Modern diagnostics of motor and outboard motors has ceased to be the lot of only professional services with expensive equipment. Today, any enthusiast or owner of water equipment can buy a compact car. videoendoscope It's a device that allows you to visually view hard-to-reach places, such as cylinder interiors, intake manifolds or cooling systems, and it allows you to see the state of the piston group without the time-consuming dismantling of the cylinder head, which saves you a lot of time and money. It's especially important for outboard motor owners, where access to the units is often limited by design features.
The main task that is being solved boroscopeIt's identifying critical defects early on, and you can detect bullies on the cylinder mirror, assess the level of soot on the bottom of the piston, or check the valve integrity by simply twisting the spark plug. The camera resolution must be at least 720p to distinguish between microscopic cracks and risks. Without a high-quality image, the diagnosis turns into fortune-telling, and an erroneous diagnosis can lead to major repairs of the engine.
The market offers many models, varying in connection type, probe length and camera diameter. For motorists and boaters, the most important parameters are the flexibility of the probe and its protection from oils and fuel. The wrong choice of tool can lead not only to waste money, but also to damage the engine itself if the camera gets stuck or damaged inside. In this article, we will discuss in detail how to choose the optimal device, conduct an inspection and correctly interpret what we see.
The principle of operation and Construction of the technical endoscope
A technical endoscope, or boroscope, is a flexible tube with a miniature backlit camera at the end of it, and LEDs around the lens illuminate the dark space inside the cylinder, transmitting the image to a smartphone, tablet or device's built-in monitor. Optical system Modern gadgets allow you to focus on objects located at a distance of 2 to 10 centimeters from the end of the camera, which is ideal for examining the walls of the cylinder.
A flexible probe is usually enclosed in a fiberglass braid or metal corrugated. Metal braid is more durable and holds shape better, but may be less flexible in tight places. Glass fiber is great at conveying the image, but requires careful handling, because when bending strongly, the fibers can burst, creating "dead zones" in the picture. oil-resistance material braiding, as contact with the remains of motor oil is inevitable.
⚠️ Attention: Never push the camera into the cylinder with force. If the probe encounters resistance, change the angle of rotation. Forced advance can cause the camera to get stuck between the piston and the cylinder wall, which will require disassembling the engine to extract.
There are two main types of signal transmission: analog and digital. Digital models transmit data directly via USB or Wi-Fi, providing a clearer picture without interference. Analog systems, although less common, can be useful in conditions of strong electromagnetic tips, but for amateur diagnostics of cylinders. interface It is a preferred choice because of the ease of working with the image.
Criteria for choosing a camera for diagnosing ICE
When choosing a device for inspection of cylinders, you need to pay attention to a number of technical specifications that directly affect the quality of diagnosis. The first and most important parameter is the diameter of the camera. 5.5 mm before 8 mmThinner cameras may not give you the right view, and thick ones simply won’t fit into the standard candle hole.
Cable length is also important, and for most four-stroke motors and motorcycle engines, a sufficient length of the cable is required. 1-2 metersHowever, for inline engines with deep candle wells or V-shaped configurations where access can be difficult, it is better to have a margin of length. The cable should be stiff enough to be guided, but also flexible enough to bypass obstacles.
The third key is that the camera will work in an aggressive environment: gasoline vapor, oil, possible moisture. IP67 If the device is not certified for moisture and dust protection, the risk of failure after the first use in the engine is extremely high, and heat resistance is also important, although in a cold engine this is less critical.
- 🔍 Resolution of the matrix: Minimum 1 MP (1280×720), preferably 2 MP for a detailed examination of the risks.
- 💡 Adjustment of the illumination: The ability to change the brightness of the LEDs to avoid glare from the oil film.
- 📱 Software compatibility: Support for Android and iOS, the presence of functions of recording and photofixing defects.
- 🔄 Frequency of frames: At least 30 FPS for smoothly moving the camera inside the cylinder.
Preparation of engine and equipment for inspection
Before you start a diagnostic, you need to get the engine right, and it's best to do it on a warm engine that's cooled to a safe temperature, or on a completely cold engine. You can unscrew all the spark plugs. This will give you the best air circulation to dry the cylinders and allow you to enter the camera through the maximum possible hole. If the candles are twisted tightly, use the collar and head to keep the threads from breaking.
Make sure to blow candle wells with compressed air before removing the candles so that dust and dirt don't get inside the cylinder. Any abrasive particle caught between the piston and the wall can leave the bullies you're trying to find. After removing the candles, gently wipe the area around the holes with clean rags.
☑️ Checklist of preparation for diagnosis
Check the endoscope before you enter the engine. Turn on the backlight and make sure that the image is clearly transmitted, without ripples. Wipe the camera lens with a soft cloth that leaves no pile. If the lens is fingerprinted, when the light is bright, they will create a light that prevents you from seeing details. For ease of operation, lock the phone or tablet in the holder so that you have both hands free to control the probe.
⚠️ Attention: It is strictly forbidden to enter the chamber into the cylinder if the piston is in the upper dead point (BMT) and covers the view. There is a risk of damage to the valves or the chamber itself if you move carelessly.
