Does the Teana valve cover need to be replaced as a full set?
2 Answers
Does the Teana valve cover need to be replaced as a full set? The function of the valve is specifically responsible for inputting air into the engine and expelling the exhaust gas after combustion. In terms of engine structure, it is divided into intake valves and exhaust valves. The Teana is a flagship mid-to-high-end luxury sedan under NISSAN. In terms of configuration, the Teana 3.5 in the Chinese market has enlarged rear seat space, with additional noise-proof treatment applied to the rear seats. The controls for the air conditioning and audio system are installed on the rear seats, which also feature massage devices. In terms of body dimensions, the Teana measures 4.868 meters in length, 1.830 meters in width, and 1.490 meters in height.
I've been driving a Nissan Teana for several years. Last year, the engine started leaking oil, so I took it in for repairs and asked the technician if I needed to replace the entire valve cover gasket set. He said in most cases, just replacing the gasket is sufficient, as gasket aging is the main cause of oil leaks. After replacing it, the problem was solved, costing only about 100 yuan. If the cover itself isn't cracked or deformed, replacing the entire set is a waste, spending several hundred yuan more unnecessarily. The Teana model often has this issue, and my friend also encountered a similar situation—just replacing the gasket fixed it, saving time as well. When doing routine checks, smell for engine oil odor. If there's a strong smell or obvious leakage, timely action can prevent major repairs. In short, don't rush to replace the entire set; diagnose the problem first before taking action. Usually, just repairing the gasket is enough.
