How to properly transport a four-stroke outboard motor

The question of how to properly transport an outboard motor, especially a four-stroke one, arises for every boat owner after completing navigation or at the end of fishing. Unlike the more simple two-stroke ones, four-stroke units have a complex crankcase design where oil is permanently located, which imposes strict restrictions on position when moving. Improper stowage can lead to lubrication leaking into the combustion chamber, clogging candles and, as a result, costly repairs.

Many newcomers mistakenly believe that there is no difference, and simply throw the equipment in the back of the truck or on the trunk of a passenger car. gravity The oil from the crankcase through the sapuna channels or through piston rings can penetrate the cylinder, creating a water shutter or simply contaminating the system. So compliance with the rules of transportation is not just a whim of the instructions, but a necessity for extending the life of the system. combustion engine.

In this article, we will take a detailed look at all the preparation steps, select the optimal position for different models and discuss how to securely lock. You will learn why it is important to close the exhaust hole and how to protect the unit from headwinds and road dust. The right approach to the logistics of your equipment will save you from unpleasant surprises on the water next season.

Why four-stroke motors require a special approach

The main design difference of the four-stroke is that it has a separate lubrication system for the crankcase. Whereas in two-stroke engines, the oil is mixed with the gasoline and burns, here it circulates in a closed circuit. When it is tilted or turned over, the oil flows under gravity to parts of the engine where it should not be static. silencer and the intake manifold.

If the motor is placed on a side that does not meet the manufacturer's recommendations, oil can leak into the cylinder through the valve mechanism. When started after such transportation, the liquid does not compress, which can lead to deformation of the rod or break the piston group. In addition, leakage of oil through the sapoon leads to its loss and pollution, which is especially critical when transported on the roof of the car.

It's important to remember that different manufacturers design their engines differently. Yamaha or Tohatsu There are special valves that allow transportation on any board, but this is the exception rather than the rule, and most Chinese and European brands require strict compliance with orientation in space. warranty.

⚠️ Warning: Never leave the motor in an inclined position for long periods of time, even if the instructions permit it. Short-term transportation and long-term storage are different processes with different risks for the oil seals and seals.

Understanding the physics of the engine helps to avoid fatal errors. The oil has a certain viscosity, but when heated or exposed for a long time it becomes more fluid, so even if the engine is cold, the risk of lubrication flowing through the crankcase ventilation system remains high with the wrong angle of inclination. Tightness The system is not absolute, it is designed for working angles of roll, and not for lying on the side.

Preparation of the motor for transportation

Before you think about how to put the unit, you have to do a series of preparatory operations, and the first thing you have to do is disconnect the fuel hose and let the residues of gasoline in the carburetor or fuel ramp burn out until the engine stalls, and this will prevent fuel leakage and fire hazards, and then thoroughly wash the lower unit with fresh water to wash away the salt and dirt that can cause it. corrosion during storage or travel.

Special attention should be paid to the protection of external components. The air intake and exhaust hole should be closed. This can be done by using special plugs that come with a kit, or improvised means, such as dense rags or plastic bag fixed with tape. This is necessary so that road dust, insects or moisture does not get inside the exhaust system. The moisture inside the exhaust system when cooled can cause corrosion from the inside, and the dust will clog up. carburetor Or an air filter.

If you want to secure the motor on the transom or in the drawer, you should use a transport bracket. If you lose it, you can make a temporary strut. The main thing is to fix the lower unit so that it doesn't hang around and put a load on the crank. Also, remember to remove the screw if you plan a long trip over rough terrain so that the vibrations don't damage the oval.

• 🛑 Be sure to shut down the fuel faucet and disconnect the hose.
• 💧 Wash the outside of the lower unit with fresh water after use in salt water.
• 🧣 Close the muffler and air filter from dust and moisture.
• 🔧 Lock the lower unit in an upright position or on the transport bracket.

Optimal position during transport

The safest and most recommended option for all manufacturers is the vertical position, in which case the oil stays in the crankcase, in the oil pump area, and does not leak into the cylinder. However, this is often impossible to implement in a car or a small PVC boat due to the dimensions, so most owners are forced to look for compromise options for stacking.

If vertical transportation is not possible, you can put the motor on its side. But which one? That's the key secret. You have to put it on the side where the exhaust system is, or the other side, but only if the design requires it. instruction This indicates that the motor is placed on the right side (when you look at the back at the lower unit), because there are often valves on this side, and the oil drains into the safe zone of the crankcase without getting into the combustion chamber. Mercury or Suzuki The rules may differ.

It is strictly forbidden to put a four-stroke motor on the left side (from the thrust-rumble side and the carburetor / injector) without first draining the oil. In this position, the oil is guaranteed to pour the cylinder through the valves. If you do not know exactly which side you can put your model, it is better not to risk and transport only vertically or use a special box with a fixation at an angle if it is provided by the design.

