Mitsubishi 8DC8 Troubleshooting
| Engine Model: Mitsubishi 8DC8 |
| Engine Type: 4-cycle 8-cylinder V-block naturally aspirated liquid-cooled diesel |
| Total Displacement: 908.4 cu.in (14.88 L) |
| Rated Engine Power: 275-305 Hp (202-225 kW) at 2200 rpm |
| Fuel System Type: Direct injection |
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| Engine starts up hard or doesn't start |
Clogged fuel filter - Clean or change the filter.
Air in fuel tank - Bleed fuel tank.
Clogged injection nozzle - Clean or change injection nozzles.
Fuel injection pump malfunctioning - Replacement or repair required.
Incorrect valve timing - Adjust or change timing gear.
Fuel pipes are plugged - Clean or change fuel pipes.
Improper injection timing - Use correct injection timing adjustment.
Excessive wear of piston rings and cylinder - Replace faulty components.
| Diesel starts and suddenly stops |
Fuel filter plugging - Change filter element.
Fuel injection pump malfunctioning - Rebuild or replace pump.
Dirty air filter - Air filter maintenance required.
Nozzle opening pressure is not adjusted - Adjust as recommended.
| Engine stops unexpectedly during operation |
Timing of fuel injection pump is incorrect - Set it up as required.
Dirty fuel filter - Replace the filter element.
Engine is not fully warmed up - Warm up to required temperature.
Stuck or clogged injection nozzle - Change or repair injection nozzles.
| Engine stalls when idling |
Low idle speed adjustment is incorrect - Test and adjust.
Valve clearance is out of adjustment - Correct valve clearance needs to be set.
Faulty fuel injection pump - Replacement or repair required.
| Engine is not running at maximum power |
Faulty or dirty injection nozzles - Service or change injection nozzles.
Restricted fuel hoses or lines - Fuel lines and hoses need to be cleaned.
Dirty air cleaner - Air filter maintenance required.
Cylinder head gasket is defective - Cylinder-head gasket replacement required.
Incorrect injection timing - Check injection timing adjustment.
Fuel injection pump malfunctioning - Repair or replace injection pump.
One of moving engine components is worn - Replace or repair damaged components.
Clogged radiator fins or leaking radiator cap - Change cap or clean radiator.
Low engine coolant - Top up coolant fluid and check system for leaks.
Fan belt slipping or worn - Replace the fan belt.
Insufficient engine oil - Fill up the engine oil.
Cylinder head gasket is damaged - Replace cylinder head gasket.
Incorrect injection timing - Adjust according to specifications.
| Insufficient oil pressure |
Engine oil level low - Fill up the engine oil.
Defective oil pump - Repair or replace.
Oil filter is clogged - Replace or service engine oil filter.
Relief valve is stuck or worn - Change or clean relief valve.
Clearance of crankshaft bearing is excessive - Inspect and change or repair worn components.
Crankpin bearing clearance is excessive - Test and replace or repair worn components.
Oil leaking: Defective seals or gaskets - Replace defective parts.
Crankcase oil too light - Use proper viscosity oil.
Piston rings are stuck or worn - Piston rings replacement required.
Valve stems or guides are damaged - Replace the valves.
Scored pistons or cylinder liners - Check liners and pistons, change as required.
Engine is not preheated - Normalize the temperature by warming up the engine.
Insufficient engine oil - Need to add engine oil.
Fuel injection pump timing is wrong - Set up as recommended.
Pistons are worn or scored - Install new pistons.
Connecting rod misalignment or failure - Replace or align connecting rod.
Battery capacity is low - Battery is drained, charge it.
Battery is draining quickly - Service battery or change it.
Disconnected wires or corroded battery terminals - Check cable connections and replace or service terminals.
Battery is low or faulty - Recharge or replace battery.
Battery cables are disconnected or incorrectly connected - Check cables and connect as needed.
Low battery output - Battery needs to be recharged.
Starter motor failure - Change or repair starter.
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