Key Takeaways
- The Kubota D1105 is a 3-cylinder, 1.123 L, liquid-cooled diesel engine widely used in construction, agricultural, and industrial equipment-from skid steers and mini excavators to generators and pumps.
- Core specs include around 24–25 hp at 3000 RPM, indirect injection, a compact footprint, and a reputation for reaching 10,000+ hours with proper maintenance.
- Fab Heavy Parts supplies new and remanufactured Kubota D1105 replacement parts, ready to ship across America.
- Before ordering, always check your engine's serial plate, confirm whether your current setup includes or models that exclude cooling fan, and verify the correct emissions tier to ensure a proper match.
Introduction to the Kubota D1105
The Kubota D1105 is one of those engines you'll find just about everywhere in the compact equipment world. Skid steers, mini excavators, trenchers, air compressors, welders, small generators-if it's compact and it runs on diesel, there's a solid chance a D1105 is under the hood.
The D1105 engine is part of Kubota's 05 Series.
The name breaks down simply. "D" means diesel. "1105" points to roughly 1.1 liters of displacement. And the engine is part of Kubota's 05 Series, a product line that has earned a strong following for its reliability across decades of production. The D1105 is a three-cylinder, vertical, liquid-cooled diesel that delivers around 24–25 horsepower in most configurations. That might not sound like a lot on paper, but in a package this compact, it's more than enough to handle serious work.
OEMs keep coming back to the D1105 for good reasons: the engine has a small footprint, proven fuel efficiency, and consistent mounting points that rarely change between emissions upgrades. That kind of stability saves machine builders time and money. For equipment owners and fleet managers, it means parts are widely available and mechanics know how to work on them.
Fab Heavy Parts at fabheavyparts.com specializes in replacement Kubota D1105 engines and components. Whether you're running a rental fleet, managing a municipal crew, or keeping a single machine alive on a job site, the right engine and the right parts make all the difference.
Kubota D1105 Engine Specifications
This section covers the technical specs that buyers and mechanics actually need when evaluating, ordering, or comparing a D1105. If you're matching a replacement engine or just checking your current setup against factory numbers, this is where to start.
|
Specification |
Value |
|
Engine Type |
4-cycle, vertical, water-cooled diesel |
|
Number of Cylinders |
3 |
|
Displacement |
1.123 L (68.5 cu in) |
|
Bore × Stroke |
78.0 mm × 78.4 mm (3.07 × 3.09 in) |
|
Aspiration |
Naturally aspirated (standard) |
|
Combustion System |
Indirect injection |
|
Fuel System |
In-line injection pump |
|
Rated Power (Gross) |
~18.5 kW / 24.8 HP @ 3000 RPM |
|
Rated Power Range (All Variants) |
18.5 to 32.9 HP |
|
Max Torque |
~71.5 Nm (52.7 lb-ft) @ 2200 RPM |
|
Compression Ratio |
22.0:1 or 24.0:1 (varies by model) |
|
Valve Train |
OHV, 2 valves per cylinder |
|
Dimensions (L × W × H) |
~480 × 396 × 605 mm (18.9 × 15.6 × 23.8 in) |
|
Dry Weight |
~93 kg (approx. 205 lb) |
|
Cooling |
Liquid-cooled |
The engine features an indirect injection combustion system.
A few things to keep in mind. The dimensions listed above typically exclude the cooling fan and aftertreatment unit, so your installed package may be slightly larger depending on accessories. The rated power of the D1105 ranges from 18.5 to 32.9 HP depending on the variant-naturally aspirated versions sit at the lower end, while turbocharged models push toward the top. The engine operates at 3000 RPM in most industrial applications, though generator-spec versions run at lower speeds like 1800 RPM.
The bore and stroke dimensions-78.0 mm bore and 78.4 mm stroke-are nearly square, which contributes to smooth operation and good torque characteristics. The dry weight of approximately 93 kg makes this one of the lighter engines in its power class, which is a major reason it fits into so many tight machine compartments.
Specs can also shift slightly based on emissions tier. Earlier Tier 2 builds and later EPA Tier 4 / EU Stage V versions share the same displacement and bore/stroke but may differ in compression ratio, net power output, and included accessories.
Performance, Fuel Economy & Applications
In real-world use, the D1105 is known for strong low-end torque and smooth, relatively quiet operation. For a small diesel, it's well-behaved. Operators running light-duty tasks-pumping, backup power generation, or utility vehicle work-report stable idle and minimal vibration. Under moderate to heavy loads like trenching or operating a skid steer, the engine responds with solid torque without feeling strained.
Fuel consumption varies by load, but the D1105 is generally considered efficient for its class. Under light duty, expect roughly 1 gallon per hour or less. Heavier applications push that closer to 2 gallons per hour. For rental fleets and contractor crews running machines all day, that efficiency translates directly into lower operating costs and longer intervals between fill-ups.
