Part of the Kubota Repair Manuals.
This Kubota workshop manual covers the BG-series diesel engines used in standby power generators, spanning 16 model codes from the D905-BG and D1005-BG up to the V3300-BG and V4702-BG. Its 81 pages gather the specifications, dimensions, features and servicing data for the whole BG family in one PDF.You get full specifications and dimensional drawings for each engine, the governor and fuel system description, SAE flywheel and housing details, and the servicing specifications for the engine body, lubricating, cooling, fuel and electrical systems. Maintenance intervals and gear case disassembly close out the book.Because these engines are grouped by series rather than by single code, this manual is the reference for confirming clearances, torque and adjustment values across BG variants. Whether you are chasing hard starting, overheating or low compression, download the PDF and use it on any device.
What's Inside This Kubota Generator Engine Range Manual
| System | Pages | Key Topics |
|---|---|---|
| Safety Instructions | - | Safety First, Danger, Warning, Caution, Important, Note, Safety Servicing and Repairing |
| Specifications | - | D905-Bg-Sae, D1005-Bg-Sae, V1205-Bg-Sae, V1305-Bg-Sae, D1105-Bg-Sae, V1505-Bg-Sae, D1403-Bg-Sae, D1703-Bg-Sae |
| Dimensions | - | D905-Bg, D1005-Bg, D1105-Bg, V1205-Bg, V1305-Bg, V1505-Bg, D1403-Bg, D1703-Bg |
| Feature | - | Main Features of "Bg" Type Engines (Quite Power, High-Capacity Governor and Largesize Flywheel, Economical Fuel Consumption, Low Maintenance Cost, Quick and Easy Starting, Sae Standard Housing and Flywheel, Kubota Diesel Engine for Standby Power Generator, Usable Both at 50 Hz and 60 Hz, Clean Exhaust Gas, Large-Capacity Alternator, Easy to Operate) |
| Fuel System | - | Governor, General, Governor Regulation |
| General | - | Applications (General, Direct Connection to Housing, Operating Mechanism, Supporting Method, Covering), Sae Flywheel & Flywheel Housing for "Bg" Type, Servicing Specifications |
| Servicing Specifications | - | Series (Engine Body, Lubricating System, Cooling System, Fuel System, Electrical System) |
| Maintenance Interval (Engine Oil and Oil Filter Cartridge) | - | Changing Engine Oil, Changing Oil Filter Cartridge, Lubricating Oil |
| Engine Body | - | Disassembling and Assembling (Gear Case, Speed Control Plate, Fork Lever, Mm Stroke Series, Governor Spring and Speed Control Plate) |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| D905-BG, D1005-BG, D1105-BG, V1205-BG, V1305-BG, V1505-BG | ||
| Oil filter cartridge replacement interval (Initial) | 50 hrs | p. 77 |
| Oil filter cartridge replacement interval (Regular) | Every 300 hrs | p. 77 |
| Glow plug resistance | 1.0 to 1.2 Ω | p. 57 |
| Fan belt tension | 7 to 9 mm/10 kgf (0.28 to 0.35 in./10 kgf, 22.1 lbs.) | p. 56 |
| Radiator cap air leakage | 10 seconds or more (0.9→0.6 kgf/cm², 88→59 kPa, 13→9 psi) | p. 56 |
| Thermostat's valve opening temperature | 69.5 to 72.5°C (157.1 to 162.5°F) | p. 56 |
| Temperature at which thermostat completely opens | 85°C (185°F) | p. 56 |
| D1403-BG, D1703-BG, V1903-BG, V2203-BG, V2003-T-BG, F2803-BG | ||
| Glow plug resistance | 0.8 Ω | p. 63 |
| Fan belt tension | 10 to 12 mm/10 kgf (0.394 to 0.472 in./22.1 lbs.) | p. 62 |
| Radiator cap air leakage | 10 seconds or more (0.9→0.6 kgf/cm², 88→59 kPan2, 13→9 psi) | p. 62 |
| D905-BG, D1005-BG, V1205-BG, V1305-BG, D1105-BG, V1505-BG, D1403-BG, D1703-BG, V1903-BG, V2203-BG, F2803-BG, V2003-T-BG, V3300-BG, V3300-T-BG, D3502-BG, V4702-BG | ||
| Governor Regulation | Less than 5% | p. 6 |
| Cylinder Head Surface Flatness (Allowable Limit) | 0.05 mm | p. 52 |
Kubota Generator Engine Range Common Problems This Manual Covers
Hard starting or no-start
Air in the fuel, a clogged fuel filter or a weak glow system causes long cranking and no-start. The fuel system and governor coverage helps trace fuel delivery faults.
Manual Section: Fuel System p. 44Overheating and coolant loss
A failed fan belt, low coolant or a stuck thermostat leads to overheating, a leading cause of Kubota engine failure. The servicing specifications list fan belt tension and thermostat opening temperatures.
Manual Section: Servicing Specifications p. 52Low oil pressure or wrong oil level
Too little oil can seize rotating parts and too much causes blow-by and lost power. This section gives the engine oil and filter change intervals.
Manual Section: Maintenance Interval (Engine Oil and Oil Filter Cartridge) p. 77Power loss and heavy blow-by
Worn rings, valve leakage or an overfilled crankcase reduce output and increase blow-by. The engine body disassembly coverage guides top-end inspection.
Manual Section: Engine Body p. 78Rough idle or unstable speed under load
Fuel contamination or a governor fault makes idle rough and generator speed unstable under load. The governor section explains regulation and adjustment.
Manual Section: Fuel System p. 44Low compression and blue smoke
Cylinder and valve seat wear lowers compression and raises oil consumption. The servicing specifications give cylinder head flatness and clearance limits.
Manual Section: Servicing Specifications p. 52Frequently Asked Questions
Which engines does this manual cover?
It covers the Kubota BG-series diesel engines used in standby generators, 16 model codes from the D905-BG and D1005-BG up to the V3300-BG and V4702-BG, in one 81 page manual.
What is the compression ratio of these engines?
Most BG engines use a 23:1 compression ratio, with 22.6:1 on the V3300-BG and 17.5:1 on the D3502-BG and V4702-BG. The specifications section lists each model. p. 6
Does it include dimensional drawings?
Yes. The dimensions section gives scaled drawings and SAE flywheel and housing details for the engines, useful for fitment into a generator set. p. 14
Is this Kubota D1005-BG & variants Workshop Manual a digital download?
Yes. Download the full 81-page searchable Workshop Manual right away and open it on any device, from a laptop at your desk to a phone in the field.
Can I print this manual?
Yes, the PDF ships DRM-free, so you can print whatever sections you need for the shop on standard letter or A4 paper.
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