Donnelly Engineering

02/06/2026

Another 1HZ-T package palleted up and heading back to the legends at .mechanical 🔥
This build includes:
• Genuine replacement 1HZ cylinder head
• Fully re-sleeved cylinder block (previously at maximum oversize)
• Torque plate honed block
• Cylinder block surfaced using a CBN cutter
• Polished crankshaft
• ACL Race bearings
• Spool H-beam connecting rods
• Turbo-spec pistons
• ADS 11mm boost-compensated pump & injectors
• Genuine seals throughout
Built to handle the boost and ready for many more kilometres. 💪

10/05/2026

When a brand-new engine isn’t an option, sometimes the only choice is bringing the old girl back from the dead 😬😝⚓️
This 4-cylinder 3.0L 181ci MerCruiser came in with severe rust damage and water sitting where it definitely shouldn’t have been… after a cylinder bore failure let water flood the cylinders 💧❌

Instead of replacing the whole engine, we brought it back to life with:
🔧 Re-sleeved cylinder block
🔧 Brand new cylinder head
🔧 New gaskets, bearings & seals
🔧 Fresh piston rings
🔧 Full rebuild and clean-up

The transformation speaks for itself 👌🔥
From rusty and seized… to fresh, clean, and ready to hit the water again 🌊

Proof that sometimes a proper rebuild is all an engine needs 💪⚙️

MarineEngine WorkshopLife EngineRestoration BeforeAndAfter MechanicalRepair BoatMaintenance RebuiltNotReplaced MarineWorkshop EngineBuild OnTheTools

10/05/2026

Cummins 5.9 short block assembly 🔥
You did not in fact have to divorce your wife , become a alcoholic or shave your eyebrows for this package 😝

06/05/2026

🔥 JESSES ONE OF A KIND TD42 ENGINE BUILD 🔥
Built in-house at Donnelly Engineering — this is what happens when there are absolutely no limits.
Starting with a brand-new genuine block and engineered to perfection, this TD42 is packed with the best of everything:
💥 Billet crankshaft & billet main caps
💥 Forged rods with ARP rod bolts & head studs
💥 Mahle pistons & ACL race bearings
💥 Genuine cylinder head with HD valve springs & titanium retainers
💥 ADS boost compensated performance pump + reconditioned injectors
💥 Ross Racing balancer
💥 HPD upgraded crankcase PCV
💥 Stainless freeze plugs, genuine gaskets & seals
💥 Genuine timing cover assembly
✔️ Torque plate honed
✔️ Fully balanced rotating assembly
✔️ Built for strength, reliability, and serious power
No shortcuts. No compromises. Just elite engineering from start to finish.
💪 If you’re chasing the ultimate TD42 setup — this is it.
4x4Australia PatrolBuild HighPerformanceDiesel NoLimits

05/05/2026

30/03/2026

Another 1HDT engine ready to head up to North QLD! 🔧🔥
This build has had the full genuine Toyota treatment — genuine pistons, cylinder head, head bolts, water pump, rod bolts, gaskets, seals, thermostat, head gasket… you name it, it’s in there. Built exactly to the customer’s request with no corners cut.

Paired perfectly with an ADS injection system for reliable performance.

All machining and assembly completed in-house at Donnelly Engineering on the sunny Gold Coast ☀️
Ready to get your engine sorted? Get in touch today to secure your spot:

📧 [email protected]
📞 5531 4499

30/03/2026

Check out Phil’s incredibly tidy TD42 engine package we’ve just finished building 🔥

This engine has been completely stripped down and professionally rebuilt from the ground up:
• Chemically cleaned
• Crack tested
• Block face surfaced
• Liner heights precision machined
• Semi-finished liners freeze-fit, bored & torque plate honed
• Fully balanced bottom-end assembly

It’s topped off with a brand-new cylinder head casting, fitted with heavy-duty valve springs and factory running gear transferred from the original head.

Built using only top-quality components, this TD42 is ready to take on the toughest touring conditions with confidence.

All work is carried out in-house at Donnelly Engineering, and every engine comes backed with a 12-month / 20,000km warranty.

📞 Book yours today: 5531 4499
📧 [email protected]

19/01/2026

It’s an Ls kinda week on the head bench this week 🔥😝