The D1105 is used in industrial, construction, and agricultural applications across a wide range of equipment:
- Compact tractors (including Kubota's own models)
- Mini excavators and skid steers
- Trenchers and stump grinders (Vermeer, Toro, and similar)
- Air compressors and welders
- Small generators and pump sets
- Utility and turf maintenance vehicles
The D1105 is often used in small tractors, generators, and compact construction machinery where space is tight but dependable power is non-negotiable. In generator-spec BG configurations, the engine runs at 1800 RPM and produces lower continuous output-some variants rated around 9.2 horsepower net for sustained duty cycles-making it well-suited for standby and portable genset applications.
OEMs stick with the D1105 platform year after year because it offers stable parts availability, a consistent mounting pattern across emissions upgrades, and proven durability in tough environments. When a machine builder can upgrade from Tier 2 to Tier 4 without redesigning the chassis, that's a significant engineering advantage.
Emissions, Noise & Environmental Features
Later versions of the D1105 were updated to meet increasingly strict emissions regulations without drastically changing the engine's size or mounting points. That's a bigger deal than it sounds-many OEMs were able to transition machines from one emissions tier to the next with minimal redesign.
Here's how the emissions progression breaks down:
- EPA Tier 2 / EU Stage IIIA: Earlier D1105 models (like the D1105-E2B) were built to meet these standards, which became common in the mid-2000s. The D1105 engine complies with EU Stage IIIA emissions regulations in these configurations.
- EPA / CARB Interim Tier 4: More recent naturally aspirated versions meet EPA interim Tier 4 standards, reducing allowable particulate matter and NOx further.
- EPA Tier 4 / EU Stage V: The latest builds, including the D1105-E4B and the turbocharged D1105-T, achieve full compliance. The D1105 Turbocharged engine complies with EPA Tier 4 regulations.
A key technology behind these improvements is Kubota's E-TVCS (Three Vortex Combustion System). In simple terms, E-TVCS optimizes airflow inside the combustion chamber so fuel burns more completely. The D1105 utilizes E-TVCS technology to improve fuel efficiency and reduce emissions. The result is lower smoke, better fuel economy, and the D1105 engine maintains low particulate matter levels-all without adding a bulky exhaust aftertreatment system on most naturally aspirated versions.
Noise levels are another advantage. Compared to older small diesels, the D1105 runs quieter, which matters for rental yards, municipalities, and job sites near residential areas or indoor environments.
When ordering a replacement, buyers should match the emissions tier of the new engine to the original certification on their equipment. Fab Heavy Parts can help decode serial numbers and data plates to ensure you get the correct configuration.
Common Variants & Configurations (Including Fan & Accessories)
The same basic D1105 block comes in multiple configurations depending on the application and emissions requirements. Understanding the differences before you order a replacement can save real headaches during installation.
Key variants include:
- D1105 (naturally aspirated): The standard configuration, delivering around 24–25 HP at 3000 RPM. Available in Tier 2 through Tier 4 emissions builds.
- D1105-T (turbocharged): Boosts output to approximately 32.9 HP at 3000 RPM. The D1105T has a turbo and lower compression ratio compared to the highest-compression naturally aspirated versions. The D1105 engine can be upgraded to a D1105T, but turbocharging may require beeded-up internal engine parts such as stronger connecting rods and pistons to handle the increased cylinder pressures. Importantly, avoid adding a turbo to the 24:1 compression version-the combination of high compression and forced industion creates dangerous cylinder pressures.
- D1105-BG (generator spec): Configured for continuous or standby power at 1800 RPM with specific flywheels, housings, and governor settings tuned for steady electrical output.
- D1105-K (electronic): Kubota's newest variant featuring electronic control, CAN bus communication, and TVCR combustion technology for improved emissions, roughly 5% better fuel economy, and extended oil change intervals.
When it comes to what's included with a replacement engine, pay close attention. Some units ship as "bare long blocks"-the block, head, and crankshaft with no external accessories. Others are "complete drop-in" packages that include the injection pump, starter, alternator, intake and exhaust manifolds, and sometimes a radiator package.
One common catch: certain replacement D1105 engines exclude cooling fan and fan hub because OEM equipment typically reuses the original fan and shroud from the machine. If you're ordering a replacement, verify whether your unit comes with a fan or if you need to transfer yours over. Mismatched fan size or shroud geometry can lead to cooling problems from day one.
Fab Heavy Parts can supply D1105 engines in multiple configurations-with or without accessories, with specific front covers or flywheel housings-to match skid steer, mini excavator, generator, and pump applications.
Maintenance, Reliability & Typical Service Life
The D1105 has a well-earned reputation for longevity. With disciplined service intervals, these engines routinely deliver several thousand hours of reliable operation. The D1105 can operate for 10,000+ hours with proper maintenance-a figure that's not unusual in rental fleets and municipal operations where machines are maintained on schedule without exception.
