Cummins 4BTA3.9-G2 Troubleshooting
| Engine Model: Cummins 4BTA3.9-G2 |
| Engine Type: 4-cycle inline 4-cylinder direct-injection liquid-cooled diesel |
| Total Displacement: 239 cu.in (3.9 L) |
| Rated Engine Power: 67-120 Hp (50-90 kW) at 2300 rpm |
| Aspiration Type: Turbocharged and aftercooled |
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| Engine starts up hard or doesn't start |
Fuel filter element is clogged - Replace filter element.
Air in the fuel system - Air bleeding.
Fuel injection nozzles are faulty or clogged - Inspect nozzles and replace if necessary.
Fuel injection pump is damaged - Repair or install new pump.
Unadjusted valve timing - Adjust or replace timing gear.
Dirty fuel pipes - Service or change fuel pipes.
Injection timing is out of adjustment - Check injection timing adjustment.
Worn piston rings and cylinder - Replace faulty parts.
| Engine starts and stops suddenly |
Fuel filter plugging - Service the filter.
Damaged fuel injection pump - Change or repair the pump.
Restricted intake air - Service or replace the air filter.
Nozzle opening pressure is improper - Adjust as required.
| Engine stops suddenly during operation |
Fuel injection timing is wrong - Check the fuel injection pump timing adjustment.
Fuel filter element clogging - Change filter element.
Low coolant temperature - Warm up the engine.
Injection nozzles are jammed or clogged - Repair or replace injection nozzles.
| Engine stops while idling |
Incorrectly set low idle speed - Test and adjust.
Valve clearance is wrong - Adjust valve clearance.
Damaged fuel injection pump - Change or repair the pump.
Fuel injection nozzles fault - Test injection nozzles and change if necessary.
Fuel lines or hoses are clogged - Service fuel lines and hoses.
Air filter plugged - Clean or change.
Defective cylinder head gasket - Install a new gasket.
Unadjusted injection timing - Adjust according to specifications.
Fuel injection pump is damaged - Change pump or rebuild it.
One of moving engine parts is faulty - Replace or repair damaged components.
Faulty radiator cap or dirty radiator fins - Clean radiator or install new cap.
Lack of engine coolant - Refill to the correct level and inspect system for leaks.
Broken or loose fan belt - Install new fan belt.
Lack of engine oil - Need to add engine oil.
Damaged cylinder-head gasket - Gasket should be replaced.
Injection timing is out of adjustment - Adjust injection timing as required.
Oil level is low - Add oil as required.
Oil pump is worn or damaged - Repair or change.
Oil filter is dirty - Clean or replace engine oil filter element.
Relief valve is defective or dirty - Change or service relief valve.
Crankshaft bearing clearance is excessive - Check and change or repair defective parts.
Excessive oil clearance of crankpin bearing - Check and change or repair defective parts.
| Diesel engine using too much oil |
Oil leaking: Worn seals or gaskets - Replace defective parts.
Oil viscosity is wrong - Fill up with the correct oil viscosity.
Worn or stuck piston rings - Change piston rings.
Worn valve guides and valve stems - Install new valves.
Pistons or cylinder liners are scored - Inspect pistons and liners, replace as required.
| Abnormal engine knocking or noise |
Engine has not warmed up to the recommended temperature - Warm up engine as required.
Lack of engine oil - Check and refill engine oil.
Fuel injection pump timing is wrong - Set up as recommended.
Pistons are broken or worn - Pistons replacement required.
Connecting rod is misaligned or defective - Replace or align connecting rod.
Low battery voltage - Low battery charging, charge as required.
Battery will not hold charge - Service charging system or install new battery.
Disconnected cables or faulty battery terminals - Connect wiring correctly or install new terminals.
Battery is drained or worn - Change or recharge battery.
Wiring is improperly connected or disconnected - Check wiring and connect properly.
Battery voltage is low - Battery is drained, recharge it.
Damaged starter motor - Starter should be changed.
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