Cat C7.1 Troubleshooting
| Engine Model: Caterpillar C7.1 |
| Engine Type: 4-cycle inline 4-cylinder common-rail direct injection liquid-cooled diesel |
| Total Displacement: 428 cu.in (7.1 L) |
| Rated Engine Power: 140-320 Hp (104-239 kW) at 2200 rpm |
| Aspiration Type: Turbocharged |
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| Engine difficult to start or will not start |
Fuel filter element is clogged - Replace the filter element.
Air in the fuel pipes - Bleed the fuel pipes.
Defective or clogged injection nozzle - Service or change injection nozzles.
Fuel injection pump is damaged - Install a new pump or rebuild.
Wrong valve timing - Correct or replace timing gear.
Fuel pipes clogging - Service fuel pipes.
Improper injection timing - Check injection timing adjustment.
Worn cylinder or piston rings - Replace faulty parts.
| Engine starts but then stops |
Fuel filter element clogging - Clean or replace the filter.
Fuel injection pump is broken - Repair or change injection pump.
Plugged air cleaner - Clean or change the filter.
Incorrect nozzle opening pressure - Adjust as required.
| Diesel shuts off while driving |
Fuel injection timing is not adjusted - Check the fuel injection pump timing adjustment.
Fuel filter element is clogged - Install new filter element.
Engine has not warmed up to the recommended temperature - Warm up the engine.
Injection nozzles are burnt or jammed - Clean or change injection nozzles.
| Engine stops while idling |
Low idle speed set incorrectly - Correct low idle adjustment.
Improper valve clearance - Need to adjust valve clearance.
Fuel injection pump is defective - Change or repair the pump.
Fuel injection nozzles are dirty or defective - Check and replace nozzles if required.
Restricted fuel hoses or lines - Clean fuel system lines and hoses.
Dirty air filter - Air filter maintenance required.
Cylinder head gasket is worn - Gasket should be replaced.
Unadjusted injection timing - Use correct injection timing adjustment.
Faulty fuel injection pump - Change pump or rebuild it.
Any of moving engine parts is worn - Change or repair damaged parts.
Radiator fins are dirty or radiator cap is defective - Clean radiator or replace cap.
Insufficient coolant - Refill to the correct level and inspect system for leaks.
Loose or defective fan belt - Change as required.
Engine oil level low - Fill up the engine oil.
Cylinder head gasket is damaged - Change cylinder head gasket.
Unadjusted injection timing - Set up as recommended.
Oil level is insufficient - Fill up the engine oil.
Defective oil pump - Check and replace if necessary.
Oil filter element clogged - Service or change engine oil filter element.
Stuck or defective relief valve - Replace or clean relief valve.
Clearance of crankshaft bearing is excessive - Inspect and change or repair worn components.
Crankpin bearing clearance is excessive - Check and change or repair defective parts.
Oil leaks: Gaskets or seals may be damaged - Install new components.
Crankcase oil too light - Fill up with the correct oil viscosity.
Seized or wear piston rings - Replace piston rings.
Worn valve guides and valve stems - Need to replace the valves.
Pistons or cylinder liners are damaged - Inspect pistons and liners, change as required.
Engine not warmed up - Warm up engine as required.
Not enough engine oil - Fill up the engine oil.
Timing of fuel injection pump is incorrect - Use the correct fuel injection pump timing adjustment.
Pistons are worn or scored - Pistons replacement required.
Connecting rod is misaligned or worn - Alignment procedure or replacement is required.
Low battery output voltage - Recharge the battery.
Battery will not hold charge - Service charging system or replace battery.
Bad terminals or disconnected battery cables - Check cable connections and replace or service terminals.
Battery is drained or defective - Recharge or replace battery.
Battery cables are disconnected or incorrectly connected - Check cables and connect as needed.
Low battery output - Recharge the battery.
Defective starter motor - Repair or replace starter.
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