Technology of inspection of cylinders
The inspection process begins with the probe inserted into the candle hole, and try to hold the camera in the center without touching the cylinder walls so as not to leave scratches on the aluminum surface, and smoothly lower the camera down until you see the top edge of the piston, and at this stage, you can assess the condition of the bottom of the piston: the presence of soak, burnouts or detonation marks.
To inspect the cylinder walls, you need to slowly lift the piston, this is done by briefly turning the starter on when the ignition is turned off (for gasoline engines) or by turning the crankshaft manually if you have access to the pulley. Engine scrolling You can see the entire cylinder surface, including the ring area, and move the camera up and down in sync with the piston to keep the gap in focus.
Pay special attention to the upper compression ring stopping area, and this is where bullies are most often formed because of oil film rupture. This looks like vertical stripes or scratches in the image. If you use a Wi-Fi endoscope, take screenshots of the problem areas for analysis. Record the entire process so that you can go back to the frame and look at the defect in more detail.
What to do if the camera is sweaty?
If the cylinder is hot and humid, the lens can get foggy. In this case, carefully remove the camera, wipe dry and let it cool a little in the air. Re-input is possible only after the lens temperature is aligned with the engine temperature. Some models have anti-fogging coating, but it is not eternal.
Interpretation of the image: norm and pathology
The ability to properly decipher what you see on the screen is more important than having a camera. The normal state of the cylinder is a smooth, mirrored surface with a barely noticeable khon grid (the risk from factory processing). It allows a slight dark plaque on the piston and rings, which is the product of combustion of fuel. However, the color of the plaque can tell you about the state of the engine: black dry soda indicates a rich mixture, and a red or red hue indicates the burning of oil.
Critical defects requiring intervention are:
- 🛑 Bullies: Deep vertical furrows, often with ruptured edges, indicate overheating or oil starvation.
- 🛑 Corrosion: Red spots or points on the walls, characteristic of motors that have stood without movement for a long time or worked on poor-quality fuel with water.
- 🛑 The piston burns: Through holes or deep craters on the bottom of the piston, often near a candle.
And I'm going to mention the piston rings, and if you scrolle through the engine and you see that the rings are not pressing against the cylinder walls or have a big gap in the lock, it's a sign of their coking or wear, and if you have a camera, you can also look at the valves, and if you can see underneath them, the pressure on the valve plates reduces compression and reduces heat sink.
Use zoom on your smartphone during your inspection. Digital zoom allows you to see microcracks that are not visible on the overall plan. But don't overdo it so you don't lose focus.
Comparative table of popular models of endoscopes
To make the choice easier, we compare several popular types of devices available in the market, and the data is relevant for mid-range models suitable for garage use.
| Parameter | Budget USB | Middle-class Wi-Fi | Professional |
|---|---|---|---|
| Permission | 640×480 (VGA) | 1280×720 (HD) | 1920×1080 (Full HD) |
| Diameter of the camera | 7-8 mm | 5.5 mm | 3.9.5 mm |
| Illumination | Fixed (6 LEDs) | Regulated | Adjustable, cold light |
| Protection | Basic | IP67 | IP68/Oil-resistant cable |
| Price. | Low. | Medium | High. |
Budget models may be suitable for a one-time oil level check or general condition assessment, but their resolution is often lacking to find bullies. Professional models They often have a rigidly adjustable probe or the ability to replace the camera, which prolongs the life of the device. Remember when choosing a diagnostic tool, saving on it can be more expensive if you miss an emerging problem.
The best choice for a car or boat owner is a 5.5mm Wi-Fi endoscope with adjustable backlight and IP67 protection, a balance between picture quality, usability and price.
Frequently Asked Questions (FAQ)
Can an endoscope be used in a hot engine?
Most amateur cameras have an operating temperature range of 60-80°C. In a running or newly silenced engine, the temperature is much higher, which can lead to melting of the plastic of the camera body or failure of the matrix.
What to do if the camera is stuck in the cylinder?
Don't pull the cable abruptly. Try to gently scroll the engine with a starter (shortly) so that the piston frees up the clamped area. If that doesn't work, you'll have to remove the intake manifold or the block head. Prevention is to carefully enter and control the piston position.
Is the color on the phone the same as it is in reality?
Color reproduction depends on the camera's matrix and the quality of the backlight. LEDs' white light can distort the shades of soda. Experienced diagnosticians focus not only on color, but also on the texture and structure of the sediments. These cameras are not designed to accurately colorimetry.
Do I need to oil the camera before entering?
No, modern cameras are oil-resistant, you don't need lubricant, and you can even make your vision worse by making a film on the lens, if you're new, you just need to clean it, and you don't need to use aggressive solvents to clean the optics.
Will the camera be suitable for examining two-stroke outboard motors?
Yes, but with caution. Two-stroke engines are simpler, but access through the candle hole can be limited to the cooling ribs or the shape of the combustion chamber. A 5.5 mm diameter usually passes without problems. Be careful of the residue of the fuel mixture, which can be aggressive to some types of plastic.