Kubota D1402 Parts and Parts Manual PDF

Kubota D1402 Parts

The Kubota D1402 is a sub-compact diesel tractor that is perfect for small farms, estates, and hobbyists. It is powered by a 14.9 HP Kubota ETVCS engine that is liquid-cooled and meets Tier 4 Final emission standards.

The D1402 has a hydrostatic transmission with cruise control, making it easy to operate. It also features four-wheel drive and a rear differential lock for improved traction in tough conditions.

The D1402 has a lift capacity of 772 pounds and a three-point hitch, making it ideal for attaching implements such as mowers, tillers, and snow blowers. It also has a PTO (power take-off) for powering implements such as generators and wood chippers.

Kubota D1402 Specs

  1. Displacement: The D1402 has a displacement of approximately 1.4 liters (or 1,372 cubic centimeters).
  2. Power Output: The power output of the D1402 engine can vary depending on its application and the specific model it’s installed in. Typically, it can produce around 20-25 horsepower (hp) at its peak performance.
  3. Fuel System: The engine employs a direct injection fuel system, which helps optimize fuel efficiency and performance.
  4. Cooling System: It features a liquid-cooling system to maintain optimal operating temperatures, ensuring efficient performance and longevity of the engine.
  5. Aspiration: The D1402 engine typically uses a natural aspiration method, meaning it doesn’t employ a turbocharger or supercharger to force air into the cylinders.
  6. Cylinder Configuration: It has four cylinders arranged in-line, which helps in achieving smooth operation and balanced power delivery.
  7. Compression Ratio: The compression ratio of the D1402 engine is usually in the range of 20:1, which is common for diesel engines and contributes to their efficiency.
  8. Dimensions and Weight: The engine is compact and lightweight, making it suitable for various applications where space and weight are considerations.
  9. Emissions: Depending on the model and year of manufacture, the D1402 engine may comply with different emissions standards, such as Tier 4 Final or earlier versions, in accordance with regulatory requirements.

Kubota D1402 Engine Manual

Sections :

  1. Introduction: This section provides an overview of the manual, including a brief introduction to the engine model, its applications, and the intended audience (e.g., operators, technicians, etc.).
  2. Safety Precautions: It’s common for manuals to start with a section on safety precautions. This part outlines important safety guidelines and practices to follow when working with or around the engine to prevent accidents or injuries.
  3. Specifications: The specifications section details the technical specifications of the engine, including dimensions, weight, power output, torque, fluid capacities, and other relevant data.
  4. Operating Instructions: This section provides instructions on how to properly operate the engine, including starting procedures, throttle control, operating temperatures, and general operating guidelines.
  5. Maintenance Procedures: Maintenance procedures are crucial for ensuring the longevity and reliability of the engine. This section typically includes information on routine maintenance tasks such as oil changes, filter replacements, cooling system maintenance, and other scheduled service intervals.
  6. Troubleshooting Guide: In the troubleshooting section, you’ll find guidance on diagnosing and troubleshooting common problems or issues that may arise during the engine’s operation. This can include symptoms, possible causes, and recommended solutions.
  7. Parts Diagrams and Lists: Parts diagrams and lists provide visual references and part numbers for various components of the engine. This section is useful for identifying parts, ordering replacements, and performing repairs.
  8. Wiring Diagrams (if applicable): For engines with electrical systems, wiring diagrams may be included to assist with diagnosing electrical issues or making electrical connections.
  9. Service and Repair Procedures: Detailed service and repair procedures are provided for more complex maintenance tasks, component replacements, and engine overhaul procedures. This section may include step-by-step instructions, illustrations, and specifications for each procedure.
  10. Storage and Transportation: Guidelines for proper storage and transportation of the engine, including long-term storage procedures and precautions to take during transportation.
  11. Warranty Information: The manual may also include warranty information, such as warranty coverage, terms, and conditions.

Kubota D1402 Crankshaft

The crankshaft is a vital component of the Kubota D1402 engine, responsible for converting the reciprocating motion of the pistons into rotational motion, which drives the engine’s output shaft.

