Volvo Penta D11-725 Troubleshooting
| Engine Model: Volvo Penta D11-725 |
| Engine Type: 4-cycle inline 6-cylinder direct injection liquid-cooled diesel |
| Total Displacement: 661 cu.in (10.8 L) |
| Rated Engine Power: 725 Hp (537 kW) at 1800 rpm |
| Aspiration Type: Turbocharged and aftercooled |
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| Engine difficult to start or will not start |
Clogged fuel filter - Install new filter element.
Air in fuel tank - Bleed fuel tank.
Fuel injection nozzles are faulty or clogged - If necessary, replace with a new nozzle.
Fuel injection pump is damaged - Repair or replace injection pump.
Improper valve timing - Use correct valve timing adjustment.
Fuel pipes are plugged - Service or replace fuel pipes.
Injection timing is wrong - Set up as recommended.
Worn cylinder or piston rings - Replace defective components.
| Diesel starts but then stops |
Fuel filter element clogging - Replace filter element.
Damaged fuel injection pump - Repair or replace injection pump.
Dirty air cleaner - Service or replace the air filter.
Unadjusted nozzle opening pressure - Set it correctly.
| Engine stops unexpectedly during operation |
Wrong setting of fuel injection pump timing - Check the fuel injection pump timing adjustment.
Fuel filter element is clogged - Clean or change the filter.
Coolant temperature is low - Engine is not warmed up to the required temperature.
Injection nozzles are stuck or clogged - Clean or replace injection nozzles.
Low idle speed set incorrectly - Adjust low idle speed.
Valve clearance is wrong - Adjust valve clearance according to specifications.
Fuel injection pump is damaged - Change pump or rebuild it.
| Diesel engine loses power |
Dirty or damaged injection nozzles - Inspect nozzles and replace if necessary.
Restricted fuel lines or hoses - Fuel lines and hoses need to be cleaned.
Plugged air filter - Replace air filter element.
Cylinder head gasket defective - Change cylinder head gasket.
Injection timing is wrong - Adjust according to specifications.
Fuel injection pump is broken - Repair or change injection pump.
One of moving engine parts has broken - Repair or replace defective components.
Defective radiator cap or clogged radiator core - Clean radiator or replace cap.
Engine has a lack of coolant - Fill radiator to proper level and check components for faults.
Loose or defective fan belt - Belt replacement is recommended.
Lack of engine oil - Add oil to the engine crankcase.
Cylinder head gasket is defective - Change cylinder head gasket.
Injection timing is out of adjustment - Adjust as recommended.
Engine oil level low - Add oil as required.
Worn oil pump - Repair or replace.
Oil filter is dirty - Service or replace engine oil filter.
Relief valve is stuck or broken - Change or clean relief valve.
Excessive crankshaft bearing clearance - Inspect and replace or repair faulty parts.
Clearance of crankpin bearing is excessive - Inspect and replace or repair faulty parts.
| Diesel engine consuming too much oil |
Oil leaks: Seals or gaskets are defective - Replace defective parts.
Oil viscosity is incorrect - Use oil of correct viscosity.
Piston rings are seized or worn - Change piston rings.
Valve guides and stems are worn - Install new valves.
Worn pistons or cylinder liners - Check liners and pistons, install new components as required.
| Abnormal engine noise or knocking |
Engine is not warmed up to the required temperature - Normalize the temperature by warming up the engine.
Lack of engine oil - Need to add engine oil.
Fuel injection pump timing is wrong - Adjust the pump as required.
Worn or scored pistons - Install new pistons.
Connecting rod is defective or misaligned - Replace or align connecting rod.
Battery capacity is low - Battery needs to be recharged.
Battery drains quickly - Service battery or change it.
Disconnected battery cables or bad terminals - Check wire connections and change or service terminals.
Battery is low or faulty - Battery needs to be recharged or replaced.
Battery cables are disconnected or incorrectly connected - Check cables and connect as needed.
Low battery power - Low battery charging, charge as required.
Starter motor is faulty - Repair or replace starter.
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