International D188 Troubleshooting
| Engine Model: International Harvester D188 |
| Engine Type: 4-cycle inline 4-cylinder naturally aspirated liquid-cooled diesel |
| Total Displacement: 187.5 cu.in (3.07 L) |
| Rated Engine Power: 40-46 Hp (29-34 kW) at 2200 rpm |
| Fuel System Type: Indirect fuel injection |
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| Engine starts up hard or won't start |
Clogged fuel filter - Service the filter.
Air in the fuel lines - Bleed the fuel lines.
Fuel injection nozzles are damaged - Change fuel injection nozzles.
Fuel injection pump is damaged - Replacement or repair required.
Wrong valve timing - Correct or change timing gear.
Plugged fuel pipes - Clean fuel pipes.
Injection timing is wrong - Adjust injection timing as required.
Worn cylinder or piston rings - Replace faulty parts.
Fuel filter element clogging - Clean the filter or install new filter element.
Fuel injection pump is not working correctly - Rebuild or install a new injection pump.
Air filter is dirty - Change air filter element.
Nozzle opening pressure is improper - Adjust as required.
| Engine stops unexpectedly during operation |
Incorrect adjustment of fuel injection pump timing - Set the fuel pump timing correctly.
Fuel filter element is clogged - Clean the filter element.
Coolant temperature is low - Warm up the engine.
Injection nozzles sticking or clogged - Repair or change injection nozzles.
| Engine stalls when idling |
Low idle speed set incorrectly - Test and adjust.
The valve clearance is not adjusted - Adjust valve clearance according to specifications.
Fuel injection pump is faulty - Rebuild or install a new injection pump.
Defective injection nozzle - Change fuel injection nozzles.
Fuel lines or hoses clogging - Clean fuel lines and hoses.
Clogged air filter - Clean air cleaner element.
Leaking cylinder head gasket - Gasket should be replaced.
Improper injection timing - Adjust according to specifications.
Fuel injection pump is defective - Rebuild or replace pump.
One of moving engine components has failed - Replace or repair damaged components.
Defective radiator cap or clogged radiator core - Clean radiator or install new cap.
Coolant level is low - Top up coolant fluid and check system for leaks.
Fan belt is worn or faulty - Install new fan belt.
Engine oil level is insufficient - Check and refill engine oil.
Worn cylinder head gasket - Install new cylinder head gasket.
Unadjusted injection timing - Adjust as recommended.
| Oil pressure is insufficient |
Lack of oil - Need to add oil.
Oil pump malfunction - Install a new pump.
Oil filter is dirty - Service or replace engine oil filter.
Relief valve is stuck or broken - Replace or service relief valve.
Clearance of crankshaft bearing is excessive - Inspect and change or repair worn components.
Excessive oil clearance of crankpin bearing - Check and change or repair defective parts.
| Excessive oil consumption |
Oil leakage: Seals or gaskets are wearing excessively - Replace worn parts to avoid leaks.
Wrong oil viscosity - Use correct viscosity oil.
Damaged or seized piston rings - Change piston rings.
Valve stems or guides are damaged - Valves need to be changed.
Worn cylinder liners or pistons - Check liners and pistons, change as required.
| Abnormal engine noise or knocking |
Coolant temperature is low - Warm up engine as required.
Engine oil level is insufficient - Check and refill engine oil.
Incorrect adjustment of fuel injection pump timing - Set it up as required.
Worn or broken pistons - Replace the pistons as required.
Connecting rod is misaligned or defective - Connecting rod must be aligned or replaced.
Battery capacity is low - Charge the battery.
Battery is not holding charge - Service battery or replace it.
Corroded battery terminals or disconnected wires - Check battery wires and service or replace terminals.
Battery is discharged or worn - Recharge or replace battery.
Disconnected or incorrectly connected wires - Inspect battery wires and connect correctly.
Low battery voltage - Charge the battery.
Faulty starter motor - Repair or replace starter.
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