Cat 3508 Troubleshooting
| Engine Model: Caterpillar 3508 |
| Engine Type: 4-stroke 8-cylinder V-block turbocharged liquid-cooled diesel |
| Total Displacement: 2,110 cu.in (34.5 L) |
| Rated Engine Power: 680-1,900 Hp (507-1,417 kW) at 1900 rpm |
| Fuel System Type: Mechanical or Electronic Unit Injector |
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| Engine starts up hard or doesn't start |
Fuel filter plugging - Filter maintenance required.
Air in fuel tank - Bleed fuel tank.
Damaged or dirty injection nozzles - Change fuel injection nozzles.
Fuel injection pump failure - Repair or install new pump.
Improper valve timing - Set the valve timing correctly.
Plugged fuel pipes - Clean fuel pipes.
Wrong injection timing - Check injection timing adjustment.
Worn cylinder or piston rings - Replace faulty parts.
Fuel filter element clogging - Filter maintenance required.
Fuel injection pump is not operating properly - Replace injection pump or repair it.
Air filter is dirty - Clean or replace the element.
Unadjusted nozzle opening pressure - Adjust according to specifications.
| Engine shuts off while running |
Fuel injection timing is wrong - Set it up as required.
Clogged fuel filter - Clean or change the filter.
Engine is not preheated - Normalize the temperature by warming up the engine.
Injection nozzles sticking or clogged - Repair or replace injection nozzles.
| Engine stalls while idling |
Low idle speed setting is not correct - Correct low idle settings.
Valve clearance is out of adjustment - Correct valve clearance.
Fuel injection pump is damaged - Change pump or rebuild it.
| Engine is not running at maximum power |
Clogged injection nozzle - Test injection nozzles and change if necessary.
Dirty fuel lines or hoses - Clean fuel hoses and lines.
Dirty air filter - Clean air cleaner element.
Cylinder head gasket is worn - Install a new gasket.
Injection timing is improper - Adjust injection timing as required.
Fuel injection pump failure - Repair or install new pump.
One of moving engine components is worn - Repair or replace defective parts.
Dirty radiator core or faulty radiator cap - Clean radiator or replace cap.
Insufficient coolant fluid - Refill to the correct level and inspect system for leaks.
Loose or damaged fan belt - Install new fan belt.
Lack of engine oil - Fill the crankcase with engine oil.
Defective cylinder head gasket - Install a new gasket.
Improper injection timing - Adjust according to specifications.
Low oil level - Need to add oil.
Defective oil pump - Repair or change.
Dirty oil filter element - Clean or replace engine oil filter element.
Stuck or worn relief valve - Change or clean relief valve.
Crankshaft bearing clearance is excessive - Inspect and change or repair worn components.
Excessive crankpin bearing clearance - Check and replace or repair defective parts.
| Engine oil consumption is too high |
Oil leaks: Gaskets or seals are excessively worn - Change to repair leaks.
Wrong oil viscosity - Use correct viscosity oil.
Piston rings are stuck or worn - Have piston rings replaced.
Valve guides and stems are worn - Change the valves.
Pistons or cylinder liners are scored - Check pistons and liners, install new parts as required.
| Abnormal engine noise or knocking |
Engine is not fully warmed up - Engine is not warmed up to the required temperature.
Insufficient engine oil - Checking oil level and add if necessary.
Improper fuel injection timing - Adjust the pump as required.
Pistons are worn or scored - Pistons need to be replaced.
Misaligned or defective connecting rod - Connecting rod needs to be replaced or aligned.
Battery voltage is low - Battery needs to be recharged.
Battery runs out quickly - Battery needs service or replacement.
Terminals are faulty or battery cables are disconnected - Check wiring connections and replace or clean terminals.
Battery is discharged or defective - Replace or charge as required.
Wiring harness is disconnected or improperly connected - Check wiring harness and connect as required.
Low battery capacity - Charge the battery.
Starter motor failure - Starter needs to be changed.
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