The motor boat engine has certain features. In accordance with them, manufacturers develop lubricants. Oil needs to be changed in the engine periodically. The correctness of its choice depends on the duration of the device.
Many varieties of specialty lubricants are on sale. How to choose the right oil for the gearbox of the outboard motor, expert advice will help to figure out. The main selection criteria should know every owner of such a technique.
Features of outboard motor
Outboard motors Yamaha , Mercury, Tohatsu and other manufacturers are distinguished by certain design features. The user who is faced with the need to carry out maintenance of such equipment for the first time should carefully study all the nuances of this process.
First of all, it should be noted that it is forbidden to fill automobile oil in such equipment. The fact is that a small amount of water can get into the gearbox. While the motor is new, this does not happen. However, when rubber glands and gaskets are worn, this situation is not excluded. Automobile oil, mixed with water, will turn into an emulsion. In this case, the elements of the mechanism are rapidly destroyed. Soon you will need to change the engine.
Special boat oils for the transmission include a specific set of additives. They prevent the formation of emulsions, prevent the occurrence of corrosion. Therefore, only special lubricants should be used for the boat engine.
Why change the oil?
In the process of its work, the moving elements of the engine can be destroyed due to friction. To prevent this from happening, special lubricants are used. Oil for the gearbox of an outboard motor is able to reduce heating and friction of moving elements, prolonging the life of the engine.
The composition of such funds includes a certain set of additives. They enhance the effect of the lubricant, preventing corrosion, washing away contaminants and keeping them in suspension. Additives lose their protective ability over time. Pollution, carbon deposits begin to accumulate in the oil. If you do not replace the grease in time, they will settle on the surfaces of the parts. It will be difficult for the motor to work. Particles of dirt will destroy the elements of the mechanism. Also, if water gets inside the transmission, rust will form. To prevent this from happening, you should change the oil on time.
Specifications
When considering which oil to pour into the gearbox of a boat engine , it is necessary to consider such an important indicator as viscosity. It is customary to classify it in accordance with the SAE standard. Most engines require an 80W-90 class grease reducer. For stationary types of motors, it is necessary to purchase oil with a viscosity index of 85W-90.
This standard is not the only criterion for choosing lubricants for a motor. Many manufacturers label their products according to the API system. She identifies two viscosity grades for motor boat engines. GL-4 class oil is used for servicing hypoid, bevel gears. They have a slight displacement of the axes during movement. Such motors can operate in different conditions. Usually they alternate. After a heavy load, the motor requires a reduction in speed.
GL-5 gear oil for gearboxes is used for loaded hypoid gears. They present a significant displacement of the axes during movement. To ensure the normal operation of the engine even in difficult conditions, such materials contain more additives than the means of the previous class.
Original or equivalent?
When choosing which oil to pour into the gearbox of an outboard motor , users may encounter a large number of different lubricant products. Its cost differs depending on the manufacturer. To make the right choice, first of all you need to read the instructions of the equipment manufacturer.
The manual must indicate which oils are allowed to be used for a particular motor. In the production of such equipment, tests are carried out. Not all lubricant manufacturers provide suitable product specifications.
When running a new engine, it is imperative to use a special oil, which is allowed to be used by the engine manufacturer. This tool is more expensive than analogues, but its technical characteristics will help preserve the integrity of all motor parts, even with significant overloads. Analogs can be applied after a certain period of operation of the engine. However, their technical characteristics must fully comply with the requirements of the manufacturer.
Engine "Yamaha", "Tohatsu"
Yamaha motors have hypoid gears. The manufacturer of the equipment presented has developed a special line of tools that are suitable for such engines. It is called Gear Oil. For all of its motors, the manufacturer recommends purchasing products with a viscosity class GL-4.
Similar lubricants were tested under different conditions when developing Yamaha engines. Their quality and compliance with the high technical requirements of the manufacturer confirms Yamaha Marine. The oil film that forms on the moving elements effectively prevents the appearance of rust, the formation of an emulsion. It is resistant to high temperatures. The oil has good cleaning properties.
The Tohatsu company does not provide for the use of a particular brand of lubricants for its equipment. The oil producer can be anything. However, lubricant specifications must comply with GL-5.
Engine Mercury
When choosing oil in the gearbox of the Mercury outboard motor , it is extremely important to familiarize yourself with the manufacturer's recommendations. This company plans to use Quicksilver lubricants for its engines. It includes several varieties of gear oils.
One of the most popular varieties is the Premium Series. It is used for gear motors with a capacity of 75 liters. from. Moreover, this oil is allowed to be used for boat engines of other manufacturers. This is a high-quality, high-tech tool.
For outboard engines with a capacity of more than 75 liters. pp., as well as stationary engines of the MerCruiser class, the manufacturer created High Performance grease. It is also noted that mixing oils of different series is prohibited. If initially a certain class of agent was used in the engine, it is not recommended to change it. The composition of such tools includes various additive packages that may conflict with each other.
The amount of oil in the engine
To determine how much oil to fill the outboard motor gearbox , you need to look at the manufacturer's instructions. It provides detailed information about engine capacity. The motor gearbox increases in proportion to its power. However, this may differ from one manufacturer to another.
To determine how much oil you need to purchase for maintenance of the equipment, you need to consider the average capacity indicators of the equipment presented.
If the motor has a power of up to 6 liters. with., you need to add about 200 ml of oil. With an increase in this indicator to 18 liters. s., you need to buy more than 370 ml of lubricant. Motor reducer up to 30 l. from. will require about 450 ml of the drug, and over 70 liters. from. - 900 ml. This characteristic must be recognized in the engine operating instructions.
Oil level check
The oil for the outboard motor gearbox must be controlled in accordance with the manufacturer's recommendations. Depending on the frequency of operation of the boat, as well as the load of equipment.
To check the amount of grease in the gearbox, a specific procedure must be followed. First, the engine must be placed vertically on the transom (if the boat is standing on the shore of a reservoir) or on a special stand. At the top left of the gearbox there is a control hole.
Next, the cork is unscrewed. Insert the probe into the hole on the gearbox. To do this, even a regular toothpick or match is suitable. After removing the probe, its condition is evaluated. If it is dry, add oil.
Oil Change Preparation
Considering how to change the oil in the gearbox of an outboard motor , you need to pay attention to the preparation for this process. All necessary materials, tools should be at hand. The used oil will need to be drained into a basin or other container. The volume of this cookware must be selected in accordance with the volume of the gearbox.
It is also necessary to prepare a slotted screwdriver, new rubber gaskets for plugs. In the process, you will need a special pump if the engine has more power and capacity. It will allow you to pump oil inside. For small motors, grease is poured in through the nozzle. You should also prepare the required amount of new oil.
Change of oil
After installing the motor on a stand, a basin is placed under it. At the bottom of the engine there is a plug that needs to be unscrewed. Mining is merging. The top plug is also loosened. Old grease will drain into the tank for about 10 minutes. At this time, you need to change the seals. Do not flush the gearbox with gasoline. It will damage rubber pads and water will get inside.
The nozzle of the tube with grease (if the motor is small) or the pump nozzle is inserted into the lower hole. Gradually, pour oil inside. It should appear from the top inspection hole. While holding the tube or pump, tighten the top plug.
Then quickly you need to close the bottom hole. A small amount of grease will still leak out, but it's not scary. After that, the oil level is checked in the upper inspection hole. If it is insufficient, add lubricant. The gearbox is wiped, and the mining is transferred to a special collection point for processing.
Having considered what constitutes oil for the outboard motor gearbox, you can independently select and replace it.