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Yesterday afternoon, a rescue trailer arrived at the store, carrying a Volkswagen Passat. Upon inquiry with the driver, it was found that the vehicle had been towed back from the highway and suddenly encountered a problem while driving. The owner reported that there was a strange noise in the gearbox and dared not continue driving. After being towed to the store, the Passat was still on the trailer. The driver found that even when in neutral, the car would not slide down after releasing the brake. He tried to press the clutch pedal to start the engine, and when he slowly released the clutch, he could hear a clicking sound from inside the gearbox. Fortunately, the car could still move slowly, so he drove it to the workstation. The instrument display shows that the total mileage has exceeded 300000 kilometers and has been in use for at least 15 years. At first, the master thought it was a problem with the ball cage inside the half shaft, but after inspection, it was confirmed that it was not, and it was likely a problem with the gearbox itself. Then, the master lifted the Passat up and let's first see what the chassis looks like. As shown in the figure below, the front suspension is mostly made of aluminum alloy components, which were similar to Audi's chassis back then. The subframe is dedicated to the engine longitudinal platform and is now protected by a large iron guard plate, which was later installed by the owner and has two obvious oil stains. The oil stains on the protective plate come from the gearbox, as shown in the figure below. There is a lot of sludge at the bottom of the gearbox, which is leaking out from the oil seal at the half shaft position. The rear suspension is a torsion beam non independent suspension, and the fuel tank is designed at the rear of the suspension. Nowadays, few cars design the fuel tank at the rear of the rear suspension. If there is a rear end collision, the fuel tank is easily squeezed. There is a problem with the rear suspension now, as indicated by the arrow in the figure below, which has undergone deformation. It can be seen that it has been significantly impacted and cracks have appeared, making it unsafe. After inspecting the chassis, the technician continued to check for the issue of abnormal gearbox noise, as shown in the following picture. The lower guard has been removed, and it can be seen that the gearbox is basically wrapped in oil sludge. The master asked another master to start the engine and shift the gear inside the car, and confirmed that the problem was inside the gearbox, as if a damaged part had stuck in the gear. How should this be repaired? Do we need to disassemble the gearbox for maintenance? The master said that disassembling the gearbox for maintenance is particularly uneconomical. Many of this old Passat are scrapped, so it is possible to directly find a disassembled gearbox from the dismantling factory. The price is cheap and the quality is guaranteed. With the consent of the car o...

A Honda car came for maintenance, the model is the 2013 1.8L Automatic Comfort Edition Jade. The owner purchased it in early 2014 and it has been 11 years since then. It can be considered an old car. What is the condition of a car that has been in use for so long? First, let's take a look at the engine compartment, where the two main cores of the car are hidden, namely the engine and gearbox. As shown in the figure below, the engine compartment has almost no signs of oil or water leakage except for some dust. The engine model is R18Z6, a 1.8-liter naturally aspirated type. So far, except for replacing spark plugs and batteries, there have been no other problems. The gearbox is a 5-speed automatic type. Before draining the old engine oil, the technician pulled out the oil dipstick to check. If the oil level is normal, it indicates that the engine is not burning oil. Its instrument design is quite unique, located very close to the windshield. As shown in the instrument panel below, the total mileage exceeds 240000 kilometers, nearly 250000 kilometers, which is quite a lot, averaging over 20000 kilometers per year, indicating that the owner uses the car frequently. Raise the car to look at the chassis, as shown in the following picture. The bottom of the engine and gearbox are equipped with aluminum alloy lower protective plates, and the reserved holes are oil drain holes and oil change filter holes. There are no signs of oil leakage at the bottom of the engine and gearbox. The middle part of the chassis is protected by a plastic protective plate, and there are no obvious scratches. Looking at the left front suspension, the lower arm is welded from double-layer stamped steel plates. Upon inspection of the ball joint and rubber sleeve of the lower arm, there are no issues except for the damaged rubber sleeve of the steering outer rod ball joint. However, the internal ball joint is not loose and can continue to be used, while the other components are fine. Check the right front suspension, just like the left suspension, only the rubber sleeve of the steering outer rod ball joint is damaged, and there is still no problem inside. Looking at the rear suspension, the double wishbone independent suspension type, the condition of each component is quite good. The front of the rear subframe is a 50 liter fuel tank, and there are no scratches on the bottom. When we look at the structure of the rear suspension, it is basically the same as the rear suspension structure of Honda models such as CR-V at the same time, but since 2017, it has become an E-type multi link independent suspension. After the chassis inspection, the master checked the condition of the four tires and found that only the outer side of the right rear wheel had some problems, as shown in the figure below, with obvious scratches. Fortunately, the wound was not very deep and did not have a significant impact on safety. As shown in the figure below, there is a scratch at this location, and the n...