Can I drive the engine on the roof of the car?

Yes, you can, but only in a special kofra or securely fixed on the transom of the boat. When transporting on the roof without a boat, be sure to remove the motor from the transom and put it in a horizontal position in the trunk or body, as wind load on a vertical motor at speed can break the lower unit or fasteners.

Table of allowable provisions for different brands

Other manufacturers approach engine layout differently. Below is a summary table that will help you navigate the basic requirements of popular brands. Remember that specifications can vary from model to model, so always check with the manual of a particular device.

Brand	Vertically.	Right aboard.	On port.
Yamaha (mostly)	Permitted.	Permitted.	Forbidden.
Tohatsu / Nissan	Permitted.	Permitted.	Prohibited (without oil drain)
Honda	Permitted.	Permitted (with restrictions)	Forbidden.
Suzuki	Permitted.	Permitted.	Forbidden.
Mercury	Permitted.	Clarify in manual	Often forbidden.

And you can see from the table that the left side is almost always a taboo for four-strokes, and that's because of the valve cover and the oil crankcase, and if you put the engine on the wrong side, you'll get thick white smoke from the silencer the first time you start, and that burns the oil that gets into the cylinder. And although a single run might not kill the engine right away, a regular repetition of that error will cause the rings to get out and then you'll get out. piston-group out of order.

Reliable fixation and protection from the external environment

The right position is only half the battle. The motor needs to be securely secured. When you move a car, especially on rough roads, there are strong vibrations and jerks. If the engine is just lying in the back, it can shift, hit the side or other objects, damaging the body. pulpUse strong rattle-tight straps to attach the motor to the lower unit and the transom attachment, but not to press the plastic elements.

The oncoming airflow at high speeds carries fine dust, sand and rocks. When it gets into the cooling system or into the hot parts of the engine, abrasive particles can cause wear. So using a protective cover or awning is mandatory. The cover will also protect against rain, which, when the engine cools, can be sucked in through the sapons, creating an emulsion with oil.

When you're in a trunk or trailer, it's important to consider sailing. The motor has a significant surface area, and in lateral winds, it works like a sail, putting a strain on the mounting points. Make sure the boat with the engine is fixed rigidly, without backlashes. Additional insurance with a cable or chain will never be superfluous.

• 🌪️ Use a tight protective cover to exclude dust and moisture.
• 🔗 Use only serviceable tie straps with a margin of safety.
• 🚗 Move without sharp jerks and braking, especially on corners.
• 🔍 After arrival, be sure to inspect the engine for damage and leakage.

⚠️ Warning: Do not use thin ropes or wire to fasten the motor; they may be rubbed or stretched by vibration, causing the heavy unit to fall on the move, creating an emergency situation on the road.

Actions after transport

Once you have the motor delivered to your destination, don't rush to start it right away. If the motor is on its side, it needs to be given time to get the oil glass back into the crankcase. The optimal waiting time is at least 15-20 minutes upright, which will restore the normal level of lubrication in the system and avoid oil starvation at start.

Before starting, inspect the spark plugs. If you violate the transportation rules and the oil hits the cylinder, the candles can be filled. In this case, they must be twisted, wiped and dried, and also several times to pull the starter without candles to blow the cylinders from excess oil. Trying to start the engine with the flooded candles can lead to their damage or problems with the engine. ignition.

Also check the oil level in the crankcase. Even if properly transported, there may be micro-leaks through the sapoon. The chip should show the level between the tags. If the oil is less, add it to normal. Ignoring low oil levels when working under load will lead to bullies and engine wedges.

These simple but important rules will keep your four-stroke engine in perfect condition for years to come, and remember that repairing these engines is difficult and expensive, and prevention takes only a few minutes of your time before you travel.

What happens if I put the engine on the forbidden side?

There is a high probability that oil will flood the cylinder. When you start the engine will be very smokey, may not start the first time (the shutter). If the oil gets into the muffler, the smoke will last long. In the worst case, there will be a piston hit on the oil, which can bend the rod. A single violation can go without consequences, but the risk of expensive repairs is too great.

Do I need to drain oil from a four-stroke engine before shipping?

No, it is unnecessary and harmful to drain oil from the crankcase before each trip. Modern motors are designed to be transported in a certain position with oil inside. Oil drain is only required during prolonged storage, repair or if you have to drive the engine in a different position than recommended (for example, only on the left side), and the design does not allow otherwise.

Can I carry the motor on the transom of a boat attached to the car?

Yes, this is the most common way. The boat should be securely attached to the trailer, and the engine is raised to the transport position and fixed by the slope limiter. Be sure to make sure that the lower unit does not touch the ground when driving on irregularities. For long trips on the highway, it is better to remove the engine and remove it into the cabin or body to reduce wind load and vibration.