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| Home / Car Engines / Toyota Engines / Toyota 1HD-T |
Toyota 1HD-T Troubleshooting
| Engine starts hard or won't start |
Fuel filter element clogging - Change filter element.
Air in fuel system - Bleed fuel system.
Fuel injection nozzles are faulty or clogged - Clean or change injection nozzles.
Fuel injection pump is defective - Rebuild or replace pump.
Valve timing is out of adjustment - Adjust or change timing gear.
Plugged fuel pipes - Clean or replace fuel pipes.
Incorrect injection timing - Adjust according to specifications.
Worn piston rings and cylinder - Replace defective parts.
| Diesel starts and suddenly stops |
Fuel filter element clogging - Clean or replace the filter.
Fuel injection pump failure - Replace or repair injection pump.
Air filter element clogged - Replace air filter element.
Unadjusted nozzle opening pressure - Set up as recommended.
| Engine shuts off suddenly during operation |
Incorrect adjustment of fuel injection pump timing - Adjust according to specifications.
Fuel filter plugged - Clean or change the filter.
Coolant temperature is low - Engine is not warmed up to the required temperature.
Stuck or burnt injection nozzle - Clean or change injection nozzles.
| Engine stalls when idle |
Incorrect low idle setting - Test and adjust.
Valve clearance is wrong - Adjust valve clearance.
Fuel injection pump is not working correctly - Replace or repair injection pump.
| Engine power is too low |
Clogged or defective injection nozzles - Check injection nozzles and replace if required.
Dirt in the fuel hoses or lines - Clean fuel lines and hoses.
Air filter plugged - Clean or replace element.
Damaged cylinder-head gasket - Cylinder-head gasket replacement required.
Incorrect injection timing - Adjust as recommended.
Fuel injection pump is broken - Repair or change injection pump.
One of moving engine parts has broken - Repair or replace defective components.
| Engine overheated |
Dirty radiator fins or faulty radiator cap - Clean radiator or replace cap.
Engine has a lack of coolant - Add coolant fluid to cooling system and also check it for leaks.
Fan belt is worn or faulty - Change the fan belt.
Insufficient engine oil - Fill up the oil to required level.
Worn cylinder head gasket - Cylinder-head gasket replacement required.
Unadjusted injection timing - Adjust according to specifications.
| Low oil pressure |
Engine oil insufficient - Checking oil level and add if necessary.
Oil pump is defective - Remove and inspect oil pump.
Clogged oil filter element - Service or replace engine oil filter.
Relief valve is stuck or broken - Change or clean relief valve.
Crankshaft bearing clearance is excessive - Test and repair or replace worn parts.
Excessive oil clearance of crankpin bearing - Test and repair or replace worn parts.
| Excessive oil consumption |
Oil leaks: Damaged gaskets or seals - Replace to repair leaks.
Oil viscosity is wrong - Use proper viscosity oil.
Worn or broken piston rings - Replace piston rings.
Valve guides or stems are damaged - Valves replacement required.
Damaged pistons or cylinder liners - Inspect pistons and liners, change as required.
| Engine knocking sound or abnormal noise |
Engine is not warmed up to the required temperature - Warm up engine as required.
Engine oil insufficient - Check oil level and add oil as required.
Wrong setting of fuel injection pump timing - Adjust according to specifications.
Piston wear or scoring - Replace the pistons as required.
Connecting rod failure or misalignment - Connecting rod needs to be aligned or changed.
| Starter turning slow |
Battery power is low - Low battery charging, charge as required.
Battery won’t hold charge - Service battery or change it.
Battery terminals are corroded or wires are disconnected - Check battery wires and service or replace terminals.
| Starter is not cranking |
Battery is low or faulty - Recharge or replace battery.
Battery cables are disconnected or improperly connected - Inspect cables and connect properly.
Low battery voltage - Low battery charging, charge as required.
Starter motor failure - Starter needs to be changed.
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