Cat 3126 Troubleshooting
| Engine Model: Caterpillar 3126 |
| Engine Type: 4-cycle inline 6-cylinder turbocharged and aftercooled diesel |
| Total Displacement: 439 cu.in (7.2 L) |
| Rated Engine Power: 275-330 Hp (205-246 kW) at 2200 rpm |
| Fuel System Type: Hydraulic electronic unit injector (HEUI) |
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| Engine difficult to start or doesn't start |
Fuel filter element is dirty - Filter maintenance required.
Air in fuel tank - Bleed fuel tank.
Faulty or dirty injection nozzles - Clean or change injection nozzles.
Defective fuel injection pump - Install a new pump or rebuild.
Valve timing is incorrect - Use correct valve timing adjustment.
Restricted fuel pipes - Clean or replace fuel pipes.
Injection timing is out of adjustment - Set up as recommended.
Piston rings and cylinder are worn - Change defective parts.
Dirty fuel filter - Clean or change the filter.
Damaged fuel injection pump - Replacement or repair required.
Plugged air cleaner - Service air cleaner.
Nozzle opening pressure is not adjusted - Adjust according to specifications.
| Engine stalls after running |
Wrong setting of fuel injection pump timing - Set it up as required.
Clogged fuel filter - Clean the filter element.
Low coolant temperature - Warm up engine as required.
Injection nozzles are jammed or clogged - Service or change injection nozzles.
| Engine stalls while idling |
Low idle speed adjustment is incorrect - Need to adjust idle speed.
Improper valve clearance - Adjust to proper valve clearance.
Fuel injection pump malfunctioning - Change or repair the pump.
Fuel injection nozzles fault - Inspect nozzles and replace if necessary.
Restricted fuel hoses or lines - Clean fuel hoses and lines.
Dirty air cleaner - Replace air filter element.
Cylinder-head gasket is leaking - Change cylinder head gasket.
Injection timing is incorrect - Set up as recommended.
Fuel injection pump malfunctioning - Install a new pump or rebuild.
One of moving engine components is worn - Change or repair damaged parts.
Clogged radiator core or damaged radiator cap - Clean radiator or install new cap.
Coolant level is low - Add coolant fluid and inspect the cooling system for leaks.
Loose or damaged fan belt - If necessary, replace the belt.
Engine oil level low - Need to add engine oil.
Cylinder head gasket is worn - Cylinder-head gasket replacement required.
Injection timing is incorrect - Use correct injection timing adjustment.
Engine oil insufficient - Fill the crankcase with oil.
Oil pump is worn or damaged - Check and replace if necessary.
Oil filter element is dirty - Change or service engine oil filter.
Relief valve is stuck or broken - Change or clean relief valve.
Crankshaft bearing clearance is excessive - Check and replace or repair defective parts.
Excessive crankpin bearing clearance - Check and change or repair defective parts.
| Excessive oil consumption |
External oil leaks: Worn seals or gaskets - Replace defective parts.
Oil viscosity is wrong - Use correct viscosity oil.
Piston rings are defective or worn - Replace piston rings.
Damaged valve stems or valve guides - Valves replacement required.
Scored cylinder liners or pistons - Inspect pistons and liners, change as required.
| Abnormal engine knocking or noise |
Low coolant temperature - Warm up to required temperature.
Low engine oil level - Checking oil level and add if necessary.
Timing of fuel injection pump is incorrect - Adjust as recommended.
Piston wear or scoring - Pistons replacement required.
Connecting rod is misaligned or defective - Replace or align connecting rod.
| Starter motor cranks slow |
Battery voltage is low - Battery is drained, charge it.
Battery discharges quickly - Service charging system or replace battery.
Disconnected battery cables or bad terminals - Connect cables properly or replace terminals.
Battery is low or faulty - Replace or charge as required.
Wiring is improperly connected or disconnected - Check wiring and connect properly.
Battery voltage is low - Recharge the battery.
Starter motor is faulty - Starter should be replaced.
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