Cummins QSB4.5 Troubleshooting
| Engine Model: Cummins QSB4.5 |
| Engine Type: 4-cycle inline 4-cylinder common-rail direct injection liquid-cooled diesel |
| Total Displacement: 275 cu.in (4.5 L) |
| Rated Engine Power: 99-174 Hp (74-130 kW) at 2400 rpm |
| Aspiration Type: Turbocharged |
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| Engine hard to start or will not start |
Clogged fuel filter - Clean or replace the filter.
Air trapped in fuel system - Bleed air.
Dirty or faulty injection nozzles - Check and replace nozzles if required.
Fuel injection pump damage - Rebuild or replace pump.
Valve timing is incorrect - Correct or replace timing gear.
Dirty fuel pipes - Service or change fuel pipes.
Injection timing is wrong - Adjust as recommended.
Cylinder or piston rings are worn - Change defective parts.
| Diesel starts but immediately stops |
Fuel filter element clogging - Install new filter element.
Fuel injection pump malfunction - Install a new fuel pump or repair.
Restricted intake air - Clean or replace element.
Nozzle opening pressure is improper - Set up as recommended.
| Engine shuts off while running |
Improper fuel injection timing - Adjust according to specifications.
Clogged fuel filter - Install new filter element.
Engine is cold - Normalize the temperature by warming up the engine.
Injection nozzles are stuck or clogged - Clean or change injection nozzles.
| Engine stalls when idling |
Low idle speed set incorrectly - Adjust low idle speed.
Valve clearance is out of adjustment - Adjust valve clearance.
Damaged fuel injection pump - Rebuild or replace pump.
Fuel injection nozzles are damaged - Install a new kit of correctly balanced nozzles.
Fuel hoses or lines are clogged - Fuel lines and hoses need to be cleaned.
Air filter is clogged - Clean or replace element.
Cylinder head gasket is worn - Replace the gasket as required.
Incorrect injection timing - Adjust injection timing as required.
Fuel injection pump is defective - Change or repair the pump.
One of moving engine components is worn - Repair or replace defective parts.
Dirty radiator fins or faulty radiator cap - Clean radiator or replace cap.
Insufficient coolant fluid - Add coolant and check the components of cooling system.
Fan belt is broken or worn - Fan belt must be replaced.
Engine oil insufficient - Fill the crankcase with engine oil.
Cylinder head gasket is defective - Cylinder-head gasket replacement required.
Improper injection timing - Adjust as recommended.
| Insufficient oil pressure |
Not enough oil in the engine - Check and refill the oil.
Oil pump is defective - Replace as required.
Oil filter is clogged - Service or replace engine oil filter.
Relief valve is stuck or broken - Replace or clean relief valve.
Excessive crankshaft bearing clearance - Check and replace or repair defective parts.
Crankpin bearing clearance is excessive - Check and replace or repair defective parts.
| Diesel engine consuming too much oil |
Oil leaks: Damaged gaskets or seals - Worn parts need to be replaced.
Incorrect oil viscosity - Fill up with the correct oil viscosity.
Damaged or seized piston rings - Change piston rings.
Damaged valve guides or valve stems - Valves replacement required.
Damaged pistons or cylinder liners - Check pistons and liners, install new parts as required.
Engine is cold - Warm up to required temperature.
Lack of engine oil - Checking oil level and add if necessary.
Fuel injection pump timing is not adjusted - Check the fuel injection pump timing adjustment.
Piston wear or scoring - Have pistons replaced.
Connecting rod is not aligned or worn - Align or change connecting rod.
Low battery power - Battery is drained, charge it.
Battery is not holding charge - Battery needs service or replacement.
Disconnected battery cables or bad terminals - Check cables and service or change terminals.
Battery is drained or worn - Recharge or replace battery.
Disconnected or incorrectly connected wires - Inspect battery wires and connect correctly.
Battery power is low - Recharge the battery.
Starter motor is damaged - Starter needs to be changed.
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