What are the symptoms of increased valve clearance?

1 Answers
Ellen
07/28/25 2:54pm
Symptoms of increased valve clearance: 1. Excessive valve clearance causes impact noise between transmission components and between the valve and valve seat, accelerating wear; 2. Reduces the duration of valve opening, worsening cylinder charging and exhaust conditions; 3. Power decreases, and in severe cases, the engine may even be difficult to start. To eliminate this phenomenon, a certain clearance is usually left between the valve and its transmission mechanism during cold assembly of the engine to compensate for the thermal expansion of the valve; 4. When the engine is running, the valve will expand due to temperature rise. If there is no clearance or insufficient clearance between the valve and its transmission components in the cold state, the thermal expansion of the valve and its transmission components in the hot state will inevitably cause the valve to fail to close tightly, resulting in air leakage during the compression and power strokes of the engine.
Was this review help?
2
0
Share
More Forum Discussions

What is the trunk size of the X-Trail?

The trunk capacity of the X-Trail is 479 liters. Below are its relevant details: Precautions for the trunk: Do not fill the trunk to capacity during daily short-distance driving; do not treat the trunk as a 'storage room'; do not leave or forget food in the trunk; it is best to use trunk mats made of synthetic fibers, cotton, or wool, and avoid heavy floor mats, as a set of floor mats can weigh between 10 to 15 kilograms, which can affect fuel consumption. Do not place flammable or explosive items such as lighters or hairspray in the trunk, as the trunk space is more enclosed, and under high temperatures and bumpy roads, there is a risk of explosion. Functions of the trunk: The trunk is used for storing spare items and carrying goods; it typically contains the car's spare tire, emergency kit, tool kit, warning triangle, and fire extinguisher.
5
5
Share

What are the penalty items for hill start?

There are many penalty items. The specific details are as follows: Front bumper not aligned with the pole line: After the vehicle stops, if the front bumper is not aligned with the pole line and does not exceed 50 cm forward or backward, 10 points will be deducted (originally 20 points). Distance from the road edge line exceeding 30 cm but not exceeding 50 cm: After the vehicle stops, if the body is more than 30 cm but less than 50 cm from the road edge line, 10 points will be deducted (originally 20 points). Distance from the road edge line exceeding 50 cm: After the vehicle stops, if the body is more than 50 cm from the road edge line, 100 points will be deducted. Vehicle rolling back 10-30 cm: After starting, if the vehicle rolls back 10-30 cm, 10 points will be deducted. Engine stalling: If the engine stalls once due to improper operation, 10 points will be deducted. Parking brake not fully engaged: If the parking brake is not fully engaged after stopping, 10 points will be deducted.
1
1
Share

How much horsepower does an ATS-L gain with a stage 3 tune?

With a stage 3 tune, the ATS-L can achieve approximately 400 horsepower at the wheels, with engine output reaching close to 500 horsepower. Below is an introduction to horsepower calculation methods and classifications: Horsepower calculation methods: 1 horsepower is approximately equal to 735 watts. This generally refers to metric horsepower rather than imperial horsepower. 1 horsepower equals the work done to lift 75 kilogram-force meters in 1 second, also equivalent to 0.735 kilowatts, known as metric horsepower. 1 imperial horsepower equals 550 foot-pounds-force per second, equivalent to 76 kilogram-force meters per second, or 0.746 kilowatts. In China's legal measurement units, the unit of power is the watt. Horsepower classifications: Horsepower can be divided into two types: metric horsepower and imperial horsepower.
2
1
Share

Can I Add Water When the Coolant Is Low?

When the coolant is low, you can add an appropriate amount of soft water, commonly known as distilled water, which has undergone deionization and softening treatment. However, the amount added should not be excessive, as it may alter the boiling and freezing points of the coolant. It is important to note that tap water or other hard water should never be added when the coolant is low. Adding such water can lower the boiling point and raise the freezing point of the coolant, making it prone to freezing in cold climates and reducing its effectiveness. When purchasing coolant, always choose the same brand and model as the original one used in the vehicle. If a different brand or model is used, the original coolant must be completely drained before adding the new one. Different brands and models of coolants may have varying formulations, and mixing them could lead to chemical reactions that impair the coolant's performance.
14
1
Share

What is the range of the Tesla Model 3 in kilometers?

Tesla Model 3 is divided into the Standard Range version and the Long Range version. The Standard Range version has a range of 480 kilometers, while the Long Range version offers ranges of 590 kilometers and 664 kilometers. Factors affecting the range and the standards are as follows: Factors affecting the range: The vehicle's range is influenced by various factors, such as battery high and low-temperature technology, battery BMS technology optimization, upgrades to the vehicle's energy recovery system, lightweight body design, and energy-saving technologies in hardware equipment. Additionally, external driving conditions, air resistance coefficient, mechanical transmission efficiency, vehicle weight, number of passengers, and other factors can also impact the actual range of an electric vehicle. Electric vehicle range standards: Currently, domestic electric vehicle manufacturers generally adopt the NEDC standard and the WLTC standard. Since the NEDC standard is considered too idealistic, future manufacturers will use the WLTC standard to calibrate the range, which provides more meaningful reference data.
5
1
Share

What is the fuel tank capacity of the 2021 Honda CR-V in liters?

2021 Honda CR-V's fuel tank capacity varies between 53L and 57L depending on the configuration. Below are relevant details about the fuel tank and its capacity: Methods to check fuel tank capacity: Generally, the fuel level is observed through the fuel gauge inside the vehicle. If there are no other issues, the fuel level will be accurately reflected on the gauge. The fuel gauge on the dashboard has 5-6 segments, with each segment representing the remaining fuel capacity in the tank. It is advisable to refuel when the fuel gauge shows only two segments left to avoid running out of gasoline midway. Precautions when refueling: After turning off the vehicle, the owner should not lock the car directly. Instead, the fuel tank should be opened by pressing the fuel tank cover switch first. The fuel attendant will then open the inner fuel tank cap for refueling.
2
5
Share
Cookie
Cookie Settings
© 2025 Servanan International Pte. Ltd.