  1. Material: Crankshafts are typically made from high-strength alloy steel to withstand the stresses and loads encountered during engine operation.
  2. Construction: The crankshaft of the Kubota D1402 is usually a forged or cast piece with precision-machined bearing surfaces and journal diameters. It’s designed to be durable and reliable under various operating conditions.
  3. Main Bearings: The crankshaft is supported by main bearings housed in the engine block. These bearings reduce friction and support the crankshaft’s rotational motion. Proper lubrication is essential to ensure longevity and smooth operation.
  4. Rod Bearings: The connecting rods, which connect the pistons to the crankshaft, also have bearings to facilitate smooth reciprocating motion. These rod bearings are subjected to high loads and require proper lubrication and maintenance.
  5. Counterweights: The crankshaft is often equipped with counterweights strategically placed to balance the forces generated by the reciprocating motion of the pistons. This balancing reduces vibrations and ensures smooth engine operation.
  6. Keyway: The crankshaft typically has a keyway or spline machined into one end to facilitate connection to the engine’s output shaft, such as the flywheel or timing gears.
  7. Seal Surfaces: The crankshaft features seal surfaces where seals are installed to prevent oil leakage from the crankcase. Proper sealing is crucial to maintain oil pressure and prevent contamination of the engine oil.
  8. Dynamic Balancing: Crankshafts are dynamically balanced during manufacturing to minimize vibrations and ensure smooth engine operation. Imbalances can lead to excessive wear, noise, and decreased engine performance.
  9. Crankshaft Position Sensor (CPS): Some engines, including the Kubota D1402, may feature a crankshaft position sensor mounted on the crankshaft. This sensor provides feedback to the engine control unit (ECU) for precise ignition timing and fuel injection.

Kubota D1402 Rebuild Kit

A rebuild kit for the Kubota D1402 engine typically includes a comprehensive set of parts necessary for overhauling or rebuilding the engine. These kits are commonly used when the engine has reached the end of its service life or has experienced significant wear or damage. Here are the components found in a rebuild kit for the Kubota D1402:

  1. Pistons and Piston Rings: These are essential for sealing the combustion chamber and transferring energy from the expanding gases to the crankshaft. Piston rings help maintain compression and control oil consumption.
  2. Cylinder Liners or Sleeves: Cylinder liners are cylindrical components that fit inside the engine block and provide a smooth surface for the piston to move up and down. In some cases, the rebuild kit may include replacement liners if the existing ones are worn or damaged.
  3. Main Bearings and Rod Bearings: Main bearings support the crankshaft within the engine block, while rod bearings support the connecting rods on the crankshaft. These bearings are crucial for reducing friction and ensuring smooth operation.
  4. Gasket Set: A complete gasket set typically includes all the gaskets, seals, and o-rings needed to reseal the engine during reassembly. This includes head gaskets, valve cover gaskets, oil seals, and various other seals required for the engine’s components.
  5. Piston Pins and Retainers: Piston pins (wrist pins) connect the pistons to the connecting rods. They may be included in the rebuild kit along with retaining clips or other hardware.
  6. Connecting Rod Bushings: These bushings are installed in the small end of the connecting rods and provide a smooth surface for the piston pins to rotate.
  7. Timing Components: Timing components such as timing belts, timing chains, tensioners, and guides may be included if the engine has a timing belt or chain that needs replacement during the rebuild process.
  8. Gasket Maker or Sealant: Some rebuild kits may include gasket maker or sealant for specific applications where a traditional gasket is not used.
  9. Engine Bearings and Thrust Washers: Depending on the engine design, the rebuild kit may include additional bearings and thrust washers for other components such as the camshaft or balance shafts.
  10. Optional Components: Depending on the supplier and the specific needs of the rebuild, other components such as valve guides, valve stem seals, camshaft bushings, or piston pin bushings may be included.

Kubota D1402 Replacement Engine

If you’re considering replacing the Kubota D1402 engine in your equipment, there are several options:

  1. New OEM Engine: You can purchase a brand-new Kubota D1402 engine directly from Kubota or an authorized dealer. This option ensures that you’re getting a genuine Kubota engine with factory specifications and warranty coverage.
  2. Remanufactured Engine: Remanufactured engines are rebuilt to OEM specifications using genuine Kubota parts. They undergo a thorough inspection, repair, and testing process to ensure quality and reliability. Remanufactured engines can be a cost-effective alternative to a new engine while still offering excellent performance and durability.
  3. Rebuilt Engine: If you prefer to have your existing engine rebuilt, you can hire a qualified mechanic or engine rebuild shop to disassemble, inspect, and repair the engine as needed. This option allows you to retain your original engine block and components while replacing worn or damaged parts.
  4. Aftermarket Engine: There are aftermarket manufacturers that produce replacement engines compatible with the Kubota D1402. These engines may offer similar performance and specifications to the original Kubota engine but may vary in quality and warranty coverage. It’s essential to research and choose a reputable aftermarket supplier if you decide to go this route.
  5. Salvage Yard or Used Engine: You may be able to find a used Kubota D1402 engine from a salvage yard or through private sellers. While used engines can be more affordable, they may have higher mileage or unknown history, so thorough inspection and testing are recommended before installation.

