Part of the Kubota Repair Manuals.
This Kubota Workshop Manual covers the OC60, OC80, and OC95 air-cooled diesel engines across 76 pages of factory service data. It is written for technicians and owners who rebuild and service these OC-series engines used in equipment and generating sets.The manual provides full engine, brake horsepower, fuel, cooling, lubricating, and electrical specifications, performance curves for each model, and appearance and dimension drawings. The Mechanism section explains the engine body, lubricating, cooling, and fuel system design, while the Disassembling and Servicing section carries troubleshooting, servicing specifications, tightening torques, and step-by-step overhaul.Use it to trace hard starting and low compression, set valve clearance, service the injection pump and nozzle, correct low oil pressure, and reassemble the cylinder head, piston, and connecting rod to the listed torque figures, with fuel and oil capacities given for each model.
What's Inside This Kubota OC60, OC80, OC95 Manual
| System | Pages | Key Topics |
|---|---|---|
| Specifications | 4 | Engine Specifications, Brake Horsepower Specifications, Fuel System Specifications, Cooling and Lubricating System Specifications, Electrical and General Specifications |
| Performance Curves | 5-6 | OC60 Performance Curves, OC80 Performance Curves, OC95 Performance Curves, Performance Curve Legend |
| Appearance and Dimensions | 7-9 | OC60, OC80, OC95, D Type, G Type, PTO Shaft Dimensions |
| M. Mechanism | 10-23 | Feature, Engine Body (Cylinder Head, Crank Case and Cylinder Liner, Uniaxial Balancer System), Lubricating System (General, Oil Strainer, Oil Pump, Oil Pressure Switch) |
| General | 25-44 | Engine Identification, General Precautions, Maintenance Check List, Check and Maintenance, Special Tools |
| Engine Body | 45-64 | Draining Oil and Fuel Oil, External Components, Cylinder Head and Valves, Injection Pump, Side Cover, Piston and Connecting Rod, Speed Control Lever and Governor Lever |
| Lubricating System | 65-66 | Oil Pump, Relief Valve |
| Fuel System | 67-69 | Injection Pump, Injection Nozzle |
| Electrical System | 70-76 | Alternator, Regulator, Glow Plug, Starter |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| OC60 | ||
| Fuel tank Capacity | 3.6ℓ(0.95 U.S.gal, 0.79 Imp.gal) | p. 4 |
| Valve Spring Free Length (Allowable Limit) | 31.0 mm | p. 29 |
| Engine Oil Capacity | 1.3ℓ | p. 4 |
| OC80,OC95 | ||
| Fuel tank Capacity | 5.5ℓ(1.45 U.S.gal, 1.21lmp.gal) | p. 4 |
| All Models | ||
| Compression Pressure (Allowable Limit) | 25.2 kgf/cm² | p. 28 |
| Valve Clearance (Cold) (Factory Spec) | 0.14 to 0.18 mm | p. 28 |
| Valve Seat Width (Factory Spec) | 2.12 mm | p. 28 |
| Tappet Clearance (Allowable Limit) | 0.1 mm | p. 29 |
| Crankshaft Alignment (Allowable Limit) | 0.08 mm | p. 32 |
| OC80, 95 | ||
| Valve Spring Free Length (Allowable Limit) | 36.0 mm | p. 29 |
| Engine Oil Capacity | 1.7ℓ | p. 4 |
| Fuel Tank Capacity | 5.5ℓ | p. 4 |
Kubota OC60, OC80, OC95 Common Problems This Manual Covers
Hard starting or low compression
An OC engine that is slow to start or lacks power often has low compression from worn valves, rings, or liner. The troubleshooting charts point to the likely cause before teardown, with the compression allowable limit in the servicing specifications.
Manual Section: Trouble-Shooting p. 26Low oil pressure
Falling oil pressure on these small diesels usually traces to the oil pump, relief valve, or worn clearances. The lubricating system servicing covers checking and rebuilding the oil pump and relief valve.
Manual Section: Lubricating System p. 65Black smoke or fuel knock
Excess smoke and rough running commonly come from a worn injection nozzle or an out-of-spec injection pump. The fuel system section covers checking and adjusting the injection pump and nozzle to the injection pressure specification.
Manual Section: Fuel System p. 67Noisy valvetrain or tappet clatter
A ticking top end and lost performance point to valve clearance drifting out of the cold specification. The cylinder head and valves section covers checking clearance, seat width, and reassembly.
Manual Section: Cylinder Head And Valves p. 47Engine overheating
Air-cooled OC engines overheat when cooling airflow or the oil cooler is restricted or neglected. The cooling system section in the Mechanism chapter explains the cooling design and the oil cooler.
Manual Section: Cooling System p. 16Speed hunting or unstable governor
Surging or hunting engine speed traces to the governor mechanism and speed control linkage. The servicing section covers the speed control lever and governor lever adjustment and assembly.
Manual Section: Speed Control Lever And Governor Lever p. 55Frequently Asked Questions
Which engines does this manual cover?
It is the workshop manual for the Kubota OC60, OC80, and OC95 air-cooled diesel engines, with specifications, performance curves, mechanism, and full disassembling and servicing across 76 pages.
Are tightening torque values included?
Yes. The tightening torques cover cylinder head screws, connecting rod screws, flywheel nut, and general screws and bolts, with values differing between the OC60 and the OC80 and OC95. p. 35
What specifications does it list?
The specifications give engine, brake horsepower, fuel, cooling, lubricating, and electrical data, including engine oil capacity of 1.3 L on the OC60 and 1.7 L on the OC80 and OC95. p. 4
How do I get the manual after buying?
The PDF is delivered as an instant download after purchase, so you can keep it on your own device and reference it during any engine rebuild.
How is this Kubota OC60 Workshop Manual delivered?
Yes, it's an immediate download of the full 76-page searchable Workshop Manual. Open it on any device: the laptop at your desk or the phone out in the field.
Can I print this Kubota OC60 manual?
None at all. The PDF is DRM-free, so print whatever sections you want to take out to the shop. Standard letter or A4 paper works fine.
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