Does the Timing Chain of the Old Tiguan Need to Be Replaced?
3 Answers
The chain also needs to be replaced, but not on a regular basis. It should be replaced based on actual conditions—when there is a malfunction or abnormal noise. If there are no issues, replacement is unnecessary. The chain won't break, but it may stretch. When stretched or if the tensioner malfunctions, the chain may skip teeth, which can damage the engine by impacting the valves. Functions of the timing chain: 1. Drive the engine's valve train: It ensures the intake and exhaust valves open or close at the right time, allowing the engine cylinders to intake and exhaust normally. 2. Drive: Chain-driven systems are reliable, durable, and space-saving. The entire system consists of gears, chains, and tensioning devices. The hydraulic tensioner automatically adjusts the tension, maintaining consistent chain tension and requiring no maintenance throughout its lifespan, making it as durable as the engine itself. 3. Robust and durable: Timing chains have inherent durability, offering peace of mind without concerns about "long-term neglect" or "breaking down at critical moments." However, when the vehicle's total mileage reaches 100,000 kilometers, the drawbacks of the timing chain begin to emerge.
The timing chain on the old Tiguan is indeed something to pay attention to, as chain stretching is a common issue with this model. Most owners I've encountered report noticeable chain elongation after 80,000 kilometers, with the rattling sound during cold starts serving as a warning sign. Don't push your luck—I once saw an old Tiguan at a repair shop with 200,000 kilometers on the original chain. It skipped a tooth and bent the valves, driving repair costs up to nearly 20,000 RMB. I recommend having a mechanic check the camshaft position data with a diagnostic tool every 50,000 kilometers. If the deviation exceeds 5 degrees, it's time for a replacement. While labor costs may be high, it's far better than an engine overhaul. Replacing the tensioner and guides at the same time is also a wise move. Using full synthetic oil can slow wear, but don't hesitate when it's time for a replacement.
I've been researching the timing chain issues with the old Tiguan for quite some time, and the key problem lies in the design flaw of the tensioner. After driving over 100,000 kilometers, you need to be especially cautious. That 'clanking' noise upon startup basically announces the chain's retirement. I've seen several owners who thought it was maintenance-free for life and pushed it to 150,000 kilometers, only for the stretched chain to cause timing misalignment, leading to the tragic scenario of valves and pistons making intimate contact—repair costs could amount to half an engine replacement. During maintenance, make sure the mechanic uses a borescope to check the chain stretch; if it exceeds 3%, replacement is a must. Don't cut corners by just replacing the chain; you need to update the matching tensioner and guides to fully resolve the issue. This money is well spent, as no one wants to be stranded on the highway.