Core maintenance tasks and typical intervals:
|
Task |
Typical Interval |
|
Engine oil and filter change |
Every 250–500 hours (see note below) |
|
Fuel filter replacement |
Every 500 hours |
|
Air filter inspection/replacement |
Every 200–500 hours (more often in dusty conditions) |
|
Coolant system service |
Annually or per Kubota schedule |
|
Valve lash check |
Every 1,500–2,000 hours |
|
The engine's oil change interval can be extended up to 500 hours on certain configurations like the D1105-K, which uses a larger oil pan designed for longer service cycles under light to moderate duty. For standard versions, most operators stick closer to 250 hours. |
|
As hours build up, common wear points include:
- Injector nozzle wear: Dirty fuel or neglected fuel filter changes accelerate this. Symptoms include rough running, smoke, and power loss.
- Cooling system neglect: Blocked radiators, failed thermostats, or worn water pumps are among the leading causes of D1105 failures. Overheating kills head gaskets and can crack blocks.
- Hard starting: Usually traced to degraded glow plugs or low compression from ring and cylinder wear.
Following Kubota's service schedule can dramatically extend engine life, reduce unplanned downtime, and protect the resale value of your equipment. Using genuine parts for filters, gaskets, and injectors ensures proper fit and function-aftermarket knockoffs may save a few dollars upfront but often lead to premature wear or poor sealing.
Fab Heavy Parts stocks key service parts and major components for D1105 engines and can advise shops on whether a rebuild or full replacement makes more sense for a given situation.
FAQ
Q1: How do I confirm that my machine actually has a Kubota D1105?
A1: Look for the engine data plate or stamped identification on the side of the block, near the injection pump, or on a tag attached to the valve cover. The plate should list the full model designation (such as D1105-E3B or D1105-T) along with the serial number and emissions information. Cross-check this against your equipment's owner manual or service documentation. Many compact machines use similar-looking Kubota 05 Series engines with different displacements-like the D902 or D1305-so verifying the exact code is critical before ordering a replacement. Write down the full model, serial number, and emissions label, then share those details with Fab Heavy Parts to confirm the correct match.
Q2: Can I swap a different Kubota 05 Series engine in place of a D1105?
A2: While some 05 Series engines share similar external dimensions and mounting footprints, differences in displacement, emissions tier, wiring, exhaust routing, and cooling configurations mean a direct swap is not guaranteed. Moving from a D1105 to a D1305 or D902, for example, could require changes to the ECU, throttle controls, exhaust system, and sometimes the radiator or fan setup.
Q3: What's the typical lifespan of a Kubota D1105 befoe major overhaul?
A3: With good maintenance-clean fuel, regular oil and filter changes, proper coolant levels-a D1105 commonly reaches several thousand hours before needing significant internal work. Some operators in light-duty applications report reaching well beyond 10,000 hours. Fuel quality, dust exposure, load severity, and adherence to service intervals all have a major impact. If you're unsure whether your engine needs an overhaul or a full replacement, compression tests, oil analysis, and blow-by checks can help you make an informed decision.
Q4: Does Fab Heavy Parts stock parts for older non-Tier 4 D1105 engines?
A4: Yes. Fab Heavy Parts supports earlier emissions versions of the D1105 with core components including pistons, liners, gaskets, oil pumps, and injectors. Some external or emissions-related parts may differ by production year and tier, so having your serial number and emissions label on hand helps ensure a correct match. If you're looking for hard-to-find components for a legacy D1105-powered machine, reach out to the Fab Heavy Parts team-they can track down what you need or suggest compatible alternatives.
Q5: What should I check on my cooling system when installing a new D1105?
A5: Before firing up a new or remanufactured D1105, inspect the radiator for blockage or damage, check all coolant hoses for cracks and swelling, and verify that the thermostat and water pump are functioning properly. Replace any worn items before running the new engine-installing a fresh engine into a compromised cooling system is a fast path to overheating and warranty headaches. Verify whether your replacement engine includes or models that exclude cooling fan and fan hub, and transfer or replace the fan as needed to match your machine's shroud and airflow requirements. Use the correct coolant mix per Kubota's specification, and bleed all air from the system thoroughly before startup to protect your new Kubota D1105 investment.
FAB Heavy Parts: Your Trusted Engine Parts Supplier
Welcome to Fab Heavy Parts' online catalog, your trusted source for quality auto parts and tools. Explore our extensive selection of replacement parts for Kubota D1105 Engine and more. Avoid delays by securing the parts you need from a reliable supplier who keeps inventory moving. Our expert team is here to provide personalized support, ensuring you get the right parts. Reach out today to stay ahead and keep your operations seamless!