Cat 3066 Troubleshooting
| Engine Model: Caterpillar 3066 |
| Engine Type: 4-stroke in-line 6-cylinder turbocharged liquid-cooled diesel |
| Total Displacement: 389 cu.in (6.37 L) |
| Rated Engine Power: 138-148 Hp (103-110 kW) at 2100 rpm |
| Fuel System Type: Unit injection |
____________________________________________________________________________________
| Engine difficult to start or doesn't start |
Fuel filter element clogging - Filter maintenance required.
Air in the fuel lines - Bleed the fuel lines.
Defective or clogged injection nozzle - Check injection nozzles and replace if required.
Faulty fuel injection pump - Repair or change injection pump.
Valve timing is wrong - Correct or change timing gear.
Clogged fuel pipes - Clean fuel pipes.
Injection timing is incorrect - Adjust as recommended.
Worn piston rings and cylinder - Change defective components.
| Engine starts and then shuts off |
Fuel filter element is clogged - Service the filter.
Fuel injection pump is not working correctly - Rebuild or change fuel pump.
Air filter element clogged - Service air cleaner.
Nozzle opening pressure is incorrect - Adjust according to specifications.
| Engine stalls while running |
Fuel injection timing is not adjusted - Set it up as required.
Dirty fuel filter - Service the filter.
Engine is cold - Engine is not warmed up to the required temperature.
Injection nozzles sticking or clogged - Service or change injection nozzles.
| Engine stalls when idling |
Low idle speed set incorrectly - Correct the settings.
Valve clearance is wrong - Adjust valve clearance.
Fuel injection pump failure - Repair or replace injection pump.
Fuel injection nozzles are dirty or defective - Change fuel injection nozzles.
Fuel lines or hoses are dirty - Clean fuel system hoses and lines.
Air filter is clogged - Install new air filter element.
Cylinder head gasket is worn - Change cylinder head gasket.
Wrong injection timing - Adjust according to specifications.
Fuel injection pump is broken - Replace or repair injection pump.
Any of moving engine components is faulty - Repair or replace defective parts.
Radiator core is clogged or radiator cap is leaking - Clean radiator or install new cap.
Coolant level is low - Fill radiator to proper level and check components for faults.
Excessive wear of the fan belt - The fan belt needs to be replaced.
Engine oil insufficient - Add oil to the engine crankcase.
Defective cylinder head gasket - Install a new gasket.
Injection timing is incorrect - Adjust as recommended.
Not enough oil in the engine - Fill the crankcase with oil.
Oil pump malfunction - Check and replace if necessary.
Clogged oil filter - Clean or change engine oil filter.
Relief valve is seized or worn - 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.
| Engine oil consumption is too high |
Oil leaking: Defective seals or gaskets - Worn parts need to be replaced.
Improper oil viscosity - Fill up with the proper oil viscosity.
Piston rings are stuck or worn - Change the piston rings as required.
Worn valve guides and valve stems - Replace defective valves.
Worn pistons or cylinder liners - Check pistons and liners, install new parts as required.
Engine has not warmed up to the recommended temperature - Engine is not warmed up to the required temperature.
Engine oil level is insufficient - Add oil to the engine crankcase.
Fuel injection pump timing is wrong - Use the correct fuel injection pump timing adjustment.
Worn or broken pistons - Install new pistons.
Connecting rod is misaligned or defective - Need to replace or align the connecting rod.
| Starter motor cranks slow |
Battery voltage is low - Charge the battery.
Battery is draining quickly - Service or replace the battery.
Disconnected wiring or bad battery terminals - Check cables and clean or change terminals.
Battery is drained or worn - Replace or charge as required.
Disconnected or improperly connected wiring harness - Inspect battery wiring harness and connect as required.
Battery voltage is low - Recharge the battery.
Damaged starter motor - Change or repair starter.
____________________________________________________________________________________
| Industrial Engines Technical Specifications |
| Car Engines Technical Specifications |
| Small Engines Technical Specifications |
| Outboard Engines Technical Specifications |
