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.
What's Inside This Kubota Z602-E, D902-E 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 | 2.5 L | p. 8 |
| D902-E | ||
| Lubricating Oil Capacity | 3.7 L | p. 8 |
Kubota Z602-E, D902-E Common Problems This Manual Covers
Hard cold starting
A diesel that cranks but will not fire when cold often has weak glow plugs, an injection fault or low compression. The Servicing section covers fuel system and electrical troubleshooting to isolate the cause.
Manual Section: Servicing p. 18Low compression and power loss
Blue smoke, blow-by and sluggish power point to worn rings, valves or a tired cylinder head. The Servicing section lists the 3.53 to 4.02 MPa factory compression and engine body service steps.
Manual Section: Servicing p. 18Engine overheating
Overheating usually traces to a failed thermostat, a slipping fan belt or a fouled cooling fin. The Servicing section covers the cooling system with the 69.5 to 72.5 C thermostat opening spec.
Manual Section: Servicing p. 18Low oil pressure warning
A drop in oil pressure can mean a worn pump, a stuck relief valve or diluted oil. The Servicing section covers the lubricating system and gives the 147 kPa allowable limit at rated speed.
Manual Section: Servicing p. 18Noisy valvetrain
A ticking top end after hours of use usually means the valve clearance has drifted. The Servicing section provides the 0.145 to 0.185 mm cold clearance and the adjustment procedure.
Manual Section: Servicing p. 18Cylinder head design confusion during rebuild
The Z602-E and D902-E use a half-floating head cover, which trips up first time rebuilders. The Mechanism section explains the engine body and head construction before you start the teardown.
Manual Section: Mechanism p. 14Frequently Asked Questions
Which engines does this manual cover?
It covers the Kubota Z602-E and D902-E diesel engines. Specifications, mechanism descriptions and servicing procedures are given for both units.
What equipment uses these engines?
The Z602-E and D902-E are compact Kubota industrial diesels used as OEM powerplants in generators, mowers, compact machinery and similar equipment. This manual services the engine itself, not any specific host machine.
What valve clearance and compression figures does it give?
The Servicing section lists a 0.145 to 0.185 mm cold valve clearance and a factory compression pressure of 3.53 to 4.02 MPa, along with the checking and adjusting procedures. p. 18
Does it list the oil capacity for each engine?
Yes. The Specifications section gives a lubricating oil capacity of 2.5 L for the Z602-E and 3.7 L for the D902-E, plus type, displacement and speed data. p. 8
Is this Kubota Z602-E manual a PDF I download?
Instant PDF download. The complete 108-page searchable Workshop Manual is available the moment payment clears, ready to open on a laptop, tablet, or phone in the shop.
Am I free to print this Kubota Z602-E Workshop Manual?
No restrictions at all. Print individual pages, full chapters, or the entire manual. The PDF is completely unlocked.
Reviews
There are no reviews yet.