Mercury 135 Black Max Problems
| Engine Model: Mercury Black Max 135 |
| Engine Type: 2-stroke 6-cylinder gasoline outboard engine |
| Total Displacement: 121.9 cu.in (2 L) |
| Rated Engine Power: 135 Hp (101 kW) at 5500 rpm |
| Fuel System: Two-barrel carburetor |
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| Engine difficult to start or doesn't start |
Gas tank is empty - Fill fuel up.
Wrong grade of gasoline - Change gasoline.
Fuel system clogged - Repair or replace.
Spark plug wire connection are damaged - Inspect the spark plug wire connection, replace or repair.
Spark plug is damaged - Change spark plug.
Clogged fuel filter - Install new filter.
Carburetor is not working properly - Inspect and adjust.
Clogged fuel lines - Service fuel lines.
Fuel tank air vent restricted or closed - Open or clean air vent.
Low fuel pump pressure - Replace or rebuild fuel pump.
Worn or defective reed valve - Replace reed valve.
| Engine starts but immediately shuts off |
Faulty spark plug - Replace spark plug.
Carburetor is clogged or defective - Clean or install new carburetor.
Damaged ignition coil - Replace ignition coil as necessary.
Closed or restricted fuel tank air vent - Fuel tank air vent need to be opened or cleaned.
Low fuel pump pressure - Repair or change fuel pump.
Ignition system failure - Test ignition and replace failed parts.
Dirty or faulty fuel pump - Check fuel pump and replace if necessary.
Wrong carburetor adjustment - Adjusting carburetor correctly.
Fuel lines are clogged - Clean fuel system lines.
Fuel tank air vent restricted or closed - Fuel tank air vent need to be opened or cleaned.
Dirty fuel filter - Replace fuel filter.
Gaskets are worn - Install new gaskets.
Excessive engine load - Reduce load.
Carburetor is running lean - Set the carburetor properly.
Incorrect ignition timing - Ignition timing needs to be set properly.
Thermostat is faulty - Install new thermostat.
Damaged water pump - Install new water pump.
Propeller selection improperly - Install correct propeller.
Damaged or bent propeller - Have propeller repaired or replaced.
Outboard motor is positioned too low or too high - Mount the motor as required.
Stale gasoline - Change fuel.
Engine overloaded - Reduce the load.
Wrong adjustment of low idle speed - Test and adjust.
Clogged or defective fuel pump - Check fuel pump and replace if necessary.
Main bearings or crankshaft failure - Worn parts replacement required.
Cylinder bore or piston rings are damaged - Change faulty components.
Carburetor is dirty or incorrectly adjusted - Carburetor needs to be adjusted correctly or cleaned.
Fuel pump is defective or dirty - Check fuel pump and replace if necessary.
Ignition failure - Inspect ignition system and change failed components.
Gaskets are defective - Change gaskets.
Damaged powerhead components - Change defective components.
Propeller pitch or diameter incorrect - Check the propeller size.
Damaged or improper size of propeller - Replace propeller.
Incorrect outboard motor mounting height - Check the outboard engine mounting height.
Incorrect trim angle - Make the correct trim angle adjustment.
| Excessive fuel consumption |
Carburetor main jet adjustment is incorrect - Adjust main jet as required.
Spark plug is loose or faulty - Spark plug need to be tightened or replaced.
Worn piston, rings, or sleeve - Replace defective parts.
| Excessive engine vibration |
Propeller bent or damaged - Have propeller repaired or replaced.
Damaged propeller shaft - Replace propeller shaft.
Weeds clogs the propeller - Remove weeds from propeller.
Engine mounting bolt is not tightened - Tighten the bolt as required.
Steering pivot is faulty or loose Tighten correctly or replace.
Low battery voltage - Recharge the battery.
Battery runs out quickly - Service charging system or replace battery.
Bad terminals or disconnected battery cables - Connect wires correctly or change terminals.
Damaged starter motor - Repair or replace starter.
| Trim motor is running but trim system cannot move up or down |
Oil level is insufficient - Check and refill oil.
Pump assembly is faulty - Test pump and change if necessary.
Manual shut-off valve leaks - Close the valve or change it.
Motor or pump driveshaft faulty - Replace worn component.
| Trim does not fully up or down |
Pump assembly faulty - Replace pump.
Tilt ram piston ball is not positioned correctly - Service or repair.
Tilt ram piston O-ring is worn - Install new O-ring.
Lack of oil - Checking oil level and add if necessary.
Lower check valve is not properly secured in port side trim ram - Install valve correctly.
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