Mitsubishi S4L Troubleshooting
| Engine Model: Mitsubishi S4L |
| Engine Type: 4-cycle inline 4-cylinder naturally aspirated liquid-cooled diesel |
| Total Displacement: 91.5 cu.in (1.5 L) |
| Rated Engine Power: 26.7 Hp (19.9 kW) at 2400 rpm |
| Fuel System Type: Indirect fuel injection |
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| Diesel engine hard to start or doesn't start |
Fuel filter element is dirty - Replace filter element.
Air in fuel system - Bleed fuel system.
Defective injection nozzle - Change fuel injection nozzles.
Fuel injection pump damage - Rebuild or replace pump.
Valve timing is wrong - Set the valve timing correctly.
Clogged fuel pipes - Clean or replace fuel pipes.
Injection timing is incorrect - Check injection timing adjustment.
Piston rings and cylinder are worn - Replace defective components.
| Diesel starts but stalls suddenly |
Fuel filter element clogging - Clean the filter element.
Fuel injection pump damage - Change pump or rebuild it.
Clogged air filter - Service air cleaner.
Nozzle opening pressure is incorrect - Set it correctly.
| Engine shuts off suddenly while running |
Improper fuel injection timing - Check the fuel injection pump timing adjustment.
Dirty fuel filter - Service the filter.
Engine not warmed up - Warm up engine as required.
Injection nozzles sticking or clogged - Change or repair injection nozzles.
Wrong adjustment of low idle speed - Need to adjust idle speed.
Valve out of adjustment - Correct valve clearance needs to be set.
Fuel injection pump malfunction - Repair or change injection pump.
Defective or clogged injection nozzle - Test injection nozzles and change if necessary.
Fuel lines or hoses are clogged - Clean fuel hoses and lines.
Dirty air cleaner - Install new air filter element.
Cylinder-head gasket is leaking - Gasket should be replaced.
Injection timing is out of adjustment - Adjust according to specifications.
Fuel injection pump failure - Replacement or repair required.
One of moving engine parts has broken - Replace or repair damaged components.
Radiator fins are clogged or radiator cap is faulty - Clean radiator or change cap.
Low coolant level - The cooling system needs to be refilled and checked for faults.
Excessive wear of the fan belt - Change the fan belt.
Insufficient engine oil - Checking oil level and add if necessary.
Cylinder head gasket is defective - Install a new gasket.
Injection timing is wrong - Set the injection timing correctly.
Low oil level - Checking oil level and add if necessary.
Worn oil pump - Remove and inspect oil pump.
Oil filter element is dirty - Service or replace engine oil filter.
Stuck or defective relief valve - Change or clean relief valve.
Crankshaft bearing clearance is excessive - Test and repair or replace worn parts.
Crankpin bearing clearance is excessive - Test and repair or replace worn parts.
| Engine consuming too much oil |
Oil leaks: Gaskets or seals may be damaged - New components need to be installed.
Oil viscosity is wrong - Use correct viscosity oil.
Worn or broken piston rings - Piston rings need to be replaced.
Valve guides and stems are worn - Replace the valves.
Scuffed pistons or cylinder liners - Check pistons and liners, install new parts as required.
Engine is not fully warmed up - Warm up engine as required.
Lack of engine oil - Check and refill engine oil.
Timing of fuel injection pump is incorrect - Adjust the pump as required.
Pistons are worn or broken - Install new pistons.
Faulty or misaligned connecting rod - Connecting rod must be aligned or replaced.
Battery capacity is low - Battery needs to be recharged.
Battery is draining quickly - Service or change the battery.
Corroded battery terminals or disconnected wires - Check cables and clean or change terminals.
Battery is low or faulty - Recharge or replace battery.
Battery cables are disconnected or incorrectly connected - Check cables and connect as needed.
Battery voltage is low - Low battery charging, charge as required.
Defective starter motor - Repair or replace starter.
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