Engine Assemblies & Diesel Engines for Excavators & Heavy Equipment

Cummins Diesel Engines: Used, Rebuilt & Reconditioned

Cummins is one of the most widely deployed diesel engine manufacturers in the world, powering excavators, heavy plant, agricultural equipment, and over-the-road trucks across every major market globally. The breadth of the Cummins model range means there is a Cummins engine suited to almost every heavy equipment application from compact two- and three-cylinder configurations to high-output inline-six powerplants built for the most demanding operating conditions.

At Imara Engineering, our Cummins engine range covers:

• 4BT & 6BT — the most widely used Cummins engines in compact excavators, light plant, and agricultural machinery
• N14 & M11 — high-torque mid-range platforms trusted in heavy earthmoving and haulage
• ISX, ISX15 & X15 — modern high-output Cummins engines for large excavators and heavy plant
• L10 & 855 — proven legacy configurations with strong global parts and rebuild support
• Big Cam 400 — a high-demand legacy platform for operators running older heavy plant fleets

Every engine is available as a used, rebuilt, or reconditioned unit. All units are cross-referenced to your machine serial number and dispatched with full documentation.

Caterpillar Diesel Engines: New, Used & Remanufactured

Caterpillar diesel engines are the benchmark powerplants for mining, civil construction, and bulk earthmoving equipment worldwide. From the workhorses of the CAT 3300 and 3400 series to the high-performance C-series platforms, Caterpillar engines are precision-built, and when they reach the end of service life or suffer catastrophic failure, precision matters just as much in the replacement.

Our Caterpillar engine range covers:

• C7 & C9 — reliable mid-range CAT platforms for medium excavators and support plant
• C12 & C13 — versatile high-torque engines deployed across a wide range of heavy equipment
• C15 & C15 ACERT — the most widely replaced CAT engine in heavy industry, available as used and rebuilt units
• C16 & C18 — high-output CAT powerplants for the largest excavators and heavy haul applications
• 3306, 3406, 3406E & 3406B — the most rebuilt CAT engines in existence, with unmatched global parts availability
• 3208, 3116 & 3126 — reliable multi-application platforms covering a wide range of machine types

New, used, and remanufactured options are available across the range. OEM specifications are verified, and engine serial numbers are cross-referenced for fitment accuracy before every order ships.

Detroit Diesel Engines: Rebuilt & Used Units

Detroit Diesel engines have built their reputation in the most demanding on-highway and heavy-duty off-road applications in the world. The Series 60 in both 12.7L and 14L configurations remains one of the most recognisable and trusted diesel platforms ever produced. The modern DD-series platforms continue that legacy with advanced fuel efficiency and high torque output suited to heavy haulage and high-cycle plant operations.

Our Detroit Diesel engine range covers:

• DD13 — a modern mid-range Detroit platform for on-highway and medium-duty plant applications
• DD15 — Detroit's most popular current platform, trusted across heavy haulage and large plant equipment
• DD16 — Detroit's highest-output platform for maximum-duty and ultra-heavy applications
• Series 60 (12.7L & 14L) — the legendary Detroit platform with one of the strongest rebuild and parts support networks in the industry

Rebuilt and used units are available across the range, dispatched with documented rebuild specifications and full worldwide delivery capability.

Used, Reconditioned & Rebuilt: Understanding Your Engine Assembly Options

Not all replacement engine assemblies are the same, and choosing the right type for your application matters as much as choosing the right model. At Imara Engineering, we supply three distinct categories of diesel engine assembly:

• Used engines — tested, running units removed from machines with documented service history. The most cost-effective entry point for operators with tighter budgets or shorter required service life expectations.

• Reconditioned engines — used engines that have been inspected, measured, and have key worn components replaced to return the engine to a serviceable standard. A balanced middle ground between cost and reliability.

• Rebuilt engines — fully dismantled, measured, and reassembled with new or remanufactured components throughout, returned to OEM dimensional specifications. The highest reliability option and the closest equivalent to a new engine at a fraction of the price.

Our team will advise on the right option for your machine, your application, and your required service life before you commit to an order.

How to Choose the Right Engine Assembly for Your Machine

Selecting a replacement engine assembly requires more than matching a model name. The key factors that determine a correct and reliable replacement are:

1. Engine serial number — confirms the exact build specification, including any mid-production changes to internal components
2. Machine serial number — confirms the mounting configuration, ancillary drive arrangement, and electrical integration requirements
3. Application and duty cycle — a rebuilt engine specified for light intermittent use is not the right choice for a high-cycle mining excavator
4. Ancillary compatibility — turbocharger, aftercooler, injection pump, and ancillary drive arrangements must match the receiving machine
5. Documentation — rebuild records, parts specifications, and test data, to confirm what has been done to the engine before it arrives on your site

At Imara Engineering, our team works through every one of these factors with you before any engine ships. We do not dispatch until fitment and specification are confirmed.

Why Source Your Engine Assembly from Imara Engineering?

Operators and fleet managers across Australia, North America, Canada, and globally choose Imara Engineering for diesel engine assemblies because we understand that an engine purchase is not a catalogue transaction; it is a critical operational decision.

• OEM-Equivalent Quality — Every engine in our range is held to OEM dimensional and performance standards. Rebuilt and reconditioned does not mean compromised; it means verified engineering integrity at a competitive price.
• Confirmed Fitment on Every Order — Serial number cross-referencing, specification verification, and ancillary compatibility checks are completed before every engine ships. No guesswork, no returns.
• Full Documentation Included — Every engine dispatched by Imara Engineering comes with complete rebuild records, parts specifications, and test data, giving your workshop the information they need before the engine hits the stand.
• Fast Worldwide Dispatch — We ship to Australia, the United States, Canada, and internationally. Fast turnaround on in-stock units with full tracking from dispatch to delivery.
• Broad Model Coverage — Cummins, Caterpillar, and Detroit Diesel across a wide range of configurations from compact three-cylinder units to high-output inline-six powerplants.