Mitsubishi S12R Troubleshooting
| Engine Model: Mitsubishi S12R |
| Engine Type: 4-cycle 12-cylinder V-block turbocharged liquid-cooled diesel |
| Total Displacement: 2992 cu.in (49.03 L) |
| Rated Engine Power: 1140-1904 Hp (850-1420 kW) at 1500-1800 rpm |
| Fuel System Type: Direct injection |
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| Engine difficult to start or doesn't start |
Dirty fuel filter - Filter maintenance required.
Air trapped in fuel system - Bleed air.
Fuel injection nozzles are faulty or clogged - Inspect nozzles and replace if necessary.
Fuel injection pump is not operating properly - Rebuild or install a new injection pump.
Valve timing is out of adjustment - Use correct valve timing adjustment.
Fuel pipes clogging - Service fuel pipes.
Injection timing is incorrect - Adjust as recommended.
Excessive wear of piston rings and cylinder - Replace faulty parts.
Fuel filter plugged - Replace the filter element.
Defective fuel injection pump - Rebuild or replace pump.
Dirty air filter - Replace air filter element.
Nozzle opening pressure is not adjusted - Set it correctly.
| Engine stops unexpectedly during operation |
Improper fuel injection timing - Adjust according to specifications.
Fuel filter plugged - Service the filter.
Engine not warmed up - Warm up to required temperature.
Injection nozzles are jammed or clogged - Repair or replace injection nozzles.
| Engine stops at low idle speed |
Low idle speed set incorrectly - Normalize low idle speed.
Incorrect valve clearance - Check and adjust as required.
Fuel injection pump is faulty - Rebuild or install a new injection pump.
Damaged or dirty injection nozzles - Test injection nozzles and change if necessary.
Fuel hoses or lines clogging - Fuel lines and hoses need to be cleaned.
Dirty air filter - Clean air cleaner element.
Cylinder-head gasket is broken - Cylinder-head gasket replacement required.
Incorrect injection timing - Adjust according to specifications.
Fuel injection pump is defective - Replace or repair injection pump.
Any of moving engine components is faulty - Repair or replace defective components.
Dirty radiator fins or defective radiator cap - Clean radiator or install new cap.
Engine coolant is insufficient - Fill radiator to proper level and check components for faults.
Fan belt slipping or worn - Change as required.
Low engine oil level - Checking oil level and add if necessary.
Worn cylinder head gasket - Replace the gasket as required.
Injection timing is wrong - Use correct injection timing adjustment.
Lack of oil - Add oil as required.
Oil pump is defective - Remove and inspect oil pump.
Oil filter element clogging - Clean or change engine oil filter.
Relief valve is stuck or worn - Replace or service relief valve.
Clearance of crankshaft bearing is excessive - Test and replace or repair worn components.
Excessive crankpin bearing clearance - Check and change or repair defective parts.
| Engine oil consumption is too high |
Oil leaks: Damaged gaskets or seals - Change to repair leaks.
Improper oil viscosity - Use proper viscosity oil.
Piston rings are defective or worn - Piston rings replacement required.
Damaged valve guides or valve stems - Valves replacement required.
Scuffed pistons or cylinder liners - Check liners and pistons, change as required.
| Abnormal engine knocking or noise |
Engine not warmed up - Warm up to required temperature.
Insufficient engine oil - Fill the crankcase with engine oil.
Improper fuel injection timing - Use the correct fuel injection pump timing adjustment.
Worn or broken pistons - Have pistons replaced.
Connecting rod is worn or misaligned - Align or replace connecting rod.
Low battery power - Low battery charging, charge as required.
Battery does not hold charge - Battery needs to be serviced or replaced.
Battery cables are disconnected or terminals are faulty - Connect cables correctly or replace terminals.
Battery is drained or defective - Battery needs to be recharged or replaced.
Battery wiring is disconnected or improperly connected - Inspect wiring and connect as required.
Low battery output voltage - Battery is drained, recharge it.
Faulty starter motor - Repair or install a new starter.
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