Kubota D1402 Engine Parts List

  1. Pistons: These are responsible for compressing the air-fuel mixture within the cylinder and transferring energy to the crankshaft.
  2. Piston Rings: Piston rings seal the combustion chamber, regulate oil consumption, and transfer heat from the piston to the cylinder wall.
  3. Cylinder Liners or Sleeves: These are cylindrical inserts in the engine block that provide a smooth surface for the piston to move and help dissipate heat.
  4. Connecting Rods: Connecting rods connect the pistons to the crankshaft, transmitting motion from the pistons to the crankshaft.
  5. Crankshaft: The crankshaft converts the reciprocating motion of the pistons into rotational motion, which drives the engine’s output shaft.
  6. Camshaft: The camshaft controls the opening and closing of the engine’s valves, timing their operation with the piston’s movement.
  7. Valves: Valves regulate the flow of air and fuel into the combustion chamber and the exhaust gases out of the chamber.
  8. Valve Springs and Retainers: These components keep the valves closed and ensure they return to their closed position after opening.
  9. Timing Components: Timing components include timing belts, timing chains, tensioners, and guides, which ensure the proper synchronization of the engine’s valves and pistons.
  10. Gaskets and Seals: Gaskets and seals prevent fluid and gas leaks between engine components, such as the cylinder head gasket, valve cover gasket, and oil seals.
  11. Bearings: Bearings support moving parts within the engine, such as the crankshaft bearings, rod bearings, and camshaft bearings.
  12. Oil Pump: The oil pump circulates engine oil to lubricate moving parts and remove heat from the engine.
  13. Cooling System Components: These include the water pump, radiator, hoses, and thermostat, which regulate the engine’s operating temperature.
  14. Fuel System Components: Fuel system components include the fuel injectors, fuel pump, fuel filters, and injector nozzles, which deliver fuel to the combustion chambers.
  15. Electrical Components: Electrical components include the starter motor, alternator, ignition system components, and sensors, which monitor and control various engine functions.

Kubota D1402 Valve Clearance

The Kubota D1402 engine has the following valve clearance specifications:

  • Intake Valve Lash: 0.007 – 0.009 in (0.178 – 0.229 mm) Cold
  • Exhaust Valve Lash: 0.007 – 0.009 in (0.178 – 0.229 mm) Cold

Important Notes:

  • Always refer to your Kubota D1402 service manual for the most accurate and up-to-date valve clearance specifications and adjustment procedures. These specifications may vary depending on the year and model of your engine.
  • Adjusting valve clearances requires specific tools and knowledge. If you are not comfortable performing this task yourself, it is recommended that you take your tractor to a qualified mechanic.
  • It is important to adjust the valve clearances on a regular basis, as specified in your service manual. This helps to ensure optimal engine performance and fuel efficiency.

Kubota D1402 Injectors and Injector Pump

The Kubota D1402 utilizes direct injection diesel fuel delivery, meaning the injectors spray fuel directly into the engine cylinders.


  • Type: The D1402 most likely uses single-hole mechanical injectors, though specific details depend on your engine variant and year.
  • Nozzle size: Information on the exact nozzle size might be unavailable online and is best retrieved from your service manual or by contacting Kubota directly.
  • Testing and cleaning: While some basic cleaning at home is possible, thorough testing and servicing of injectors require specialized equipment and expertise. Consult your service manual or a qualified mechanic for proper procedures.
  • Replacement: Replacement injectors are available from Kubota dealerships and various online retailers. Ensure you get the correct part number that matches your specific engine version.

Injector Pump:

  • Type: The D1402 uses a mechanical injection pump.
  • Adjustment: Like valve clearances, adjusting the injection pump requires specific tools and knowledge. Refer to your service manual or seek professional help for any adjustments.
  • Replacement: Injector pumps are more complex components and replacing them yourself might not be recommended. Consider seeking professional assistance unless you have significant experience with diesel engines.

Additional Resources:

  • Kubota D1402 Service Manual: This crucial resource provides detailed information on injector testing, cleaning, and replacement procedures specific to your engine model.
  • Kubota Dealer: Your local Kubota dealer can offer genuine parts, technical advice, and potentially injector servicing or replacement.
  • Diesel Injection Specialist: A specialized mechanic experienced with diesel engines can provide expert diagnosis, repair, and replacement of injectors and pumps.

