Part of the Kubota Repair Manuals.
This is the Kubota workshop manual for the EA300-E2-NB1, EA300-E2-NB1-APU, EL300-E2-AR, and EL300-E2-AR-KCL diesel engines, the E2 emission-tier singles built around Kubota's E-TVCS combustion system. All share a 309 cc displacement.It is a full service manual: specifications, performance curves, dimensions, and engine identification up front, then general service precautions and the maintenance schedule, followed by system-by-system diagnosis and repair for the engine body, lubricating, cooling, intake and exhaust, fuel, and electrical systems. A troubleshooting chapter, servicing specifications, and tightening torque tables back it up, with full disassembly, checking, and servicing procedures for the cylinder head, pistons, crankshaft, timing gears, liners, oil pump, and starter.With it you can measure compression, set valve clearance and injection timing, bleed and test the fuel system, rebuild the starter, and torque every fastener to spec.
What's Inside This Kubota EA300-E2-NB1, EA300-E2-NB1-APU, EL300-E2-AR, EL300-E2-AR-KCL Manual
| System | Pages | Key Topics |
|---|---|---|
| Safety First | - | - |
| Specifications | - | EA300-E2-NB1 Specifications, EA300-E2-NB1-Apu Specifications, EL300-E2-Ar Specifications, EL300-E2-Ar-Kcl Specifications |
| Performance Curves | - | EA300-E2-NB1 and EA300-E2-NB1-Apu Performance Curves, EL300-E2-Ar and EL300-E2-Ar-Kcl Performance Curves, Performance Curve Correction Standard |
| Dimensions | - | EA300-E2-NB1 Dimensions, EA300-E2-NB1-Apu Dimensions, EL300-E2-Ar Dimensions, EL300-E2-Kcl Dimensions, Pulley Shaft, V-Pulley, Flywheel |
| Engine Identification | - | Model Name and Engine Serial Number, Year of Manufacture Table, Month of Manufacture Table |
| General Precautions | - | Parts Arrangement During Disassembly, Use of Genuine Special Tools, Disconnecting Grounding Cable, Cleaning Parts Before Measuring, Use of Genuine Parts for Replacement |
| E2 Engine | - | Emission Control Regulations, E2 Model Name Designation, After-Sale Services for E2 Engines |
| Maintenance Check List | - | Maintenance Schedule Table, Lubricating Oil Information, Lubricating Oil Class Table, Lubricating Oil Recommendation for Fuel Types |
| Check and Maintenance | - | Daily Check List, Check Points of Every 50 Hours, Check Points of Every 100 Hours |
| Special Tools | - | Special Use Puller Set, Piston Ring Compressor, Piston Ring Tool, Wet Liner Puller, Socket Wrench 29, Flywheel Puller, Red Check, Radiator Tester |
| Feature | - | EA300 Engine Overview, Engine Type and Cooling, Kubota Technologies Incorporated, E-Tvcs Combustion System and Injection Pump |
| Engine Body | - | Compression Pressure, Decompression Device, Valve Clearance, Top Clearance |
| Lubricating System | - | Engine Oil Pressure |
| Cooling System | - | Fan Belt Tension, Radiator Water Tightness, Radiator Cap Air Leakage |
| Intake / Exhaust System | - | General, Air Cleaner, Muffler |
| Fuel System | - | Injection Timing, Pump Element Fuel Tightness, Delivery Valve Fuel Tightness, Fuel Injection Pressure, Fuel Tightness of Nozzle Valve Seat, Nozzle Spraying Condition |
| Electrical System | - | Fan Dynamo Performance, Starter, Glow Plug |
| Troubleshooting | - | Engine Does Not Start, Engine Revolution Not Smooth, White or Blue Exhaust Gas Observed, Black or Dark Gray Exhaust Gas Observed, Deficient Output |
| Servicing Specifications | - | Engine Body Specifications, Lubricating System Specifications, Cooling System Specifications, Fuel System Specifications, Electrical System Specifications |
| Tightening Torques | - | Tightening Torques for Special Use Screws, Bolts and Nut, Tightening Torques for General Use Screws, Screw and Bolt Material Grades |
| Checking, Disassembling and Servicing | - | Engine Body (Compression Pressure, Decompression Device, Valve Clearance, Top Clearance), Lubricating System (Engine Oil Pressure) |
