Yanmar 4TNV88 Troubleshooting
| Engine Model: Yanmar 4TNV88 |
| Engine Type: 4-cycle 4-cylinder direct injection liquid-cooled diesel |
| Total Displacement: 133.6 cu.in (2.19 L) |
| Rated Engine Power: 47.4 Hp (35.4 kW) at 3000 rpm |
| Aspiration Type: Naturally aspirated |
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| Engine difficult to start or won't start |
Fuel filter plugged - Filter maintenance required.
There is air in the fuel system - Bleed the system.
Faulty or dirty injection nozzles - Clean or change injection nozzles.
Fuel injection pump is not operating properly - Install a new pump or rebuild.
Valve timing is out of adjustment - Correct or replace timing gear.
Dirt in the fuel lines or hoses - Clean or replace fuel pipes.
Injection timing is improper - Check injection timing adjustment.
Cylinder or piston rings are worn - Change faulty components.
| Diesel starts and then shuts off |
Dirty fuel filter - Change filter element.
Fuel injection pump is not working correctly - Replace or rebuild injection pump.
Clogged air filter element - Carry out maintenance on air filter.
Nozzle opening pressure is improper - Set up as recommended.
| Engine stalls after running |
Fuel injection timing is not adjusted - Set it up as required.
Fuel filter element clogging - Clean the filter element.
Engine is not fully warmed up - Engine is not warmed up to the required temperature.
Injection nozzles are burnt or jammed - Check injection nozzles and replace if required.
Low idle speed adjustment is incorrect - Need to adjust idle speed.
Valve clearance is not correct - Check and adjust as required.
Fuel injection pump is faulty - Install a new fuel pump or repair.
Faulty or dirty injection nozzles - Install a new kit of correctly balanced nozzles.
Fuel hoses or lines clogging - Fuel lines and hoses need to be cleaned.
Dirty air cleaner - Clean or replace element.
Cylinder head gasket is defective - Change cylinder head gasket.
Injection timing is out of adjustment - Adjust according to specifications.
Fuel injection pump is damaged - Replace or repair injection pump.
Any of moving engine parts is worn - Replace or repair damaged components.
Dirty radiator core or defective radiator cap - Clean radiator or replace cap.
Coolant level is low - Add coolant fluid and inspect the cooling system for leaks.
Loose or defective fan belt - If necessary, replace the belt.
Engine oil level is low - Fill up the oil to required level.
Cylinder head gasket is worn - Replace cylinder head gasket.
Incorrect injection timing - Set the injection timing correctly.
Not enough oil in the engine - Add oil as required.
Defective oil pump - Install a new pump.
Oil filter element clogged - Change or service engine oil filter.
Relief valve is stuck or broken - Replace or service relief valve.
Clearance of crankshaft bearing is excessive - Test and repair or replace worn parts.
Clearance of crankpin bearing is excessive - Inspect and replace or repair faulty components.
Oil leaks: Gaskets or seals are excessively worn - Install new components.
Oil viscosity is wrong - Use oil of correct viscosity.
Piston rings are stuck or worn - Replace piston rings.
Valve stems and guides are worn - Install new valves.
Scored cylinder liners or pistons - 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.
Low engine oil level - Check oil level and add oil as required.
Wrong setting of fuel injection pump timing - Set it up as required.
Scored or worn pistons - Pistons need to be replaced.
Connecting rod is defective or misaligned - Need to replace or align the connecting rod.
Battery voltage is low - Charge the battery.
Battery runs out quickly - Service charging system or change battery.
Battery cables are disconnected or terminals are faulty - Connect wires properly or change terminals.
Battery is drained or defective - Charge or replace the battery.
Disconnected or improperly connected wiring harness - Inspect battery wiring harness and connect as required.
Low battery voltage - Battery needs to be recharged.
Damaged starter motor - Starter needs to be replaced.
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