With the onset of navigation, each water motor is faced with the question of not only choosing a route, but also safely delivering equipment to the water. four-strokeThe design is radically different from the simpler two-stroke counterparts, and owners often underestimate the risks associated with the wrong position of the unit in the trunk, which can lead to serious breakdowns before the first start.
The four-stroke power plant has a full-fledged oil crankcase, a GRM valve system and a complex exhaust design, which makes it extremely sensitive to angles of inclination. If a two-stroke can be carried in almost any position, as long as it does not flow, then there are strict restrictions. Ignoring the rules. transportation It is fraught with oil entering the combustion chamber, damage to gaskets or even the destruction of internal mechanisms.
In this article, we will take a look at the algorithms for car owners who want to deliver their motors safely, how to prepare their vehicles, what angles of inclination are acceptable for different models, and how to avoid common mistakes. Proper preparation will take no more than 15 minutes, but save you money on expensive repairs.
Features of the design of a four-stroke engine during transportation
The main difference between a four-stroke engine is that it has a closed lubrication system where the oil is in the crankcase pallet, and if you change the position of the case abruptly or tilt the oil can flow to the nodes where it should not be, at best it will lead to oil starvation of crankshaft bearings, at worst to a hydraulic shock when you try to start.
Also, the location should be taken into account. gas-distributionIn some models, especially with the upper camshaft arrangement, the slope can disrupt the circulation of oil to the cylinder head. carburetor The fuel ramp or float chamber must remain in the working position so as not to pour candles or create an air traffic jam.
It's important to understand that manufacturers often specify permissible angles of inclination in the instructions for the operation of a particular model, but in practice this data is not always obvious or easily available at the time of loading, so there is a golden rule: the closer the position of the motor to the vertical, the less risk to its internal components.
Why can't you carry a four-stroke on your side?
During long-term side-carriage, the oil from the crankcase is guaranteed to flow into the cylinders through piston rings, and when launched, the incompressible liquid will cause a hydraulic shock that can bend the rods or penetrate the cylinder block.
Preparation of the engine for loading into the car
Before lifting a heavy unit, a number of mandatory procedures must be carried out. disconnect And let the residues of gasoline drain into the prepared tank, and that will prevent the fire from happening, and it will eliminate the fuel odor in the car, so if you use a takeaway tank, you better secure it separately or seal it.
Then you need to drain the cooling system if the motor was operated in salt water or just to avoid corrosion during storage. transom-holding - screws should be tightened so that lower unit does not dangle when shaking.
☑️ Preparation of the engine for the trip
Pay special attention to protection from dirt and dust. Going to a pond, you carry a clean mechanism, but the return path can be dirty. transporter This is especially true if you're planning to drive in a passenger car, where clean upholstery is important.
Permissible inclination angles and position in space
The question of how far you can tilt a four-stroke motor is the most critical one. Yamaha, Tohatsu or HondaBut for long-term transport in the car, the situation is different. The angle allowed often depends on the design of the particular model and the location of the oil intake.
There's a misconception that if the engine is on the right side (on the exhaust side), it's safe. This is only partly true, and only for short-term movements. If you're shaking on the road for a long time, the oil will still migrate. lower unit Directed strictly downwards, and the head of the motor is on top.
| Motor position | Permissibility for 4T | Risks. | Recommended time |
|---|---|---|---|
| Vertically. | Perfect. | Absent. | No restrictions. |
| 15-30 degree inclination | Permissible. | Minimum | 1-2 hours. |
| Inclination 45 degrees | Critically. | Oil throwing into cylinders | Installation/removal only |
| Horizontal (lying) | Forbidden. | Hydro-impact, HRM breakdown | 0 minutes. |
If your car doesn't allow you to drive vertically, try to minimize the angle of inclination. Use stops, wedges or special racks to lock the unit as close to the vertical position as possible. The critical threshold for most four-stroke motors is considered to be a slope of more than 45 degrees.After which the active flow of technical fluids begins.
Transportation in the cabin of a passenger car
Owners of small crossovers and hatchbacks often have to load equipment inside the cabin, which is only permissible for low- and medium-power engines (up to 15-20 hp), which can be lifted by one or two people, the main condition is to ensure a stable vertical or close to it position.