Kubota D1402 Used Engine

The Kubota D1402 is a 3-cylinder, liquid-cooled diesel engine that was used in a variety of small tractors, compact construction equipment, and generators. It is known for its reliability, durability, and fuel efficiency. If you’re looking for a used Kubota D1402 engine, there are a few things to keep in mind:

  • Mileage: The amount of time the engine has been used is a good indicator of its overall condition. A lower mileage engine is likely to be in better condition than a higher mileage engine.
  • Condition: Be sure to carefully inspect the engine for any signs of damage or wear. Look for leaks, cracks, and excessive rust.
  • Price: Used Kubota D1402 engines can range in price from a few hundred dollars to a few thousand dollars, depending on the factors mentioned above.

Here are some places where you can find used Kubota D1402 engines:

  • Online marketplaces: There are a number of online marketplaces where you can find used Kubota D1402 engines, such as eBay, Craigslist, and TractorHouse.
  • Kubota dealerships: Some Kubota dealerships may sell used engines.
  • salvage yards: You may be able to find a used Kubota D1402 engine at a salvage yard.

Here are some additional tips for buying a used Kubota D1402 engine:

  • Do your research: Read up on the Kubota D1402 engine to learn about its common problems and how to spot them.
  • Ask questions: Be sure to ask the seller plenty of questions about the engine, such as its mileage, condition, and why it is being sold.
  • Get it in writing: Get any agreements you make with the seller in writing.

Kubota D1402 Head Gasket

The Kubota D1402 engine uses a composite head gasket. This type of gasket is made of multiple layers of different materials, each with its own specific properties. The composite construction helps to ensure a good seal between the cylinder head and the engine block, even under high temperatures and pressures.

  • Coolant in the oil: If you see coolant mixed in with the engine oil, it is a strong indication that the head gasket is failing.
  • White smoke from the exhaust: This can be caused by coolant leaking into the combustion chamber.
  • Overheating: A blown head gasket can prevent the engine from cooling properly, which can lead to overheating.
  • Loss of power: If the head gasket is not sealing properly, it can cause compression to leak out of the cylinders, which can lead to a loss of power.

If you suspect that your Kubota D1402 engine has a bad head gasket, it is important to have it repaired immediately. Replacing a head gasket is a complex job that should only be performed by a qualified mechanic.

Here are some additional tips for maintaining the head gasket on your Kubota D1402 engine:

  • Use the correct coolant: Make sure you are using the type of coolant that is recommended by Kubota for your engine.
  • Maintain the cooling system: Regularly check the coolant level and make sure the cooling system is functioning properly.
  • Avoid overheating: Never let your engine overheat, as this can damage the head gasket.
  • Don’t modify the engine: Modifying the engine can put additional stress on the head gasket and lead to failure.

Kubota D1402 Oil Filter, Oil Change, Oil Capacity

Oil Filter:

  • The recommended oil filter for the Kubota D1402 is Kubota Genuine Oil Filter 700036. However, compatible aftermarket filters with matching specifications might be available.

Oil Change:

  • Frequency: Consult your Kubota D1402 Operator’s Manual for the recommended oil change intervals. It typically depends on operating conditions and workload, but generally falls within the range of 50 hours for the first service and then every 400 hours thereafter.
  • Oil Type: Use a high-quality diesel engine oil that meets the API CI-4 or CJ-4 specification. Refer to your manual for the recommended viscosity grade based on your operating temperature range.
  • Capacity: The Kubota D1402 engine has an oil capacity of approximately 2.4 liters (2.5 quarts). However, it’s best to consult your specific manual for the exact amount as there might be slight variations depending on the model year.

Oil Change Procedure:

  1. Warm up the engine: Run the engine for a few minutes to warm up the oil and make it easier to drain.
  2. Prepare the drain pan: Place a drain pan under the engine oil drain plug.
  3. Drain the oil: Locate the engine oil drain plug and remove it carefully using a wrench. Allow the oil to drain completely into the drain pan.
  4. Replace the oil filter: Remove the old oil filter and replace it with a new one. Tighten the new filter hand-tight only. Do not over tighten.
  5. Refill the oil: Add the specified amount of fresh engine oil, checking the dipstick regularly to avoid overfilling.
  6. Start the engine: Start the engine and let it run for a few minutes. Check for leaks around the oil drain plug and filter.
  7. Re-check oil level: Turn off the engine and let it sit for a few minutes to allow the oil to settle. Then, recheck the oil level on the dipstick and add more oil if necessary to reach the recommended level.

Additional Tips:

  • Dispose of used oil and filters responsibly at a designated recycling facility.
  • Always use genuine Kubota parts or high-quality aftermarket parts that meet the manufacturer’s specifications.
  • Regularly check your engine oil level between oil changes.

Kubota D1402 Thermostat Housing

The Kubota D1402 thermostat housing is a crucial component of the engine’s cooling system. It houses the thermostat, which regulates the flow of coolant and maintains the optimal engine operating temperature.

