Kubota D1105 Troubleshooting
| Engine Model: Kubota D1105 |
| Engine Type: 4-cycle vertical 3-cylinder liquid-cooled diesel |
| Total Displacement: 68.6 cu.in (1.12 L) |
| Rated Engine Power: 25 Hp (18.7 kW) at 3200 rpm |
| Aspiration Type: Naturally aspirated |
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| Engine hard to start or won't start |
Clogged fuel filter - Filter maintenance required.
Air trapped in fuel system - Bleed air.
Fuel injection nozzles are damaged - Service or change injection nozzles.
Fuel injection pump is broken - Repair or install new pump.
Unadjusted valve timing - Adjust or replace timing gear.
Fuel pipes are clogged - Clean or change fuel pipes.
Injection timing is improper - Adjust as recommended.
Excessive wear of piston rings and cylinder - Replace defective components.
| Diesel starts but stalls suddenly |
Clogged fuel filter - Install new filter element.
Fuel injection pump is defective - Replace injection pump or repair it.
Clogged air filter - Install new air filter element.
Nozzle opening pressure is not adjusted - Adjust as recommended.
| Diesel shuts off while driving |
Improper setting of fuel injection pump timing - Adjust the pump as required.
Clogged fuel filter - Clean the filter element.
Engine is not preheated - Normalize the temperature by warming up the engine.
Injection nozzles are jammed or clogged - Clean or change injection nozzles.
| Engine stalls when idling |
Wrong adjustment of low idle speed - Normalize low idle speed.
Improper valve clearance - Correct valve clearance needs to be set.
Fuel injection pump is damaged - Repair or change injection pump.
Defective or clogged injection nozzle - Install a new kit of correctly balanced nozzles.
Fuel hoses or lines are clogged - Service fuel hoses and lines.
Air filter element clogged - Install new air filter element.
Cylinder head gasket is damaged - Gasket should be replaced.
Injection timing is wrong - Check injection timing adjustment.
Fuel injection pump is defective - Repair or replace injection pump.
One of moving engine components is worn - Repair or replace defective components.
Radiator fins are dirty or radiator cap is defective - Clean radiator or change cap.
Insufficient coolant fluid - Top up coolant fluid and check system for leaks.
Fan belt is loose or defective - Belt change is required.
Engine oil insufficient - Check oil level and add oil as required.
Cylinder head gasket is defective - Install a new gasket.
Incorrect injection timing - Set the injection timing correctly.
Lack of oil - Need to add oil.
Oil pump malfunction - Install a new pump.
Clogged oil filter - Replace or clean engine oil filter element.
Relief valve is seized or worn - Replace or service relief valve.
Excessive oil clearance of crankshaft bearing - Test and replace or repair worn components.
Clearance of crankpin bearing is excessive - Test and replace or repair worn components.
| Diesel engine using too much oil |
Oil leaking: Gaskets or seals are excessively worn - Install new components.
Incorrect oil viscosity - Use oil of proper viscosity.
Stuck or defective piston rings - Change the piston rings as required.
Valve stems or guides are damaged - Install new valves.
Damaged pistons or cylinder liners - Check pistons and liners, install new parts as required.
Engine is not fully warmed up - Warm up the engine.
Engine oil level is insufficient - Need to add engine oil.
Improper setting of fuel injection pump timing - Set the fuel pump timing correctly.
Pistons are worn or scored - Replace the pistons.
Connecting rod is defective or not aligned - Need to align or replace the connecting rod.
Low battery output voltage - Charge the battery.
Battery won’t hold charge - Service charging system or change battery.
Faulty battery terminals or disconnected cables - Connect wiring properly or install new terminals.
Battery is discharged or worn - Need to charge or replace the battery.
Disconnected or incorrectly connected wires - Inspect battery wires and connect correctly.
Low battery voltage - Charge the battery.
Defective starter motor - Starter should be changed.
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