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 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, OC60 | 3.6ℓ(0.95 U.S.gal, 0.79 Imp.gal) | p. 4 |
| Valve Spring Free Length (Allowable Limit), OC60 | 31.0 mm | p. 29 |
| Engine Oil Capacity, OC60 | 1.3ℓ | p. 28 |
| OC80,OC95 | ||
| Fuel tank Capacity (OC80,OC95) | 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) (OC80, 95) | 36.0 mm | p. 29 |
| Engine Oil Capacity (OC80, 95) | 1.7ℓ | p. 4 |
| Fuel Tank Capacity (OC80, 95) | 5.5ℓ | p. 4 |