Use the fasteners in the car to fix it, seat belts, special hooks in the trunk or even a stop in the floor will help to keep it in place. lower unit Be sure to put a dense cloth, cardboard or rubber mat under the bottom of the lower unit so as not to damage the cabin skin and the engine itself.
If you have to put the motor, which is very undesirable, follow the rule of "head up." The head of the motor (cylinder block) should be above the lower unit. In some cases, it helps to remove the rummel or rotary handle of gas, which allows you to change the center of gravity and lay the unit more compactly, but with the preservation of the angle.
⚠️ Warning: Never leave the engine unattended in hot weather, gasoline vapors, even in small amounts, in an enclosed space create an explosive mixture, and sunburn can damage plastic controls.
Transportation in the back of a pickup truck or on a trailer
Having a pickup truck or boat trailer makes it much easier to drive the engine upright, but it's where the laws of aerodynamics come in. At speed, the flow of oncoming air creates tremendous pressure that can tear down a poorly secured unit or damage its plastic casings.
Use specialised motor racks that are attached to the sides of the body or the frame of the trailer, which allow you to lock the lower unit and firmly hold the leg of the motor. If you don't have one, you can fasten the motor directly to the trunk of the boat, but only if the boat is safely moored and has a rigid structure that does not break under the weight of the engine.
Be sure to use a windscreen cover or a tight awning. The counter flow of air at 60-80 km / h carries dust, small stones and insects that can damage the paintwork and get inside the cooling system or carburetor through drainage holes.
Use soft screed straps with a ratchet mechanism to lock the motor. Metal chains can damage plastic lower unit, and conventional ropes tend to stretch and weaken in vibration.
Fixing and protection against vibrations in transit
Road vibration is the invisible enemy of technology. Constant shaking can lead to spontaneous spinning of screws, weakening of clamps and even cracks in plastic. So high-quality fixation is not just a requirement of traffic, but also a necessity for safety. boat-engine.
Check the tightening of all visible bolts before you travel, pay special attention to the place where the motor is attached to the transom or rack, use additional gaskets made of rubber or foamed material at the points of contact of metal with metal to extinguish the vibration.
If you are carrying the motor assembled with the boat, make sure that lower unit does not rest on the side or bottom of the boat when rolling. When driving on rough roads, the boat can "walk" on the trailer, and hard contact can split the lower unit or damage the screw.
High-quality fixation of the motor prevents not only its fall, but also microvibrations that destroy threaded joints and plastic structural elements during a long trip.
Actions after arrival and before launch
Once you have delivered the motor to the water and set it on a tray, do not immediately pull the starter. If the transportation was tilted, let the oil flow back into the crankcase. It is enough to hold the engine in an upright position for 10-15 minutes before starting.
Visually inspect the unit for fuel or oil leaks that may have appeared in transit, check if water has entered the exhaust hole (if you have crossed water barriers or washed the engine), make sure that all fasteners are in place and tightened after vibration in the road.
Starting after transportation is better done at idle speed, listening carefully to the engine, foreign knock or smoky exhaust may indicate that oil enters the cylinders, in which case you need to let the engine warm up so that the excess oil burns out, but monitor the temperature.
Can a four-stroke motor be carried horizontally?
The horizontal position ensures oil leaks into the combustion chamber and valve mechanism, which can lead to a hydraulic shock at start-up, which will require major engine repairs.
Do I need to drain the oil before a long journey?
In most cases, this is not required if you follow the angle of inclination. However, if you plan a very long transportation in a difficult position, some manuals allow the oil to drain. Be sure to consult the instructions for your model, as the procedure for changing the oil has its nuances.
How to protect lower unit from stones on the track?
Use a special vehicle case for the motor, and if you don't have one, you can carefully wrap lower unit in a dense cloth or cardboard and lock it with tape, leaving access to the mounting holes, which will save you from chipping paint and mechanical damage.
What if the engine falls on the way?
Don't start the engine right away. Carefully inspect the lower unit for dents, check the integrity of the lower unit pipe and water pump. If you suspect a screw or a lower unit impact, you'd better contact the service for a diagnostic before operation.