Conditions for Applying for Automotive Repair Qualification

How to Fill in the Vehicle Model for a Custom License Plate?

When filling in the vehicle model for a custom license plate, you can refer to the manufacturer's model on the invoice. If you are filling it out on the 12123 traffic management app, the vehicle model will be automatically recognized after completing the previous field, displaying multiple vehicle models. Then, simply select the corresponding model based on the manufacturer's model listed on the invoice. Below are some relevant introductions about vehicle license plates: 1. Introduction 1: A vehicle license plate refers to the number plates displayed on both the front and rear of a vehicle. These plates are typically made of aluminum, plastic, or stickers and display the vehicle's registration number, registration region, or other basic information. 2. Introduction 2: If registering a license plate for your vehicle at the DMV, the vehicle model should be filled in according to the original model of the vehicle. Additionally, other materials are required for vehicle registration, including the owner's ID, the vehicle's certification of compliance, and proof of insurance for the vehicle.

4

1

Share

What Hazards Can Engine Overheating Cause?

Engine overheating can lead to several hazards including decreased engine charging efficiency, abnormal combustion, oil degradation, and ignition wire damage. Decreased engine charging efficiency: Due to engine overheating, the temperature inside the engine compartment rises, reducing the engine's air intake capacity. Abnormal combustion: The temperature of the air-fuel mixture entering the cylinders increases, raising the overall operating cycle temperature of the engine. With low radiator efficiency, the engine remains overheated, causing the end-gas mixture in the combustion chamber to absorb more heat, accelerating pre-flame reactions and increasing the likelihood of knocking. Oil degradation: Under high temperature and pressure, engine oil's oxidation stability deteriorates, accelerating thermal decomposition, oxidation, and polymerization processes. Ignition wire damage: When driving in high-temperature environments, overheating ignition coils can weaken high-voltage sparks, leading to engine misfires at high speeds. In severe cases, ignition coils may burn out, affecting normal vehicle operation. Causes of engine overheating: Water pump failure: A damaged water pump prevents coolant from circulating in the cooling system, failing to dissipate heat generated by engine combustion. Insufficient or substandard coolant: Lack of coolant means no cooling medium in the system to transfer engine heat, causing overheating. Additionally, modern engines operate above water's boiling point; using water or unqualified coolant can also lead to overheating. Thermostat failure: A malfunctioning or stuck thermostat restricts the engine to a small coolant loop, rendering the radiator ineffective and reducing cooling capacity, resulting in overheating. Fan issues: Fan problems may stem from physical damage (e.g., broken blades, seized operation, or snapped belts) or control circuit failures preventing proper electronic fan operation. Dirty radiator surface: Contaminants on the radiator impair heat conduction, hindering effective heat dissipation to the air and causing engine overheating. How to handle engine overheating: Stop driving and open the hood to allow heat dissipation. Apply coolant over the engine to facilitate heat removal through circulation.

19

4

Share

How to Pass the Vision Test at the Vehicle Management Office?

Here are the methods to pass the vision test at the Vehicle Management Office: 1. Method 1: Wear glasses with the appropriate prescription for the test. The vision test for a motor vehicle driver's license requires corrected vision, not necessarily uncorrected vision. 2. Method 2: Get re-examined at a hospital. If you fail the vision test at the Vehicle Management Office, you can have a re-examination at a hospital and then submit the medical examination form and relevant payment receipts to the driving school. 3. Method 3: Correct your vision. If you fail the first test, you can visit an ophthalmology hospital to correct your vision. Once your vision meets the required standards, you can take the test again.

2

5

Share

Will points be deducted if the side line exceeds 30 centimeters?

