Yanmar 4TNV94FHT Troubleshooting
| Engine Model: Yanmar 4TNV94FHT |
| Engine Type: 4-cycle vertical 4-cylinder direct injection liquid-cooled diesel |
| Total Displacement: 186.3 cu.in (3.05 L) |
| Rated Engine Power: 103.5 Hp (77.2 kW) at 2200 rpm |
| Aspiration Type: Turbocharged |
____________________________________________________________________________________
| Diesel engine hard to start or doesn't start |
Fuel filter plugged - Change the filter element.
Air in fuel system - Bleed fuel system.
Clogged or burnt injection nozzle - If necessary, replace with a new nozzle.
Fuel injection pump is not working correctly - Rebuild or change fuel pump.
Incorrect valve timing - Correct or change timing gear.
Restricted fuel pipes - Service or replace fuel pipes.
Injection timing is improper - Set up as recommended.
Worn cylinder or piston rings - Replace faulty components.
| Diesel starts and stalls immediately |
Fuel filter plugging - Replace filter element.
Damaged fuel injection pump - Repair or replace injection pump.
Intake air restriction - Clean or replace element.
Nozzle opening pressure is not adjusted - Adjust as recommended.
| Engine stops running suddenly |
Fuel injection timing is wrong - Adjust as recommended.
Fuel filter element clogging - Change the filter element.
Engine is cold - Warm up the engine.
Injection nozzles are burnt or jammed - Service or change injection nozzles.
| Engine shuts off while idling |
Incorrectly adjusted low idle speed - Adjust low idling as recommended.
Valve clearance is not correct - Need to adjust valve clearance.
Fuel injection pump damage - Replace or rebuild injection pump.
Dirty or faulty injection nozzles - Test injection nozzles and change if necessary.
Clogged fuel lines or hoses - Clean fuel lines and hoses.
Intake air restriction - Install new air filter element.
Damaged cylinder-head gasket - Replace cylinder head gasket.
Incorrect injection timing - Adjust injection timing as required.
Fuel injection pump is faulty - Replace or repair injection pump.
Any of moving engine parts is worn - Repair or replace defective components.
Clogged radiator core or damaged radiator cap - Clean radiator or change cap.
Lack of coolant in cooling system - Add coolant and check the components of cooling system.
Loose or defective fan belt - Fan belt must be replaced.
Engine oil level low - Check and refill engine oil.
Cylinder head gasket is blown - Change cylinder head gasket.
Injection timing is improper - Adjust injection timing as required.
Low oil level - Check oil level and add oil as required.
Oil pump is damaged - Repair or change.
Clogged oil filter element - Service or change engine oil filter element.
Worn or dirty relief valve - Replace or clean relief valve.
Excessive oil clearance of crankshaft bearing - Test and repair or replace worn parts.
Clearance of crankpin bearing is excessive - Test and replace or repair worn components.
| High engine oil consumption |
Oil leaks: Defective seals or gaskets - To repair leaks, replace worn parts.
Oil viscosity is incorrect - Use correct viscosity oil.
Damaged or seized piston rings - Change piston rings.
Worn valve guides and valve stems - Replace defective valves.
Worn cylinder liners or pistons - Check pistons and liners, change as required.
| Abnormal engine noise or knocking |
Coolant temperature is low - Warm up engine as required.
Engine oil level is low - Fill up the oil to required level.
Wrong setting of fuel injection pump timing - Adjust as recommended.
Worn or scored pistons - Pistons replacement required.
Connecting rod is not aligned or worn - Alignment procedure or replacement is required.
Low battery capacity - Recharge the battery.
Battery runs out quickly - Battery needs service or replacement.
Battery cables are disconnected or terminals are faulty - Check cables and clean or change terminals.
Battery is drained or worn - Need to charge or replace the battery.
Battery cables are disconnected or incorrectly connected - Check cables and connect as needed.
Low battery capacity - Charge the battery.
Starter motor is defective - Repair or install a new starter.
____________________________________________________________________________________
| Industrial Engines Technical Specifications |
| Small Engines Technical Specifications |
| Car Engines Technical Specifications |
| Outboard Engines Technical Specifications |
