Yanmar 3TNV88C Troubleshooting
| Engine Model: Yanmar 3TNV88C |
| Engine Type: 4-cycle vertical 3-cylinder direct injection liquid-cooled diesel |
| Total Displacement: 100.1 cu.in (1.64 L) |
| Rated Engine Power: 37.3 Hp (27.5 kW) at 3000 rpm |
| Aspiration Type: Naturally aspirated |
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| Engine starts up hard or won't start |
Fuel filter element is clogged - Clean or change the filter.
There is air in the fuel system - Bleed the system.
Clogged or burnt injection nozzle - Install a new kit of correctly balanced nozzles.
Damaged fuel injection pump - Rebuild or replace pump.
Valve timing is out of adjustment - Use correct valve timing adjustment.
Restricted fuel pipes - Clean or change fuel pipes.
Unadjusted injection timing - Adjust injection timing as required.
Damaged piston rings and cylinder - Replace faulty parts.
| Engine stalls after starting |
Dirty fuel filter - Filter maintenance required.
Fuel injection pump malfunctioning - Repair or install new pump.
Air filter is clogged - Change air filter element.
Nozzle opening pressure is improper - Adjust as recommended.
| Engine shuts off suddenly while running |
Wrong setting of fuel injection pump timing - Use the correct fuel injection pump timing adjustment.
Fuel filter element is clogged - Service the filter.
Engine is cold - Engine is not warmed up to the required temperature.
Injection nozzles sticking or clogged - Clean or change injection nozzles.
Wrong adjustment of low idle speed - Correct low idle settings.
Excessive valve clearance - Adjust valve clearance.
Fuel injection pump is not operating properly - Replace or rebuild injection pump.
Fuel injection nozzles are damaged or dirty - Test injection nozzles and change if necessary.
Dirty fuel lines or hoses - Clean fuel system hoses and lines.
Dirty air filter element - Install new air filter element.
Cylinder-head gasket is broken - Change cylinder head gasket.
Injection timing is wrong - Check injection timing adjustment.
Faulty fuel injection pump - Rebuild or change fuel pump.
Any of moving engine parts is worn - Repair or replace defective components.
Clogged radiator fins or damaged radiator cap - Clean radiator or replace cap.
Low engine coolant - Add coolant fluid and inspect the cooling system for leaks.
Excessive wear of the fan belt - Belt change is required.
Insufficient engine oil - Need to add engine oil.
Cylinder head gasket is defective - Install new cylinder head gasket.
Injection timing is out of adjustment - Set the injection timing correctly.
Oil level is insufficient - Check and refill the oil.
Oil pump malfunction - Install a new pump.
Oil filter element clogging - Service or replace engine oil filter.
Stuck or defective relief valve - Change or service relief valve.
Excessive crankshaft bearing clearance - Check and change or repair defective parts.
Excessive crankpin bearing clearance - Test and repair or replace worn parts.
| Engine using too much oil |
Oil leakage: Defective seals or gaskets - Defective components must be replaced.
Crankcase oil too light - Use correct viscosity oil.
Piston rings are seized or worn - Replace piston rings.
Valve stems or guides are damaged - Replace the valves.
Pistons or cylinder liners are worn - Inspect liners and pistons, fit new parts as necessary.
Engine is cold - Warm up the engine.
Engine oil insufficient - Need to add engine oil.
Improper setting of fuel injection pump timing - Adjust fuel injection pump as required.
Pistons are worn or broken - Pistons replacement required.
Connecting rod is worn or not aligned - Replace or align connecting rod.
| Starter motor cranks slow |
Battery capacity is low - Recharge the battery.
Battery is not holding charge - Service battery or change it.
Bad terminals or disconnected battery cables - Connect wiring correctly or install new terminals.
Battery is low or faulty - Need to charge or replace the battery.
Battery cables are disconnected or improperly connected - Inspect cables and connect properly.
Battery power is low - Battery is drained, charge it.
Defective starter motor - Repair or install a new starter.
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