Suzuki DF140B Troubleshooting
| Engine Model: Suzuki DF140B |
| Engine Type: 4-stroke inline 4-cylinder DOHC 16-valve gasoline outboard engine |
| Total Displacement: 124.8 cu.in (2 L) |
| Rated Engine Power: 140 Hp (103 kW) at 6000 rpm |
| Fuel System: Multi point sequential electronic fuel injection |
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| Engine will not start or hard to start |
Empty gas tank - Add gasoline.
Low-quality gasoline - Use quality fuel.
Dirt and debris in fuel system - Remove debris and dirt.
Spark plug wire is loose or disconnected - Inspect the spark plug wire connection, replace or repair.
Spark plug is damaged - Spark plug need to be replaced.
Fuel filter is dirty - Change fuel filter.
Worn or damaged vapor separator needle valve - Install new needle valve.
Fuel lines are dirty - Clean fuel system lines.
Fuel tank air vent clogged or closed - Open or service air vent.
Fuel feed pump is faulty - Change or rebuild fuel feed pump.
Throttle cable is worn or adjusted improperly - Replace cable or adjust properly.
Improper valve clearance - Need to adjust valve clearance.
Valve timing is wrong - Adjust valve timing correctly.
Fuel pressure is low - Check system for fuel leaks or check low pressure fuel pump.
Fuel injector is clogged or malfunction - Clean or install new injector.
Fuel regulator malfunction - Install new fuel regulator.
ECM is not functioning - Change electronic control modul.
| Engine starts but immediately stops |
Spark plug is faulty - Spark plug need to be replaced.
Worn or defective vapor separator needle valve - Install new needle valve.
Faulty ignition coil - Ignition coil should be replaced.
Fuel tank air vent closed or restricted - Open or clean air vent.
Fuel pump defective - Install new pump or repair it.
Faulty choke system - Inspect and replace choke system components.
Valve clearance is incorrect - Adjust valve clearance.
Valve timing is improper - Adjust valve timing correctly.
Broken or loose valve springs - Install new valve springs.
Valves are stuck - Clean the valves.
Low cylinder compression - Inspect and replace defective parts.
Plugged fuel filter - Replace fuel filter.
Damaged or clogged fuel injector - Clean or replace if necessary.
Engine oil level is low - Fill up the engine oil.
Defective oil pump - Replace oil pump.
Water intake is blocked - Need to wash or clean.
Thermostat failure - Thermostat need to be replaced.
Damaged water pump - Install new water pump.
| Engine runs intermittently |
Ignition system malfunction - Inspect ignition system and change failed components.
Dirty or damaged fuel pump - Service or change fuel pump.
Worn or damaged vapor separator needle valve - Change vapor separator needle valve.
Fuel lines clogging - Service fuel lines.
Fuel tank air vent closed or restricted - Open or clean air vent.
Fuel filter is clogged - Replace fuel filter.
Intake manifold air leaks - Replace intake manifold gasket.
Water intake is clogged - Need to wash or clean.
Throttle link and throttle valve are worn or damaged - Change faulty parts.
Clogged or worn fuel injector - Clean or replace as required.
Excessive engine load - Load reducing is recommended.
Fuel pump or fuel injector is clogged - Clean or replace if necessary.
Incorrect ignition timing - Ignition timing needs to be set properly.
Damaged thermostat - Change thermostat.
Water pump malfunction - Change water pump.
Incorrect propeller selection - Install correct propeller.
Propeller bent or damaged - Replace propeller.
Outboard motor is positioned too low or too high - Position the engine correctly.
Not enough engine oil - Checking oil level and add if necessary.
Faulty oil pump - Change oil pump.
Clogged water intake - Wash or clean as required.
Wrong valve setting - Valves needs to be set correctly.
| Abnormal engine noise or knocking |
Stale or low octane fuel - Use correct fuel.
Engine is running overloaded - Reduce the load.
Incorrect low idle setting - Adjustment required.
Fuel pump is damaged or dirty - Service or change fuel pump.
Main bearings or crankshaft failure - Change or repair worn components.
Damaged piston rings or cylinder bore - Change defective parts.
Clogged fuel lines - Clean fuel system lines.
Faulty fuel injector - Change fuel injector.
Fuel pump is defective or dirty - Service or change fuel pump.
Ignition system is defective - Check ignition and replace faulty components.
Defective cylinder head gasket - Replace cylinder head gasket.
Damaged powerhead components - Defective parts need to be replaced.
Valves are burned or stuck - Clean or replace valves.
Incorrect propeller selection - Check the propeller size.
Damaged or improper size of propeller - Have propeller repaired or replaced.
Outboard engine mounting height improperly - Have motor adjusted to proper transom height.
Trim angle is incorrect - Make the correct trim angle adjustment.
Damaged or clogged fuel injector - Replace or clean as required.
Loose or faulty spark plug - Re-tighten or replace spark plug.
Rings, sleeve, or piston are damaged - Replace defective parts as required.
Electronic control unit is not operating - Replace ECU.
Damaged or improper size of propeller - Replace propeller.
Damaged propeller shaft - Replace propeller shaft.
Weeds in the propeller - Clean the propeller.
Motor mounting bolt is loose - Tighten bolt.
Loose or faulty steering pivot Tighten correctly or replace.
Low battery output voltage - Battery is drained, recharge it.
Battery is not holding charge - Service battery or change it.
Faulty battery terminals or disconnected cables - Connect cables correctly or replace terminals.
Defective starter motor - Starter should be replaced.
| Trim motor is running but trim system cannot move up or down |
Oil level is insufficient - Fill up oil to required level.
Pump assembly is faulty - Test pump and replace if necessary.
Manual release valve leaking - Close the valve or change it.
Faulty pump driveshaft or motor - Change defective component.
| Trim does not fully up or down |
Pump assembly is damaged - Change pump.
Tilt ram piston ball is not positioned correctly - Service or repair.
Worn tilt ram piston O-ring - Replace O-ring.
Oil insufficient - Fill up oil to required level.
Lower check valve is not properly secured in port side trim ram - Secure valve properly.
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