Points to keep in mind when changing the coolant! Don’t overlook the dirt in the reserve tank.

How to

The cooling system of a water-cooled engine is composed of the radiator itself, water pump, thermostat and Although we focus on the radiator cap, it's surprising how often it's located away from those components. It's easy to forget about the reserve tank. This is an important part of the cooling system, which moves the cooling liquid in and out of the system in tandem with the rise and fall of the water temperature to inform the status of the cooling system. Understand your role and maintain it properly.

An inconspicuous but important reserve tank

Even if you open the radiator cap and bring the cooling path to atmospheric pressure, all of the cooling water in the reserve tank is still It does not necessarily mean that they are discharged. The hose nipple leading to the radiator is often located at the bottom of the tank, but if you pump it out It can leave behind a buildup of dirt.

It is recommended that the cooling water, which is essential for cooling a water-cooled engine, be replaced every two years. The change is not as dramatic as with the engine oil, but the radiator core, hoses, and By cleaning the cooling channels inside the engine to remove dirt, cooling efficiency is increased and water temperature is stabilized. It is expected that this will have the effect of

There are many parts to work on when maintaining the cooling channels, such as the thermostat, which helps to warm up the engine and keep it at the right temperature, the water pump, which is essential for circulation, the radiator cap, which raises the boiling point of the coolant, and the radiator core, which is the main driver of heat dissipation, and the condition of the radiator hoses and clamps that connect them.

The reserve tank is working quietly and quietly in the shadow of the main cast! For the radiator and water pump laid out around the engine, the rear of the engine and They are often placed in inconspicuous places, such as behind the side cover, and you don't even know they're there Many of the owners may not be able to afford it.

However, the reserve tank plays an important role in letting you know if the amount of cooling water in the cooling system is adequate. It is. If there's a little bit of coolant leaking from a hose connection somewhere, and you don't notice it and keep running and Going below the minimum limit will cause overheating. The reserve tank has a lower limit of LOW and an upper limit of FULL, so if there's coolant between these two, you can use the reserve tank as a buffer. You will find that there is no problem with the amount of fluid.

In addition, depending on the color and condition of the liquid in the tank, a health check of the cooling system can also be performed. Let me explain the important role of the reserve tank, which is more than just a reserve.

Point 1 - The reserve tank should also be located away from the radiator.
Point 2 - The amount of liquid in the tank must be between FULL and LOW.

The amount of cooling water in the reserve tank is maintained at a constant value while increasing or decreasing.

To clean the interior, you can remove the tank from the body and scrub it with a long-handled brush or use a rag on the end of a stick. Wrap it around and scrub off the dirt. If the water rash is sticking around, have them gargle with an air blow gun with about half a cup of water. It falls well when stirred to

The location of the reserve tank varies from model to model, but just because it's higher than the radiator doesn't mean it's always flowing from the tank into the cooling path and it doesn't mean it's always full and full just because it's mounted low near the step.

Regardless of the difference in height between the radiator and other cooling system elements, the amount of fluid in the reserve tank is The fact that the reserve tank is connected to a sealed system is what makes it fit between LOW and FULL. This is the reason. To begin with, the cooling system is sealed with a radiator cap, which raises the boiling point of the coolant. This is based on the law that the boiling point of a liquid changes with atmospheric pressure. And the reserve tank is also connected to a sealed system, specifically near the mouthpiece of the radiator cap.

When the temperature of the cooling water rises during driving, a temperature sensor allows the cooling fan to cool the radiator core, which in turn cools the radiator core. It is. As the boiling point will remain above 100°C even as the temperature rises due to the pressurizing effect of the radiator cap, it is not possible for the temperature to rise above 100°C. This does not lead to boiling of the cooling water.

By the way, when it boils in the cooling system, bubbles are generated and the cooling water is boiled in the same way as water is boiled in a kettle. It makes circulation difficult and reduces cooling efficiency, increasing the risk of overheating. Therefore, pressure is also necessary to circulate it in a liquid state.

However, since many hoses are used in the cooling channels, there is a limit to the boiling point increase due to the pressurization. It is. When the cooling water temperature rises above a certain pressure, the valve in the radiator cap opens to release the cooling water. The system is designed to let you escape. Its escape is the reserve tank.

At high temperatures, the cooling water flows from the radiator to the reserve tank, but as the water temperature drops, the high temperature At times the increased pressure drops and in turn the pressure in the radiator becomes negative. Then the valve in the radiator cap opens again, and enough coolant to compensate for the negative pressure is released into the reserve tank back into the cooling path from the

The amount of fluid in the reserve tank of a disc brake decreases in conjunction with pad wear, but the cooling The reserve tank in the pathway is characterized by moving in and out of the reservoir as the temperature of the cooling water changes. This allows the reserve tank to be filled to a level between LOW and FULL, regardless of the height of the reserve tank mounting position. I think you can understand why it's settled.

Point 1 - The reserve tank absorbs changes in temperature and pressure of the cooling water.
Point 2 - The opening and closing of the radiator cap and the cooling water are linked.

The way the inside of the tank is soiled reveals the corrosion of the cooling channel.

The outside of the tank was also dirty, so I didn't notice the dirt inside, but there was a lot of water scum on it. It was fortunate that there was no whitish flotsam that indicated corrosion of aluminum or red rust that indicated corrosion of steel parts. If it's a used car, once it's been thoroughly cleaned, you'll be able to catch any changes in the cooling path by the dirt and changes in the coolant It's like.

The reserve tank, which acts not to compensate for the decrease from within the cooling path but also to allow coolant to escape to avoid a proportional increase in pressure as the temperature rises, will show signs of what's going on inside the engine and radiator.

The coolant itself will be contaminated with dirt due to its ageing, of course, but there will also be a mixture of whitish suspended matter and Solids from the corrosion of aluminum parts such as the crankcase and radiator core are circulating when there is Possibly. Also, the brownish stains may have been caused by red rust from the iron parts circulating in the system.

The green long-life coolant contains a corrosion inhibitor component, but if you continue to use it beyond the replacement period, its ability to prevent corrosion will be reduced, and if you cool it down with tap water alone without coolant, corrosion will progress further.

If the reserve tank is higher than the radiator, the remainder of the reserve tank will flow into the radiator when you open the radiator cap and the reserve tank cap, but if the model has the reserve tank at a lower position on the body, it will not come off due to atmospheric pressure, so you will need to disconnect the hose that connects the radiator cap and the tank and drain the remainder of the tank.
At the same time, clean the inside of the hoses that connect the tank to the radiator, which is always filled with coolant.

Reserves that allow the cooling water to move back and forth as the temperature and pressure of the cooling water changes, and to keep track of the state of the cooling channels. The tank is not just a spare tank. If you are a water-cooled engine owner, you may want to check the location of the reserve tank and how dirty it is. Let's.

When changing the coolant, fill the radiator cap to the fullest extent possible and start the engine. When the air in the hose is expelled as much as possible, install the cap. Fill the reserve tank to FULL and let the cooling water temperature rise and fall for one cycle on a test run. Then, check the amount of cooling liquid again.

Point 1 - Dirt in the reserve tank shows the deterioration of the cooling channel.
Point 2 - Check the amount of cooling water and dirt at the same time.

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