Yanmar 3TNV88 Troubleshooting
| Engine Model: Yanmar 3TNV88 |
| Engine Type: 4-cycle 3-cylinder direct injection liquid-cooled diesel |
| Total Displacement: 100.2 cu.in (1.64 L) |
| Rated Engine Power: 36.3 Hp (27.1 kW) at 3000 rpm |
| Aspiration Type: Naturally aspirated |
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| Engine starts hard or won't start |
Fuel filter element is dirty - Service or replace the filter.
Air in the fuel system - Air bleeding.
Faulty fuel injection nozzles - Replace injection nozzles.
Damaged fuel injection pump - Repair or install new pump.
Valve timing is incorrect - Use correct valve timing adjustment.
Dirt in the fuel lines or hoses - Service or change fuel pipes.
Wrong injection timing - Set up as recommended.
Damaged piston rings and cylinder - Replace defective parts.
| Engine starts and then shuts off |
Fuel filter element is dirty - Clean or replace the filter.
Fuel injection pump malfunction - Install a new pump or rebuild.
Intake air restriction - Clean air cleaner element.
Nozzle opening pressure is not adjusted - Adjust as recommended.
| Engine shuts off while running |
Fuel injection timing is not adjusted - Adjust according to specifications.
Fuel filter element is clogged - Clean the filter element.
Coolant temperature is low - Engine is not warmed up to the required temperature.
Stuck or burnt injection nozzle - Check injection nozzles and replace if required.
Incorrect low idle setting - Adjust as required.
Valve out of adjustment - Adjust valve clearance.
Fuel injection pump is damaged - Replace or repair injection pump.
Dirty or faulty injection nozzles - Check injection nozzles and replace if required.
Clogged fuel lines or hoses - Service fuel lines and hoses.
Intake air restriction - Service air cleaner.
Defective cylinder head gasket - Replace the gasket as required.
Improper injection timing - Adjust according to specifications.
Fuel injection pump is damaged - Rebuild or replace pump.
One of moving engine parts is faulty - Replace or repair damaged components.
Defective radiator cap or clogged radiator core - Clean radiator or install new cap.
Not enough coolant - Add coolant fluid to cooling system and also check it for leaks.
Broken or loose fan belt - Fan belt must be replaced.
Not enough engine oil - Add oil to the engine crankcase.
Damaged cylinder-head gasket - Replace the gasket as required.
Injection timing is improper - Adjust according to specifications.
Oil level is insufficient - Add oil to the engine crankcase.
Oil pump failure - Repair or replace.
Clogged oil filter - Replace or clean engine oil filter element.
Stuck or worn relief valve - Change or service relief valve.
Clearance of crankshaft bearing is excessive - Inspect and change or repair worn components.
Excessive crankpin bearing clearance - Check and replace or repair defective parts.
Oil leakage: Worn seals or gaskets - Replace defective parts.
Oil viscosity is wrong - Fill up with the correct oil viscosity.
Stuck or worn piston rings - Change the piston rings as required.
Damaged valve guides or valve stems - Install new valves.
Worn cylinder liners or pistons - Check liners and pistons, replace as required.
| Abnormal engine noise or knocking |
Engine is not preheated - Warm up engine as required.
Engine oil level is insufficient - Check and refill engine oil.
Fuel injection pump timing is wrong - Set the fuel pump timing correctly.
Broken or worn pistons - Replace the pistons as required.
Connecting rod misalignment or failure - Need to change or align the connecting rod.
| Starter motor cranks slow |
Low battery capacity - Low battery charging, charge as required.
Battery will not hold charge - Battery needs to be serviced or replaced.
Terminals are faulty or battery cables are disconnected - Check cable connections and change or clean terminals.
Battery is low or faulty - Recharge or change battery.
Wiring is incorrectly connected or disconnected - Inspect wiring and connect correctly.
Low battery voltage - Low battery charging, charge as required.
Defective starter motor - Starter should be replaced.
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