Instructions on maintenance of outboard engines

A - the electricity system:
This is called the operating system because it transforms the magnetic field into electric field and then stores the electricity in special devices called ignition coils and then to the spark plug where the power goes out in form of a spark.

The electricity system consists of the following parts:
1 - DC spark System
2 – magnetic wheel
3 – coil ignition device

Maintenance of the electricity system:
this system shouldn't be exposed to dust and liquids, particularly, sea water. The wires should be kept clean and connections shouldn't be exposed to oil or anything may reduce or cut off of electric current.






B - Cooling system:
The importance of this system function lies in cooling the engine by drawing sea water by a pump passing
through designated pipes then push it into the engine parts, then get rid of it after cooling.

The cooling system consists of the following parts:
1. Water Pump
2. The water pipes
3. Thermostat (Thermostat)

Function and method of maintaining the cooling system parts

1- water pump:
It is located inside the engine lower cover, which is submerged in water. When the engine starts, the propelling shaft revolves, the pump starts drawing water and propelling it through the pipes into the engine parts.

Maintenance of water pump
You must make sure of the process of cooling the engine by watching water coming out naturally and make sure that the engine temperature is normal. Water inlet should be cleaned periodically; taking into consideration that the engine shouldn't be run out of water.

2 - Water passage pipes
The function of water passage pipes is transferring water from the sea to the pump and from the parts of the engine to outside.


Maintenance of water passage pipes
it must make sure that these pipes are not subjected to any thing leads to its obstruction, also to ensure the passage of the water inside them.

3- Thermostat
the function of thermostat is to regulate the entry of water as needed within the engine parts in case of increasing temperature.

Maintenance of thermostat
This device needs to be maintained on a regular basis along periods ranging from four to six months and maintenance is carried out by opening the device and clean it well with fresh water to remove residual salts deposited.

C - The fuel system
It is the most systems that must be preserved and consists of several parts, and requires accurate adjustment and maintenance to all its parts, because any defect or fault in one of its parts may cause the engine to stop.

The fuel system consists of the following Parts:
1. Fuel tank
2. Fuel pump Hose
3. Fuel filter
4. Fuel pump
5. Carburetor

1 - Fuel tank
it is the starting point for the fuel system where the fuel and oil are mixed at a ratio of 50:1 L (1 oil liter per 50 liters of fuel), knowing that the fuel tank capacity is (25 liters) so it needs to add 1/2 liter of the engine oil. Due to increase of temperature, it is preferred to increase the ratio of the oil to be 3/4 liter. In the case of the new engine, the ratio of oil to fuel should be 1:25 liters.

There is a filter in the fuel tank to maintain the cleanliness of the fuel. The tank prevents evaporation of the fuel and keeps it.
NOTE: The functionality of mixed fuel with oil is to reduce the rate of friction inside the engine, evaporation of fuel and the high temperature.

Maintenance of the fuel tank:
Fuel tank should be cleaned every four months through emptying of fuel and after making sure that it is empty of fuel, you open the meter fuel gauge, then clean the filter, meter and tank only.


2- Fuel pump hose
the function of the hose is to transfer fuel from the tank to the engine.

Maintenance of the fuel pump hose
you must ensure the safety of the hose and no leakage of fuel and make sure the proper connections of the hose. The connections should be not exposed to the sea water, taking in to consideration the direction of arrows on the Hose, from the tank to the engine.


3- Fuel filter
the fuel filter purifies the fuel before reaching to the pump.

Maintenance of Fuel Filter
Clean the filter thoroughly and regularly through opening of the filter and wash it well using gasoline.








4- Fuel Pump
The function is to pump fuel from the filter to the carburetor at the specific ratio.

Maintenance of the fuel pump
You must make sure that no leakage occurs from the fuel pump through the hose connections of from he pump itself. The pump must be fixed properly in its right place and be air-tight, otherwise it may lead to defect in the performance.

5- Carburetor

A - Mixing air with the fuel at the specific ratio before the combustion process.

B – It has the throttle valve that helps to speed up the process of running the engine when weather is cold and at the beginning of start up.

* In case of failure of the engine switch off key, the throttle valve can be used to stop the engine.


C - Control the speed.

Maintenance of the carburetor
Make sure to secure the carburetor cover tightly and that the fuel is free of dirt, sediments, and would prefer not to change its adjustment since it is complex, it should be check it by specialized technician when needed.

What should be done prior to sailing:
1. Make sure that the fuel was mixed with oil at the ratio as required (see the fuel system).
2. To ensure the safety of the fuel pump hose.
3. Make sure the cooling process immediately after start up (water comes out of the engine).
4. Ensure availability of a reserve fuel tank.
5. Make sure that all electric connections are properly connected.
6. Make sure that the spark plug is working properly for combustion.
7. Ensure that no leakage of the gear oil.
8. Make sure that there are two reserve spark plugs.
9. Make sure that your transmission (gear) in good condition and also make sure that the propeller spins properly when moving the transmission.
10. There following should be available:
a. spark plug socket driver
b. screwdriver
c. Socket screwdriver, size 10 and 12 mm.

11. Availability of a second engine in the boat is necessary to avoid risks in the event of the engine failure during a trip sailing.

What should be done upon return from sea

A – Disconnect the fuel pump hose from the engine and keep the fuel tank away from moisture and sea water and then clean the engine with fresh water to remove salt and others, and cover the engine.
B – In case of not running the engine for a period of time more than a month, the following should be taken into consideration:

1. Start the engine in fresh water for five minutes.
2. Draining the engine of the water completely.
3. Open spark plugs and put some oil in the engine cylinders, preferably pulling the starting up line for several times so the oil is distributed in all parts of the engine and then put the spark plugs again.
4. Lubricating the moving parts of the engine.
5. Keeping the engine away from dust and water.