What is the reason for the loud engine noise after replacing the timing chain?

[ArielFitz]

If the engine noise increases after replacing the chain, and if there are no assembly issues, it indicates a break-in gap problem between the chain and the chain guide. Solution: Drive the vehicle to a repair shop to readjust the gap between the chain and the chain guide, then break it in on the road. Timing Chain Replacement: There is no unified standard for how many kilometers a timing chain should be replaced, as the usage and maintenance conditions of each vehicle greatly affect the lifespan of the timing chain. A well-maintained timing chain can last over a hundred thousand kilometers, or even several hundred thousand kilometers without failing. However, if used or maintained poorly, there is still a possibility of breakage or detachment. It is recommended to regularly inspect and maintain the timing chain, allowing professional technicians to determine whether replacement is necessary based on the actual condition of the vehicle.