Kubota Z602 Troubleshooting
| Engine Model: Kubota Z602 |
| Engine Type: 4-cycle vertical 2-cylinder liquid-cooled diesel |
| Total Displacement: 36.6 cu.in (0.60 L) |
| Rated Engine Power: 15.5 Hp (11.6 kW) at 3800 rpm |
| Aspiration Type: Naturally aspirated |
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| Engine starts up hard or won't start |
Fuel filter element is dirty - Replace filter element.
Air trapped in fuel system - Bleed air.
Fuel injection nozzles are faulty or clogged - Inspect nozzles and replace if necessary.
Fuel injection pump is defective - Repair or install a new fuel pump.
Unadjusted valve timing - Correct or replace timing gear.
Plugged fuel pipes - Service fuel pipes.
Injection timing is improper - Check injection timing adjustment.
Worn cylinder or piston rings - Replace defective components.
| Diesel starts and stalls immediately |
Fuel filter plugged - Clean the filter or install new filter element.
Fuel injection pump failure - Replace or repair injection pump.
Plugged air filter - Replace air filter element.
Nozzle opening pressure is improper - Set it correctly.
| Engine stalls after running |
Fuel injection timing is wrong - Set up as recommended.
Dirty fuel filter - Change filter element.
Low coolant temperature - Warm up to required temperature.
Injection nozzles are burnt or jammed - Change or repair injection nozzles.
Incorrect low idle speed adjustment - Normalize low idle speed.
Improper valve clearance - Adjust valve clearance according to specifications.
Faulty fuel injection pump - Install a new fuel pump or repair.
Clogged injection nozzle - Check injection nozzles and replace if required.
Fuel hoses or lines are dirty - Clean fuel hoses and lines.
Restricted intake air - Replace air filter element.
Damaged cylinder-head gasket - Install new cylinder head gasket.
Wrong injection timing - Set up as recommended.
Fuel injection pump is damaged - Repair or change injection pump.
One of moving engine components has failed - Repair or replace defective components.
Dirty radiator fins or faulty radiator cap - Change cap or clean radiator.
Low engine coolant - Add coolant and check the components of cooling system.
Fan belt is worn or faulty - Replace the fan belt.
Lack of engine oil - Fill up the oil to required level.
Leaking cylinder head gasket - Change cylinder head gasket.
Wrong injection timing - Set the injection timing correctly.
| Insufficient oil pressure |
Low oil level - Need to add oil.
Oil pump is defective - Replace as required.
Oil filter element clogging - Clean or replace engine oil filter element.
Relief valve is stuck or broken - Replace or clean relief valve.
Crankshaft bearing clearance is excessive - Test and replace or repair worn components.
Clearance of crankpin bearing is excessive - Inspect and replace or repair faulty parts.
| Diesel engine consuming too much oil |
External oil leaks: Worn seals or gaskets - Replace defective parts.
Crankcase oil too light - Use proper viscosity oil.
Piston rings are stuck or worn - Have piston rings replaced.
Valve stems and guides are worn - Install new valves.
Damaged cylinder liners or pistons - Check pistons and liners, change as required.
Engine is cold - Warm up engine as required.
Engine oil insufficient - Fill up the oil to required level.
Fuel injection pump timing is not adjusted - Check the fuel injection pump timing adjustment.
Pistons are broken or worn - Install new pistons.
Connecting rod is defective or misaligned - Need to change or align the connecting rod.
| Starter motor cranks slow |
Low battery output voltage - Charge the battery.
Battery drains quickly - Service charging system or change battery.
Wires are disconnected or battery terminals are corroded - Check cables and service or change terminals.
Battery is drained or defective - Recharge or replace battery.
Wire harness is disconnected or incorrectly connected - Check wire harness and connect as required.
Battery power is low - Recharge the battery.
Starter motor is damaged - Starter should be replaced.
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