  • The thermostat housing contains the thermostat, which opens and closes based on engine temperature. When the engine is cold, the thermostat remains closed, allowing coolant to circulate only within the engine block, facilitating faster warm-up.
  • As the engine reaches operating temperature, the thermostat gradually opens, allowing coolant to flow through the radiator, where it is cooled by air flowing through the fins.
  • This regulated flow of coolant ensures the engine maintains a consistent operating temperature, preventing overheating and engine damage.


  • The thermostat housing is typically located on the cylinder head or engine block, near the water inlet pipe from the radiator.


  • The thermostat housing is usually made of cast aluminum or plastic.
  • It has a flange that mounts to the engine block or head, and a connection point for the radiator hose.
  • Some thermostat housings also incorporate a bypass passage that allows some coolant to circulate even when the thermostat is closed.


  • If the thermostat housing cracks, leaks, or becomes damaged, it needs to be replaced.
  • It’s recommended to replace the thermostat along with the housing, as they often wear out together.
  • Consult your Kubota D1402 service manual for specific instructions on replacing the thermostat housing.

Additional Tips:

  • Use genuine Kubota parts or high-quality aftermarket parts that meet the manufacturer’s specifications.
  • Check your coolant level regularly and ensure it’s always at the recommended level.
  • Flush the cooling system periodically to remove any debris or rust that could clog the thermostat housing or radiator.

Kubota D1402 Water Coolant

The Kubota D1402 engine uses a liquid-cooled system to regulate its temperature and prevent overheating:

Coolant Type:

  • Kubota recommends using a 50/50 mixture of ethylene glycol coolant and clean, demineralized water for the D1402 engine. Pre-mixed coolants specifically formulated for diesel engines are also acceptable.
  • Do not use plain water as it can freeze in cold weather, boil at lower temperatures, and offer inadequate corrosion protection.

Coolant Specifications:

  • The coolant should meet the ASTM D3306 specification for extended life and corrosion protection.
  • Some manufacturers offer coolants specific for Kubota engines, which adhere to the manufacturer’s specifications and might offer additional benefits.

Coolant Maintenance:

  • Check the coolant level regularly: Look at the coolant reservoir or overflow bottle to ensure the level is between the recommended markers. Add coolant if necessary.
  • Change the coolant periodically: Consult your Kubota D1402 Operator’s Manual for the recommended coolant change interval. It typically falls within the range of 2 years or 500 hours, whichever comes first.
  • Flush the cooling system periodically: Flushing removes contaminants and helps maintain optimal coolant flow and heat transfer. Consult your manual for flushing instructions and intervals.

Kubota D1702 Problems :

Common problems reported with the Kubota D1402 engine include:

  1. Overheating: Overheating can occur due to various reasons such as coolant leaks, a malfunctioning thermostat, clogged radiator, or insufficient coolant levels. It’s essential to address overheating issues promptly to prevent engine damage.
  2. Starting Problems: Starting problems can be caused by issues with the fuel system, such as air in the fuel lines, clogged fuel filters, or problems with the fuel injectors. Electrical issues, such as a weak battery or faulty starter motor, can also contribute to starting problems.
  3. Low Power or Performance: Low power or decreased engine performance can result from issues such as fuel system problems, worn or damaged engine components (e.g., piston rings, valves, or bearings), or improper engine timing.
  4. Excessive Smoke: Excessive smoke from the exhaust can indicate various problems, including worn piston rings, damaged valves or valve seals, over-fueling, or incomplete combustion due to issues with the fuel injection system.
  5. Oil Leaks: Oil leaks can occur from various engine components, including gaskets, seals, or worn piston rings. It’s essential to identify and repair oil leaks promptly to prevent loss of lubrication and potential engine damage.
  6. Coolant Leaks: Coolant leaks can occur from the radiator, hoses, water pump, or cylinder head gasket. Coolant leaks should be addressed promptly to prevent engine overheating and potential damage to internal components.
  7. Excessive Vibration or Noise: Excessive vibration or unusual noises from the engine can indicate problems such as worn bearings, misaligned components, or internal engine damage.
  8. Fuel Contamination: Fuel contamination, such as water or debris in the fuel system, can lead to engine performance issues, including rough idling, misfiring, or stalling.
  9. Exhaust System Issues: Problems with the exhaust system, such as a clogged muffler or exhaust pipe, can restrict exhaust flow and affect engine performance.
  10. Electrical Problems: Electrical issues, such as faulty sensors, wiring problems, or a malfunctioning ECU (Engine Control Unit), can cause various engine performance issues and should be diagnosed and repaired by a qualified technician.