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How to Determine Timing Chain Skipping Teeth?

2 Answers

StTanner

07/25/25 5:35am

Skipping teeth phenomenon: Due to overload or improper design and manufacturing, the phenomenon where the flexible gear teeth slip out of the rigid gear teeth during meshing. Below is relevant information: 1. Skipping teeth phenomenon: During the use of the toothed belt, its tension will decrease due to wear. If the tension of the toothed belt is not adjusted in time, the toothed belt skipping teeth phenomenon will occur. Therefore, to ensure the normal operation of the engine, the tension of the toothed belt should be checked and adjusted regularly. The interval for inspection and adjustment should be determined based on the road conditions and climate conditions the vehicle is driven in. 2. Function: The main function of the engine timing belt is to drive the engine's valve train, ensuring that the engine's intake and exhaust valves open or close at the appropriate time to guarantee normal air intake and exhaust in the engine cylinders. In some models, such as the Volkswagen Jetta (EFI), Santana 2000, Bora, Audi, etc., the timing belt also takes on the task of driving the water pump.

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OAvery

08/10/25 5:48pm

I often help my friends check car issues, and the key to determining if the timing chain has skipped a tooth is observing engine symptoms. When driving, if the engine is particularly hard to start, idles roughly to the point where the car shakes violently, experiences noticeably reduced power during acceleration, or makes louder noises resembling metal clanging, it might indicate a skipped timing chain. I would recommend first scanning for trouble codes with an OBD scanner. If you find timing-related codes like P0340, focus your inspection there. You should also open the hood to check if the chain is loose or shows excessive wear—a loose chain often produces a rattling noise, especially during cold starts. If not addressed promptly, a skipped tooth can cause the valves and pistons to collide, leading to major engine repairs. So, if you notice these signs, it’s best to have a professional repair shop confirm and fix the issue to avoid costly major repairs later.

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