Suzuki DF300BMD Troubleshooting
| Engine Model: Suzuki DF300BMD |
| Engine Type: 4-stroke 6-cylinder DOHC 24-valve gasoline outboard engine |
| Total Displacement: 268 cu.in (4.4 L) |
| Rated Engine Power: 300 Hp (220.7 kW) at 6000 rpm |
| Fuel System: Multi point sequential electronic fuel injection |
____________________________________________________________________________________
| Engine won't start or starts hard |
Empty gas tank - Add gasoline.
Improper fuel grade - Use correct gasoline grade.
Dirt and debris in fuel system - Remove debris and dirt.
Spark plug wire is loose or disconnected - Check spark plug wiring connection, repair or change.
Spark plug is defective - Install new spark plug.
Dirty fuel filter - Change fuel filter.
Damaged or wear vapor separator needle valve - Change vapor separator needle valve.
Fuel lines are clogged - Fuel lines must be clean.
Fuel tank air vent restricted or closed - Open or service air vent.
Defective fuel feed pump - Change or rebuild fuel feed pump.
Choke cable is worn or not adjusted properly - Change cable or adjust properly.
Valve clearance is wrong - Need to adjust valve clearance.
Valve timing is wrong - Set the valve timing correctly.
Low fuel pressure - Check system for fuel leaks or check low pressure fuel pump.
Dirty or faulty fuel injector - Clean or install new injector.
Fuel regulator failure - Replace fuel regulator.
Electronic control modul is not operating - Install new ECM.
| Engine starts but then shuts off |
Spark plug is faulty - Replace spark plug.
Vapor separator needle valve is bend or wear - Change vapor separator needle valve.
Ignition coil is defective - Install a new ignition coil.
Fuel tank air vent closed or restricted - Open or service air vent.
Faulty fuel pump - Install new fuel pump or rebuild it.
Damaged choke system - Inspect and replace choke system components.
Valve clearance is not correct - Need to adjust valve clearance.
Valve timing is wrong - Set the valve timing properly.
Valve springs are worn or loose - Valve springs need to be changed.
Valves sticking - Valves need to be cleaned.
Bad compression - Inspect and replace defective parts.
Clogged fuel filter - Fuel filter needs to be replaced.
Fuel injector is dirty or worn - Clean or install new injector.
Engine oil level low - Fill up the oil to required level.
Damaged oil pump - Change oil pump as required.
Water intake screen is dirty - Wash or clean as required.
Defective thermostat - Change thermostat as required.
Water pump malfunction - Water pump need to be replaced.
Ignition system problems - Inspect ignition system and change failed components.
Dirty or faulty fuel pump - Service or change fuel pump.
Damaged or wear vapor separator needle valve - Change vapor separator needle valve.
Dirty fuel lines - Clean fuel lines.
Fuel tank air vent restricted or closed - Open or service air vent.
Fuel filter is plugged - Fuel filter needs to be replaced.
Intake manifold air leaks - Change intake manifold gasket.
Water intake is clogged - Need to wash or clean.
Throttle valve and throttle link are defective or worn - Replace faulty components.
Dirty or faulty fuel injector - Replace or clean as required.
Engine is overloaded - Load reducing required.
Clogged fuel pump or fuel injector - Clean or replace if necessary.
Ignition timing is improper - Set the ignition timing properly.
Thermostat failure - Replace thermostat.
Water pump is defective - Change water pump as required.
Propeller selection improperly - Replace propeller.
Damaged or improper size of propeller - Have propeller repaired or replaced.
Outboard engine is positioned too low or too high - Mount the motor as required.
Not enough engine oil - Checking oil level and add if necessary.
Damaged oil pump - Change oil pump.
Water intake screen is dirty - Need to wash or clean.
Incorrect valve setting - Adjust valves as required.
| Abnormal engine knocking or noise |
Stale fuel - Use correct fuel.
Engine is running overloaded - Reduce the load.
Incorrect low idle setting - Correct the settings.
Fuel pump is faulty or clogged - Service or replace fuel pump.
Main bearings or crankshaft are worn out - Worn parts replacement required.
Cylinder bore or piston rings are worn - Change defective components.
Fuel lines clogging - Fuel lines must be clean.
Damaged fuel injector - Install new fuel injector.
Fuel pump is clogged or faulty - Clean or change fuel pump.
Ignition system problems - Check ignition and replace faulty components.
Cylinder head gasket is defective - Cylinder-head gasket replacement required.
Powerhead components are damaged - Change defective components.
Valves are burned or stuck - Replace or service valves.
Propeller pitch or diameter incorrect - Check the propeller size.
Damaged or improper size of propeller - Have propeller repaired or replaced.
Outboard motor mounting height is set incorrectly - Check the outboard engine mounting height.
Incorrect trim angle - Make the correct trim angle adjustment.
Fuel injector is clogged or malfunction - Replace or clean as required.
Loose or defective spark plug - Tighten or replace spark plug.
Rings, sleeve, or piston are damaged - Replace faulty parts.
ECU failure - Change electronic control unit.
| Engine vibrates excessively |
Damaged or bent propeller - Have propeller repaired or replaced.
Propeller shaft malfunction - Replace propeller shaft.
Weeds in the propeller - Remove and clean propeller.
Engine mounting bolt is not tightened - Tighten bolt.
Damaged or loose steering pivot Tighten correctly or replace.
Battery capacity is low - Low battery charging, charge as required.
Battery won’t hold charge - Battery needs service or replacement.
Disconnected wiring or bad battery terminals - Connect cables properly or replace terminals.
Starter motor is damaged - Starter needs to be changed.
| Trim motor is running but trim system cannot move up or down |
Oil insufficient - Need to add the oil.
Pump assembly is defective - Test pump and change if necessary.
Leakage of manual release valve - Close the valve fully or replace it.
Pump driveshaft or motor damaged - Replace defective component.
| Trim does not fully up or down |
Defective pump assembly - Replace pump.
Tilt ram piston ball is displaced - Service or repair.
Tilt ram piston O-ring damaged - Replace O-ring.
Low oil level - Need to add the oil.
Lower check valve is not properly secured in port side trim ram - Install valve correctly.
____________________________________________________________________________________
| Outboard Engines Technical Specifications |
| Small Engines Technical Specifications |
| Car Engines Technical Specifications |
| Industrial Engines Technical Specifications |
