months, more often if the engine sees hard use. It's a cheap part and a straightforward job - one of the best value services you can do.

When did you last have yours replaced?

Back in the quieter months, this Sunreef 70 came in for a full repower - twin NANNI N5.230 CR2s replacing the old engine...
14/09/2026

Back in the quieter months, this Sunreef 70 came in for a full repower - twin NANNI N5.230 CR2s replacing the old engines.

The idea was simple: get it sorted while there's time to do it properly, so it's ready to go the moment summer rolls around.

New engines, new instrumentation, a clean install from bow to stern.

Now she's sitting ready, right on schedule for the season ahead.

Planning your own repower? Let's start the conversation.

Spring's here. Boating season is just around the corner.Before you're back out on the water every weekend, it's worth ge...
12/09/2026

Spring's here. Boating season is just around the corner.

Before you're back out on the water every weekend, it's worth getting ahead of anything that needs sorting while there's still time.

A proper pre-season check goes further than your quick daily once-over - think of it as waking the engine up properly after a few quieter months.

✔️ Seawater system - impellers, hoses, strainers
✔️ Fluid levels - oil, coolant, gearbox oil
✔️ Belts and hoses - checked for wear or cracking
✔️ Filters - fuel, oil, air
✔️ Battery condition and connections
✔️ Anodes - checked and replaced if needed

Sort it now, and you'll spend more time on the water and less time troubleshooting.

Talk to our team about booking a pre-season service.

Address

21/29 Moreton Bay Road
Capalaba, QLD
4157

Opening Hours

Monday 8:30am - 4:30pm
Tuesday 8:30am - 4:30pm
Wednesday 8:30am - 4:30pm
Thursday 8:30am - 4:30pm
Friday 8:30am - 4:30pm

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