Cummins 6T-830 Troubleshooting
| Engine Model: Cummins 6T-830 |
| Engine Type: 4-stroke in-line 6-cylinder turbocharged liquid-cooled diesel |
| Total Displacement: 505 cu.in (8.3 L) |
| Rated Engine Power: 145-280 Hp (108-209 kW) at 2400 rpm |
| Fuel System Type: Direct injection |
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| Engine starts hard or doesn't start |
Fuel filter element is clogged - Service the filter.
Air in the fuel lines - Bleed the fuel lines.
Dirty or damaged injection nozzles - Change fuel injection nozzles.
Fuel injection pump is not working correctly - Replacement or repair required.
Valve timing is wrong - Use correct valve timing adjustment.
Restricted fuel pipes - Service fuel pipes.
Unadjusted injection timing - Adjust injection timing as required.
Worn cylinder or piston rings - Replace faulty components.
| Engine stalls after starting |
Fuel filter plugging - Filter maintenance required.
Fuel injection pump malfunctioning - Install a new pump or rebuild.
Air filter is dirty - Replace air filter element.
Improper nozzle opening pressure - Set it correctly.
| Engine stalls during operation |
Wrong setting of fuel injection pump timing - Adjust the pump as required.
Fuel filter element is clogged - Service the filter.
Coolant temperature is low - Warm up engine as required.
Injection nozzles are burnt or jammed - Service or change injection nozzles.
| Engine stalls when idling |
Incorrect low idle setting - Correct low idle settings.
Incorrect valve clearance - Check and adjust as required.
Fuel injection pump malfunctioning - Rebuild or replace pump.
| Engine is not running at maximum power |
Fuel injection nozzles fault - If necessary, replace with a new nozzle.
Fuel hoses or lines are dirty - Service fuel lines and hoses.
Plugged air filter - Clean or change the filter.
Blown cylinder head gasket - Replace the gasket as required.
Injection timing is incorrect - Adjust injection timing as required.
Fuel injection pump is faulty - Replacement or repair required.
One of moving engine components is worn - Replace or repair damaged components.
Radiator fins are clogged or radiator cap is faulty - Clean radiator or replace cap.
Insufficient coolant fluid - Add coolant fluid and inspect the cooling system for leaks.
Excessive wear of the fan belt - Replace the fan belt.
Engine oil level low - Fill up the oil to required level.
Damaged cylinder-head gasket - Gasket should be replaced.
Injection timing is wrong - Check injection timing adjustment.
Oil level is low - Fill up the engine oil.
Oil pump malfunction - Remove and inspect oil pump.
Dirty oil filter element - Clean or replace engine oil filter element.
Stuck or worn relief valve - Replace or service relief valve.
Excessive oil clearance of crankshaft bearing - Check and replace or repair defective parts.
Excessive crankpin bearing clearance - Test and repair or replace worn parts.
| Excessive engine oil consumption |
Oil leakage: Damaged gaskets or seals - Defective components must be replaced.
Improper oil viscosity - Fill up with the correct oil viscosity.
Damaged or seized piston rings - Change the piston rings as required.
Valve guides and stems are worn - Replace the valves.
Worn pistons or cylinder liners - Inspect liners and pistons, change as necessary.
Engine has not warmed up to the recommended temperature - Engine is not warmed up to the required temperature.
Not enough engine oil - Check oil level and add oil as required.
Wrong setting of fuel injection pump timing - Set it up as required.
Scored or worn pistons - Have pistons replaced.
Connecting rod is not aligned or worn - Connecting rod must be aligned or replaced.
Low battery output - Low battery charging, charge as required.
Battery drains quickly - Service or change the battery.
Bad terminals or disconnected battery cables - Check cables and service or change terminals.
Battery is discharged or defective - Recharge or replace battery.
Disconnected or improperly connected wiring harness - Inspect battery wiring harness and connect as required.
Battery capacity is low - Low battery charging, charge as required.
Starter motor failure - Starter needs to be changed.
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