Cat 3508B Troubleshooting
| Engine Model: Caterpillar 3508B |
| Engine Type: 4-cycle 8-cylinder direct injection liquid-cooled diesel |
| Total Displacement: 2105 cu.in (34.5 L) |
| Rated Engine Power: 912-2011 Hp (680-1500 kW) at 1500 rpm |
| Aspiration Type: Turbocharged and aftercooled |
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| Engine starts hard or won't start |
Fuel filter plugging - Replace the filter element.
Air in fuel system - Bleed fuel system.
Damaged or dirty injection nozzles - Install a new kit of correctly balanced nozzles.
Faulty fuel injection pump - Change or repair the pump.
Unadjusted valve timing - Adjust or change timing gear.
Fuel pipes are clogged - Clean or replace fuel pipes.
Incorrect injection timing - Adjust as recommended.
Worn piston rings and cylinder - Change faulty parts.
Fuel filter plugged - Change filter element.
Fuel injection pump is not working correctly - Rebuild or replace pump.
Plugged air cleaner - Service air cleaner.
Nozzle opening pressure is not adjusted - Adjust as required.
| Engine stops suddenly during operation |
Timing of fuel injection pump is incorrect - Use the correct fuel injection pump timing adjustment.
Fuel filter element clogging - Replace filter element.
Engine is not fully warmed up - Warm up to required temperature.
Defective or stuck injection nozzles - Check injection nozzles and replace if required.
Too low idle RPM - Adjustment required.
The valve clearance is not adjusted - Adjust valve clearance.
Fuel injection pump damage - Change pump or rebuild it.
| Diesel engine loses power |
Dirty or damaged injection nozzles - Install a new kit of correctly balanced nozzles.
Fuel hoses or lines are clogged - Clean fuel hoses and lines.
Restricted intake air - Replace air filter element.
Damaged cylinder-head gasket - Replace cylinder head gasket.
Wrong injection timing - Set the injection timing correctly.
Faulty fuel injection pump - Repair or replace injection pump.
One of moving engine components is worn - Repair or replace defective components.
Radiator core is dirty or radiator cap is damaged - Change cap or clean radiator.
Engine coolant is insufficient - The cooling system needs to be refilled and checked for faults.
Excessive wear of the fan belt - Fan belt must be replaced.
Not enough engine oil - Need to add engine oil.
Cylinder head gasket is worn - Replace cylinder head gasket.
Improper injection timing - Set the injection timing correctly.
Not enough oil in the engine - Fill the crankcase with oil.
Oil pump is damaged - Repair or replace.
Oil filter element clogged - Change or service engine oil filter.
Relief valve is seized or worn - Replace or service relief valve.
Crankshaft bearing clearance is excessive - Inspect and replace or repair faulty components.
Excessive oil clearance of crankpin bearing - Inspect and change or repair worn components.
| Excessive engine oil consumption |
External oil leaks: Worn gaskets or seals - Change worn parts according to specifications.
Oil viscosity is incorrect - Use oil of correct viscosity.
Stuck or defective piston rings - Change piston rings.
Valve guides and stems are worn - Valves must be replaced.
Cylinder liners or pistons are damaged - Check liners and pistons, change as required.
| Abnormal engine knocking or noise |
Engine is not warmed up to the required temperature - Engine is not warmed up to the required temperature.
Engine oil insufficient - Checking oil level and add if necessary.
Incorrect adjustment of fuel injection pump timing - Use the correct fuel injection pump timing adjustment.
Piston wear or scoring - Replace the pistons.
Connecting rod is worn or not aligned - Need to replace or align the connecting rod.
Battery voltage is low - Charge the battery.
Battery won’t hold charge - Service or replace the battery.
Bad battery terminals or disconnected wiring - Check cable connections and replace or service terminals.
Battery is discharged or worn - Recharge or change battery.
Disconnected or incorrectly connected wires - Inspect battery wires and connect correctly.
Low battery output - Recharge the battery.
Starter motor is defective - Repair or change starter.
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