Suzuki DF140BTL Troubleshooting
| Engine Model: Suzuki DF140BTL |
| 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 |
____________________________________________________________________________________
| Engine doesn't start or hard to start |
Fuel tank is empty - Fill gasoline up.
Low-quality gasoline - Change gasoline.
Dirty fuel lines - Inspect and clean.
Loose or disconnected spark plug wire - Inspect the spark plug wire connection, replace or repair.
Spark plug is faulty - Change spark plug.
Dirty fuel filter - Fuel filter needs to be replaced.
Vapor separator needle valve is bend or wear - Change vapor separator needle valve.
Restricted fuel lines - Service fuel lines.
Closed or restricted fuel tank air vent - Open or clean air vent.
Fuel feed pump failure - Fuel feed pump need to be replaced.
Unadjusted or worn throttle cable - Adjust properly or change the cable.
Improper valve clearance - Need to adjust valve clearance.
Wrong valve timing - Set the valve timing correctly.
Fuel pressure is low - Inspect fuel system for leaks or inspect low pressure fuel pump.
Fuel injector is clogged or malfunction - Replace or clean if necessary.
Fuel regulator is defective - Replace fuel regulator.
Electronic control modul is not operating - Install new ECM.
| Engine starts but immediately stops |
Faulty spark plug - Spark plug need to be replaced.
Vapor separator needle valve is bend or wear - Install new needle valve.
Ignition coil is defective - Replace ignition coil as necessary.
Fuel tank air vent closed or restricted - Open or clean air vent.
Fuel pump defective - Change or rebuild fuel pump.
Choke system is damaged - Check and repair choke system.
Valve clearance is wrong - Adjust to proper valve clearance.
Valve timing is incorrect - Adjust valve timing as required.
Valve springs are weak or broken - Replace valve springs.
Valves are stuck - Valves must be cleaned.
Low cylinder compression - Check and change damaged parts.
Plugged fuel filter - Fuel filter needs changing.
Dirty or faulty fuel injector - Clean or install new injector.
Insufficient engine oil - Check and refill engine oil.
Oil pump failure - Replace oil pump.
Dirty water intake screen - Wash or clean as required.
Faulty thermostat - Install new thermostat.
Damaged water pump - Water pump need to be replaced.
Defective ignition system - Inspect ignition system and change failed components.
Clogged or damaged fuel pump - Test fuel pump and replace if necessary.
Vapor separator needle valve is damaged or worn - Install new needle valve.
Restricted fuel lines - Fuel lines must be clean.
Fuel tank air vent clogged or closed - Fuel tank air vent need to be opened or cleaned.
Plugged fuel filter - Fuel filter needs to be replaced.
Intake manifold air leaks - Replace intake manifold gasket.
Water intake is blocked - Need to wash or clean.
Throttle link and throttle valve are worn or damaged - Replace faulty components.
Damaged or clogged fuel injector - Clean or replace if necessary.
Engine is under excessive load - Load reducing required.
Fuel pump or fuel injector is clogged - Clean or replace if necessary.
Improper ignition timing - Adjust ignition timing as required.
Thermostat is faulty - Thermostat need to be replaced.
Water pump is defective - Install new water pump.
Improper propeller diameter or pitch - Install correct propeller.
Propeller bent or damaged - Have propeller repaired or replaced.
Outboard motor is mounted too high or too low - Position the engine correctly.
Low engine oil level - Add oil to the engine crankcase.
Defective oil pump - Install new oil pump.
Water intake screen is dirty - Wash or clean as required.
Wrong valve setting - Valves needs to be set correctly.
| Abnormal engine noise or knocking |
Stale fuel - Use proper gasoline.
Engine is under excessive load - Reduce load.
Low idle speed setting is incorrect - Correct idle adjustment.
Fuel pump is faulty or clogged - Test fuel pump and change if necessary.
Main bearings or crankshaft wear - Install new parts as as required.
Piston rings or cylinder bore are worn - Change defective components.
Dirt in the fuel lines - Clean fuel system lines.
Defective fuel injector - Test fuel injector and replace if necessary.
Fuel pump is dirty or defective - Service or replace fuel pump.
Ignition system failure - Check ignition and replace faulty components.
Cylinder head gasket is damaged - Replace the gasket as required.
Damaged powerhead parts - Replace defective parts.
Valves are stuck or burned - Service or replace valves.
Incorrect propeller selection - Replace propeller.
Propeller bent or damaged - Have propeller repaired or replaced.
Outboard engine mounting height improperly - Check the outboard motor mounting height.
Improper trim angle - Adjust trim angle.
| Engine uses too much fuel |
Clogged or worn fuel injector - Replace or clean if necessary.
Defective or loose spark plug - Spark plug need to be replaced or tightened.
Worn piston, rings, or sleeve - Replace defective components.
Electronic control unit is not operating - Replace ECU.
| Motor vibrates excessively |
Propeller bent or damaged - Have propeller repaired or replaced.
Propeller shaft damaged - Have propeller shaft replaced.
Weeds wraped around propeller - Remove and clean propeller.
Motor mounting bolt is loose - Tighten bolt.
Loose or faulty steering pivot Tighten correctly or replace.
Low battery voltage - Battery needs to be recharged.
Battery does not hold charge - Battery needs service or replacement.
Bad terminals or disconnected battery cables - Check wiring connections and replace or clean terminals.
Damaged starter motor - Repair or replace starter.
| Trim motor runs but trim system does not move up or down |
Lack of oil - Fill up oil.
Pump assembly faulty - Check pump and replace if necessary.
Manual shut-off valve leaks - Close the valve fully or replace it.
Faulty pump driveshaft or motor - Replace worn component.
| Trim cannot be fully up or down |
Damaged pump assembly - Change pump as required.
Tilt ram piston ball is displaced - Service or repair.
Damaged tilt ram piston O-ring - Change O-ring.
Not enough oil - Need to add the oil.
Lower check valve not seating in port side trim ram - Secure valve properly.
____________________________________________________________________________________
| Outboard Engines Technical Specifications |
| Small Engines Technical Specifications |
| Car Engines Technical Specifications |
| Industrial Engines Technical Specifications |