Currently, examination vehicles are equipped with GPS positioning. White road lines, margins, traffic lights, crosswalks, bus stops, etc., are all integrated into the system and fully networked. The requirement for parallel parking is 30 cm, ideally within this range. Exceeding 30 cm results in a 10-point deduction, as long as the vehicle is parked by the side and not in the middle of the road. The following are the point deductions for parallel parking: 1. First point: Stopping midway results in a 100-point deduction. 2. Second point: Driving over the lane line with the tires results in a 10-point deduction. 3. Third point: The vehicle body exceeding the line after parking results in a 100-point deduction. Although the rules state that causing the engine to stall due to improper operation deducts 10 points, stalling during parallel parking is equivalent to stopping midway, resulting in an immediate 100-point deduction.

2

1

Share

Should the Han DM use 92 or 95 octane gasoline?

The Han DM should use 92 octane gasoline, as this fuel grade is recommended in the vehicle's official user manual. In addition to checking the appropriate gasoline grade in the user manual, the fuel cap of the Han DM will also indicate the recommended grade. Generally, the fuel grade can also be determined based on the engine's compression ratio. Vehicles with a compression ratio between 8.6-9.9 should use 92 octane gasoline, while those with a compression ratio between 10.0-11.5 should use 95 octane gasoline. If the compression ratio is even higher, 98 octane gasoline is recommended. However, with the application of new technologies, the compression ratio alone cannot determine the fuel grade, as high-compression engines can also be tuned to use lower-octane fuel. Other factors, such as ignition timing, turbocharging technology, and Atkinson cycle technology, also play a role. Generally, the higher the gasoline grade, the higher the octane rating and the better the anti-knock performance. 92 octane gasoline contains 92% isooctane and 8% n-heptane, while 95 octane gasoline contains 95% isooctane and 5% n-heptane. If the Han DM occasionally uses the wrong gasoline grade, simply switching back to the correct grade after consumption is sufficient. However, long-term use of the wrong grade can have the following effects: For vehicles designed for lower octane fuel, using a higher grade will not cause damage, but the increased octane rating may alter the fuel's ignition point, leading to delayed combustion in the engine. This reduces both the engine's power output and thermal efficiency, resulting in poorer performance. For vehicles designed for higher octane fuel, using a lower grade can cause engine knocking. The significantly lower octane rating lowers the fuel's ignition point, causing premature ignition during the compression stroke. If combustion occurs before the spark plug fires, resistance is created during the upward stroke. This resistance makes the engine run very unstably. Mild knocking may only increase noise without significant engine damage, but severe knocking indicates serious engine issues, affecting driving stability and causing abnormal wear on pistons and cylinders, potentially leading to cylinder scoring.

4

0

Share

Why Can't a Diesel Truck Start After Stalling?

Issues affecting the failure to start a diesel truck are as follows: 1. Check the spark plugs: Since spark plugs are crucial to the vehicle's ignition system, and the ignition system is key to engine operation, the performance of the spark plugs directly impacts the overall working performance and efficiency of the vehicle. 2. Battery depletion: The characteristic symptoms include the starter motor beginning to turn but with insufficient speed or power, followed by the starter motor only making a clicking sound without turning. In winter, low temperatures and forgetting to turn off certain electrical devices can lead to the vehicle failing to start, especially after prolonged short-distance, low-speed use in winter, which can cause the battery voltage to drop below the rated value, making starting and normal rotation impossible. 3. Fuel flow obstruction: The characteristic symptom is the absence of oil pressure in the engine's fuel supply line. This situation often occurs on particularly cold mornings and is caused by long-term contamination of the fuel lines. At very low temperatures, water and debris can mix, blocking the fuel lines and resulting in failure to start.

2

Share

Conditions for Applying for Automotive Repair Qualification

How to Fill in the Vehicle Model for a Custom License Plate?

What Hazards Can Engine Overheating Cause?

How to Pass the Vision Test at the Vehicle Management Office?

Will points be deducted if the side line exceeds 30 centimeters?

Should the Han DM use 92 or 95 octane gasoline?

Why Can't a Diesel Truck Start After Stalling?

Does Prolonged Idling with Air Conditioning On Affect the Engine?

What happens if I accidentally drive into a bus lane?

Where is the engine number of Dongfeng Tianjin located?

What to Do If the Car Underbody Shield Falls Off?