| Servicing | - | Cylinder Head and Valves, Piston and Connecting Rod, Crankshaft, Timing Gear and Camshaft, Cylinder Liner, Oil Pump, Starter |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| All Models | ||
| Cylinder head bolt tightening torque | 56.9 to 61.8 N·m (5.8 to 6.3 kgf·m, 43.4 to 47.0 ft·lbs) | p. 71 |
| Starter armature shaft thrust gap | 0.05 to 1.00 mm (0.0020 to 0.0394 in.) | p. 126 |
| Air cleaner element cleaning air pressure | 205 kPa or less | p. 22 |
| Oil filter replacement interval | Every 100 h | p. 20 |
| Cylinder head gasket thickness (tightened) | 0.95 to 1.05 mm (0.0374 to 0.0413 in.) | p. 66 |
| EA300-E2-NB1 | ||
| Recommended battery charging capability | 28 to 32 Ah | p. 55 |
| EA300-NB1 | ||
| Glow plug resistance | 0.9 Ω | p. 85 |
| EA300-E2-NB1, EA300-E2-NB1-APU | ||
| Injection timing (static) | 0.45 rad (25.5°) before T.D.C. | p. 70 |
| Engine Oil Capacity | 1.3 L | p. 6 |
| EL300-E2-AR, EL300-E2-AR-KCL | ||
| Injection timing (static) | 0.38 rad (22°) before T.D.C. | p. 70 |
Kubota EA300-E2-NB1, EA300-E2-NB1-APU, EL300-E2-AR, EL300-E2-AR-KCL Common Problems This Manual Covers
Engine cranks but will not start
After running out of fuel or servicing the fuel system, air trapped in the lines keeps the engine from firing until it is bled at the filters and injectors. The Fuel System section covers injection timing and fuel tightness checks.
Manual Section: Fuel System p. 45Rough running and power loss under load
Clogged filters, poor fuel, or air in the system leave the engine down on power. The Troubleshooting section lists deficient output and uneven running with their causes.
Manual Section: Troubleshooting p. 62Overheats in a hot engine room
In confined or high-temperature installations the cooling capacity can fall short, and a slack fan belt or leaking radiator makes it worse. The Cooling System section covers fan belt tension and radiator tightness tests.
Manual Section: Cooling System p. 42Low engine oil pressure
Worn pump or bearing clearances drop oil pressure below the rated figure. The Lubricating System section covers checking engine oil pressure.
Manual Section: Lubricating System p. 39Hard cold starting or slow crank
A weak battery, corroded cables, or a failed glow plug slows cranking and cold starts. The Electrical System section covers the starter and glow plug tests.
Manual Section: Electrical System p. 53Low compression or noisy valves
Worn valves, seats, or an out-of-spec valve clearance cut compression and add noise. The Engine Body section covers compression pressure, valve clearance, and top clearance.
Manual Section: Engine Body p. 31Frequently Asked Questions
Which engines does this manual cover?
The Kubota EA300-E2-NB1, EA300-E2-NB1-APU, EL300-E2-AR, and EL300-E2-AR-KCL diesel engines, all 309 cc. It is a full workshop manual with specifications, troubleshooting, and complete servicing procedures.
What is the cylinder head bolt torque?
The Tightening Torques section gives 56.9 to 61.8 N-m (43.4 to 47.0 ft-lbs) for the cylinder head bolts, alongside the general and special-use fastener torques. p. 71
How do I set the injection timing?
The Fuel System section covers injection timing. The static setting is 0.45 rad before T.D.C. for the EA300-E2-NB1 and EA300-E2-NB1-APU, and 0.38 rad for the EL300-E2-AR and EL300-E2-AR-KCL. p. 45
Does it include starter rebuild specs?
Yes. The Electrical System section covers the starter, and the servicing specifications include a commutator outside-diameter limit of 27.0 mm and a brush-length limit of 10.5 mm. p. 53
Is this Kubota EA300-E2-NB1 manual a PDF I download?
Instant PDF download. You get the full 128-page searchable Workshop Manual immediately after payment. Open it on your laptop, tablet, or phone right in the shop.
Is this Kubota EA300-E2-NB1 Workshop Manual printable?
Yes. The PDF has no DRM restrictions, print any page or section you need for your shop. Works with any standard printer.
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