Mercury Force 40 Troubleshooting
| Engine Model: Mercury Force 40 |
| Engine Type: 2-stroke 3-cylinder gasoline outboard engine |
| Total Displacement: 60 cu.in (0.98 L) |
| Rated Engine Power: 40 Hp (29.5 kW) at 5500 rpm |
| Fuel System: Dual side-draft carburetors |
____________________________________________________________________________________
| Engine doesn't start or hard to start |
No gasoline in tank - Add fuel.
Wrong grade of gasoline - Use correct gasoline grade.
Dirt and debris in fuel system - Remove debris and dirt.
Loose or disconnected spark plug wire - Check spark plug wiring connection, repair or change.
Faulty spark plug - Change spark plug.
Dirty fuel filter - Replace or clean fuel filter.
Carburetor is not working properly - Inspect and adjust.
Dirty fuel lines - Fuel lines must be clean.
Closed or clogged fuel tank air vent - Open or clean air vent.
Low fuel pump pressure - Replace or rebuild fuel pump.
Damaged or worn fuel reed valve - Install new reed valve.
| Engine starts and stops immediately |
Defective spark plug - Spark plug need to be replaced.
Clogged or faulty carburetor - Service or replace carburetor.
Defective ignition coil - Change ignition coil as required.
Fuel tank air vent restricted or closed - Open or clean air vent.
Lack of fuel pump pressure - Install new pump or repair it.
Defective ignition - Test ignition and replace failed parts.
Clogged or defective fuel pump - Test fuel pump and replace if necessary.
Carburetor components worn out - Repair or replace parts.
Fuel lines clogging - Fuel lines must be clean.
Closed or clogged fuel tank air vent - Open or service air vent.
Fuel filter is clogged - Install new filter.
Gaskets are damaged - Install new gaskets.
Engine overload - Reduce load.
Carburetor fuel mixture is too lean - Make the correct settings.
Bad ignition timing - Adjust ignition timing as required.
Defective thermostat - Replace thermostat.
Damaged water pump - Change water pump as required.
Propeller pitch or diameter incorrect - Check the propeller size.
Damaged or bent propeller - Replace propeller.
Outboard motor is mounted too high or too low - Position the engine correctly.
Stale fuel - Change fuel.
Engine overload - Load reducing required.
Too low idle RPM - Correct idle adjustment.
Fuel pump is defective or dirty - Clean or install new fuel pump.
Crankshaft or main bearings wear - Install new parts as as required.
Cylinder bore or piston rings are worn - Change defective parts.
Carburetor is clogged or incorrectly adjusted - Clean or properly adjust carburetor.
Fuel pump is defective or dirty - Clean or replace fuel pump.
Ignition failure - Inspect ignition system and change faulty parts.
Gaskets are worn - Change gaskets.
Damaged powerhead components - Replace defective parts as required.
Propeller pitch or diameter incorrect - Install correct propeller.
Damaged or bent propeller - Replace propeller.
Outboard engine mounting height improperly - Have motor adjusted to proper transom height.
Incorrect trim angle - Adjust trim angle.
| Engine using too much gasoline |
Carburetor main jet adjustment is incorrect - Adjust it properly.
Faulty or loose spark plug - Spark plug need to be replaced or tightened.
Piston, sleeve, or rings are damaged - Replace defective components as required.
| Engine vibrates excessively |
Damaged or improper size of propeller - Replace propeller.
Damaged propeller shaft - Propeller shaft needs to be replaced.
Weeds clogs the propeller - Remove weeds from propeller.
Engine mounting bolt is not tightened - Tighten bolt.
Steering pivot is faulty or loose Tighten correctly or replace.
Battery capacity is low - Charge the battery.
Battery is draining quickly - Service or replace the battery.
Faulty battery terminals or disconnected cables - Check wiring connections and replace or clean terminals.
Starter motor failing - Starter needs to be changed.
| Trim motor is running but trim system cannot move up or down |
Oil level is insufficient - Checking oil level and add if necessary.
Defective pump assembly - Test pump and change if necessary.
Manual shut-off valve leaks - Close the valve or change it.
Broken motor or pump driveshaft - Replace worn component.
| Trim cannot be fully up or down |
Damaged pump assembly - Change pump as required.
Tilt ram piston ball is in wrong position - Service or repair.
Tilt ram piston O-ring is worn - Change O-ring.
Oil insufficient - Checking oil level and add if necessary.
Lower check valve not seating in port side trim ram - Install valve correctly.
____________________________________________________________________________________
| Outboard Engines Technical Specifications |
| Small Engines Technical Specifications |
| Car Engines Technical Specifications |
| Industrial Engines Technical Specifications |
