Cat 3126B Troubleshooting
| Engine Model: Caterpillar 3126B |
| Engine Type: 4-cycle inline 6-cylinder HEUI direct injection liquid-cooled diesel |
| Total Displacement: 439 cu.in (7.2 L) |
| Rated Engine Power: 170-330 Hp (127-246 kW) at 2400 rpm |
| Aspiration Type: Turbocharged |
____________________________________________________________________________________
| Engine starts up hard or won't start |
Fuel filter plugging - Clean the filter element.
Air in fuel system - Bleed fuel system.
Damaged or dirty injection nozzles - Install a new kit of correctly balanced nozzles.
Fuel injection pump is not working correctly - Repair or change injection pump.
Improper valve timing - Correct or change timing gear.
Plugged fuel pipes - Service or replace fuel pipes.
Unadjusted injection timing - Check injection timing adjustment.
Excessive wear of piston rings and cylinder - Replace defective components.
Clogged fuel filter - Clean the filter element.
Faulty fuel injection pump - Rebuild or change fuel pump.
Clogged air filter - Air filter maintenance required.
Nozzle opening pressure is not adjusted - Adjust according to specifications.
| Engine shuts off suddenly during operation |
Fuel injection timing is wrong - Adjust the pump as required.
Fuel filter plugged - Service or replace the filter.
Engine not warmed up - Warm up to required temperature.
Injection nozzles are stuck or clogged - Repair or replace injection nozzles.
| Engine stops while idling |
Incorrectly set low idle speed - Normalize low idle speed.
Valve clearance is not correct - Have it adjusted.
Fuel injection pump malfunction - Replace or repair injection pump.
| Diesel engine is losing power |
Fuel injection nozzles are faulty or clogged - Test injection nozzles and change if necessary.
Fuel hoses or lines are clogged - Clean fuel lines and hoses.
Air filter is dirty - Air filter maintenance required.
Worn cylinder head gasket - Change cylinder head gasket.
Injection timing is improper - Set up as recommended.
Faulty fuel injection pump - Install a new fuel pump or repair.
One of moving engine components has failed - Repair or replace defective parts.
Dirty radiator fins or defective radiator cap - Clean radiator or replace cap.
Lack of coolant in cooling system - Add coolant and check the components of cooling system.
Excessive wear of the fan belt - Fan belt must be replaced.
Insufficient engine oil - Need to add engine oil.
Cylinder head gasket is damaged - Replace cylinder head gasket.
Incorrect injection timing - Adjust injection timing as required.
| Oil pressure is insufficient |
Lack of oil - Check oil level and add oil as required.
Oil pump is damaged - Remove and inspect oil pump.
Oil filter clogging - Clean or change engine oil filter.
Worn or dirty relief valve - Change or service relief valve.
Clearance of crankshaft bearing is excessive - Test and repair or replace worn parts.
Clearance of crankpin bearing is excessive - Test and repair or replace worn parts.
Oil leakage: Damaged seals or gaskets - To repair leaks, replace worn parts.
Improper oil viscosity - Use oil of proper viscosity.
Stuck or defective piston rings - Have piston rings replaced.
Worn valve stems and valve guides - Change the valves.
Pistons or cylinder liners are worn - Check liners and pistons, install new components as required.
Engine is cold - Warm up engine as required.
Engine oil level is insufficient - Fill the crankcase with engine oil.
Fuel injection pump timing is not adjusted - Adjust as recommended.
Pistons are scored or worn - Have pistons replaced.
Misaligned or defective connecting rod - Align or replace connecting rod.
Low battery output voltage - Battery needs to be recharged.
Battery discharges quickly - Battery needs service or replacement.
Disconnected cables or faulty battery terminals - Connect wires properly or change terminals.
Battery is low or faulty - Replace or charge as required.
Battery cables are disconnected or improperly connected - Inspect cables and connect properly.
Battery power is low - Low battery charging, charge as required.
Defective starter motor - Replace or repair starter.
____________________________________________________________________________________
| Industrial Engines Technical Specifications |
| Small Engines Technical Specifications |
| Car Engines Technical Specifications |
| Outboard Engines Technical Specifications |
