Part of the Kubota Repair Manuals.
This is the Kubota factory workshop manual for the Z602-E and D902-E diesel engines, the compact powerplants Kubota builds into generators, compact machinery and OEM equipment. Its 108 pages combine a Mechanism section that explains how the engine body, piston, oil pan and cooling system work with a large Servicing section covering the engine body, lubricating system, cooling system, fuel system and electrical system.
You get factory servicing specifications and tightening torques, including the 0.145 to 0.185 mm cold valve clearance, the 3.53 to 4.02 MPa compression pressure and separate oil capacities of 2.5 L for the Z602-E and 3.7 L for the D902-E. That lets you troubleshoot low power, hard starting or oil pressure faults and rebuild to the right numbers.
It downloads instantly as a PDF you can print or read on any device.
Complete the set for your Z602-E, D902-E
What's Inside This Manual
| System | Pages | Key Topics |
|---|---|---|
| Record of Revisions | 3 | Added the Information of Metal Cylinder Head Gasket, Added the Information About Model Name and New Engine Serial Number |
| Safety Instructions | 4-7 | Safety First, Danger, Warning, Caution, Important, Note, Before Servicing and Repairing, Safety Starting |
| Specifications | 8 | Model, Type, Number of Cylinders, Bore - Stroke, Total Displacement, Sae Net Continuous, Sae Net Intermittent, Maximum Bare Speed |
| Performance Curves | 9-10 | Z602-E Performance, Performance Curve Legend, D902-E Performance |
| Dimensions | 11-13 | Z602-E Dimensions, Unit of Measurement, D902-E Dimensions |
| Mechanism | 14-17 | Engine Body (Half-Floating Head Cover), Piston, Oil Pan, Cooling System (Cooling Fin) |
| Servicing | 18-108 | General, Engine Body Servicing, Lubricating System, Cooling System Servicing, Fuel System, Electrical System |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| All Models | ||
| Cylinder head cover screw tightening torque | 6.86 to 11.3 N-m (0.7 to 1.15 kgf-m, 5.1 to 8.3 ft-lbs) | p. 25 |
| Injection pipe retaining nut tightening torque | 19.6 to 24.5 N-m (2.0 to 2.5 kgf-m, 14.5 to 18.1 ft-lbs) | p. 25 |
| Cylinder Head Cover Torque | 6.86 to 11.3 N-m | p. 25 |
| Injection Pipe Retaining Nuts Torque | 24.5 to 34.3 N-m | p. 25 |
| Nozzle Holder Assembly Torque | 49.0 to 68.6 N-m | p. 25 |
| Cylinder Head Screw Torque | 37.3 to 42.2 N-m | p. 25 |
| Valve Clearance (Cold) | 0.145 to 0.185 mm | p. 30 |
| Compression Pressure (Factory Spec) | 3.53 to 4.02 MPa | p. 30 |
| Engine Oil Pressure (At Rated Speed, Allowable Limit) | 147 kPa | p. 34 |
| Fan Belt Tension | 7.0 to 9.0 mm / 98 N | p. 34 |
| Z602-E | ||
| Lubricating Oil Capacity, Z602-E | 2.5 L | p. 8 |
| D902-E | ||
| Lubricating Oil Capacity, D902-E | 3.7 L | p. 8 |
