Guide to fix hot car engine

Guide to fix hot car engine

A car engine overheat is a very dangerous disease that can lead to engine damage. You should understand the causes and remedies to protect your vehicle’s engine.

1. Causes of car engine overheating

– Improper specifications adjustment:

  • For gasoline engines: The timing of ignition and the ratio of the gas mixture plays a decisive role in the capacity of the engine. The gasoline engine’s fuel system has the function of adjusting the gasoline-air ratio to get the optimal mixed gas for all different working modes of the engine. Normally, to completely burn 1 gram of gasoline requires 15 grams of air, we have a ratio of 1/15. Mixed gas with a ratio of 1/13 is called heavy gasoline and 1/17 is poor gasoline. So for the engine to work optimally, the ignition timing and gas mixture ratio must be adjusted according to the manufacturer’s specifications. With the exception of the EFI electronic fuel injection models, the ratio of gasoline to air is always adjusted according to the optimum ratio depending on the operating conditions.
  • For vehicles using carburetors, due to improper adjustment to the technical requirements of the vehicle’s operating modes such as idle mode, acceleration mode, … so the mixture is too dark or too light, which causes loss of labor. Engine power causes overheating.
  • With vehicles using electronic fuel injection systems, it can be caused by clogged nozzles, damaged pressure regulators, damaged sensors, open gas pipe connectors, making the amount of fuel sprayed with no requirements on flow and pressure. Spraying capacity causes overheating.
  • With diesel engine, improper adjustment of high-pressure pump (in terms of injection time and injection flow) also causes hot engine, black smoke.

– Due to operation and use:

  • Lubricating system does not use the correct type of lubricating oil, lack of lubricating oil or is aging lubricating oil, thus greatly affecting the duty of the lubricating system.
  • With overloaded trucks, when climbing slopes often make the water in the cooling system boil over. Pay attention to this cause because if the vehicle is overloaded, it not only affects the cooling system but also causes damage in many other parts. When there is a case of boiling water to stop the car but not turn off the engine, but run garanti about 10 minutes to turn off the engine.
  • Damaged cooling system: The cooling system equipped on the car has the effect of quickly transferring heat from the burning gas to the cooling medium to ensure that the details have optimal working temperature, avoiding phenomena. trapped, burnt, or reduced in mechanical performance. The system has fewer parts and the maintenance is quite simple, but a small mistake will have unpredictable consequences for your car. The cooling intensity must ensure that the engine parts are not too hot and too cold. Therefore, if the cooling system fails to be corrected, it will most likely result in damage to important engine components. This is also one of the “dangerous” failures that will be very serious if not detected in time.

2. Common mistakes of cooling system:

  • Clogged radiator, water tank is too dirty: The water tank includes many flat water pipes, staggered arranged in many rows, in the radiator fins. Due to not being rinsed for a long time, it also causes blockage of the radiator, reducing heat dissipation effect.
  • Damaged fan: Blower is used to speed up the circulation of air passing through the radiator to increase cooling efficiency. For some reason (loose drive belt, stuck due to broken ball, loose fan blade …), the fan does not work, reducing cooling efficiency and causing boiling water, heating the machine.

  • Water pump (centrifugal pump): In the cooling system, the water pump is responsible for supplying water to the cooling system with a certain flow and pressure. If the pump is weak or due to poor drive belt, the water flow and pressure in the system do not meet the requirements.
  • Constant temperature valve: The thermostat valve works to shorten the warm running time to reduce engine wear. The principle of the thermostat valve is to adjust the amount of water passing through the cooling tank according to the temperature of the cooling water. When the engine first starts, the coolant temperature is low, the thermostat closes the cooling water line going into the radiator, the circulating water does not pass through the radiator. When the water temperature rises to 60 degrees Celsius, the valve gradually opens to partially pass the water through the tank, when the water temperature reaches 80 degrees C, the thermostat valve opens the water line through the cooling tank completely.

  • A common case is that a failure of the gasket will cause the water in the cooling system to boil, leading to a hot machine, letting air and oil into the system and easily detected because there is oil and bubbles in the water. When this happens, you must immediately stop the engine and take the car to the nearest garage to check and fix the problem.
  • Modern cars today use glycon-blended coolants to raise the boiling point and lower the ice point. Using this type of coolant, the thermal stress of the components reduces and increases engine efficiency. Some popular types of water such as: Castrol coolant, T-Tech, Turbo …
  • If you really do not want to spend a lot of money on these unfortunate incidents, why not take care of and maintain it yourself. There are a lot of people who don’t realize that with just a few simple tools plus a little sweat you can take care of and ensure the cooling system is always working properly.

3. Take care of regular maintenance

Taking care of the cooling system will help reduce or avoid the consequences and damages caused by the breakdowns. To do that, you must first remember: “Absolutely never open the radiator cap or the water tank cap when it is hot” and do the following:

  • Check the radiator yourself once a month, to prevent leaks, broken filters, and keep the radiator clean. To prevent the radiator from corroding and cool off well, periodically use a watering hose (not a pressure nozzle) with a soft bristle brush to scrub and clean the gaps between the fins. heat.
  • Pay attention to check the water pipes. It is very important to keep your pipes in good condition. Watch for large pipes near the radiator cap and the small pipes at the bottom of the tank. If there are abnormal symptoms such as cracks or edema, the tube must be replaced.
  • Check the cooling water level every time you change the engine oil. Every two years at least, all old coolant should be drained and new water should be filled. Keeping the inside of the system clean helps to prevent corrosion.
  • Once a year, it is recommended to take the car into the garage for a quick check of the cooling system.

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