A 2020 Nissan Tuda was brought into the dealership, produced in June 2022 and has been in operation for over 3 years now. The total mileage has just reached 40000 kilometers, and this visit was for engine maintenance. Taking this opportunity, let's take a look at its condition. First, let's take a look at the overall structure of the car. It adopts a non load bearing body structure with independent beams, which has stronger overall rigidity and torsional resistance. True off-road vehicles generally have this body structure, while the common body structure we see is a load bearing body structure. As shown in the figure below, the front suspension is a double wishbone independent suspension, the lower wishbone looks relatively thick, the stabilizer bar is also very thick, and there are protective plates at the bottom of the engine and gearbox. Looking at the middle part of the chassis, you can see a thick crossbeam, and the exhaust pipe from front to back has made a bend at the fuel tank position. As shown in the figure below, you can see the fuel tank and the sturdy transmission shaft. The fuel tank has a capacity of 73 liters, and the support of the lift is located at the bottom of the crossbeam. Looking at the rear suspension, it adopts a five link integral bridge non independent suspension, with a differential inside the rear axle. This structure makes its off-road performance and driving comfort relatively good. After inspection, all components of the chassis are in good condition and there are no abnormal situations. After draining the old engine oil and replacing the oil filter, the master put down the car and added new oil. The engine has a 2.5-liter displacement, and maintenance requires adding nearly 5 liters of new oil. The transmission is a 7-speed automatic type. Check the brake oil, there is a Bosch mark on the oil tank, the oil level is still at the specified level, and the water content is normal during testing. There is no need to replace it temporarily Check the battery, as shown in the figure below. This is a start stop dedicated battery with normal starting voltage and current. The power steering system uses hydraulic assistance, and the oil level of the power steering oil is checked to be normal. The entire power steering system is functioning properly. Looking at the instrument panel, this is a picture taken when the key was just turned on. Currently, only the tire pressure of the left front and right rear wheels is displayed, both of which are 2.5 bar. About five seconds later, the tire pressure of the other two wheels is also displayed, which is 2.5 bar. Looking at the fuel consumption displayed on the dashboard, the average is 10.6 liters per 100 kilometers, and the average speed is also 32 kilometers per hour. This fuel consumption is still acceptable, after all, the curb weight of the car is over 1900 kilograms. Overall, this Nissan Tuda performs very well in terms of both the engine compartment and chassis.

A Volkswagen Sagitar was brought in for maintenance and inspection. The car was manufactured in August 2018 and had traveled only over 40,000 kilometers in more than seven years. The owner mentioned that he rarely drives this car, covering just 5,000 to 6,000 kilometers annually, and typically gets it serviced once every December. During the whole car inspection, the master encountered a rare situation where the air conditioning filter of the car was severely damaged. Taking the opportunity of maintenance, let's take a look at the condition of this Sagitar. As shown in the figure below, the air filter assembly on the upper part of the engine has been removed. The engine is a 1.4T type with a low failure rate, and the matching gearbox is a 7-speed dry dual clutch type, which has not encountered any problems. Raise the car to look at the chassis, as shown in the following picture. There is a large plastic protective plate at the bottom of the engine and gearbox, and there are two holes in the gearbox position. The technician said it is for cooling the gearbox. The front part is a MacPherson independent suspension, the lower support arm is made of single-layer steel plate stamping, with a perforated design in the middle, and the steering knuckle is made of cast iron material with a layer of rust on the surface that does not affect safety. The steering rod ball head, lower support arm ball head, small connecting rod, shock absorber and other components were inspected and found to be in normal condition. Check the middle part of the chassis. There are two obvious scratches on the bottom of the plastic fuel tank, but it does not affect safety. There is no problem with the rest of the parts. Look at the rear, multi link independent suspension type. Check the rear suspension components, mainly checking that the rubber sleeves and shock absorbers at the connection positions are in normal condition. When checking the tires, the master found that the condition of the two rear tires was very poor, as shown in the picture below. There were very obvious large cracks on the edges of the tires, and the master said that such tires have significant safety hazards. Looking at the production date on the side of the tire, 2318 indicates whether the tire was produced in the 23rd week of 2018 or the original configuration of the car, and indeed needs to be replaced. At the same time as the old engine oil was released, the technician replaced the oil filter and then put down the car. When inspecting the air conditioning filter, it was found to be particularly dirty, as shown in the picture below. This is the side of the air conditioning filter that filters the air, with a lot of dust and impurities. Looking at the back of the filter element again, it is already damaged and detached, as shown in the picture below. How did this filter element become like this? Looking at the side of the air conditioning filter again, the master was momentarily speechless and didn't know w...

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