Replacing the timing chain with a Buick that has driven 250000 yuan

Why do most cars need to replace the timing chain after driving a certain distance. Just like the Buick that drove 250000 yuan today, the owner reported that during the driving process, the engine made a strange noise when the fuel door was on. After our preliminary inspection, the source of this sound is from a timing chain. Before disassembling, let's clean the joint between your cylinder head and valve chamber.

To prevent dust from falling into the engine when it is opened, it appears that the engine is well maintained. You can see that the gap between the chains is very large. Let's also remove the lower chain cover and take a look. Look at this guide plate, which is completely broken. The removed guide plate is already several pieces.

At this point, when you look at the new chain and the old chain, the gap is already very obvious. Next, let's take a look at this new guide chain. Before installation, let's clean the lid thoroughly. The colored link is located here. Now that the installation has been completed and the car has been started, try starting the car. The error display has been completely eliminated. Then we will try the car. If there are no problems, we can deliver the car.