However, when you start seeing it last longer than usual or appear a different color, you know a faulty seal may be the cause. The bluish smoke, which is burned oil, signifies that the engine needs a new seal, even if it clears after several minutes of running the engine.ĭepending on the machines and equipment you use, smoke is often a common form of exhaust. If this happens, it means the residual oil is passing down through the damaged seal and into the combustion chamber. When you start the engine, you may also see blue-tinted smoke appear from the exhaust. Leftover oil will then settle at the top of the valve cover head. Once you start the engine, the seal will contract. After your machine hasn’t run for a while - even overnight - the seal is now cool. One of the best ways to tell if you have a faulty valve seal is to conduct a cold engine test. Six ways to assess whether you have a faulty seal on your hands include: A damaged seal can cause engine oil flooding that will lead to engine failure. However, excess oil can result in carbon buildup, which can lead to many issues, such as:Įssentially, valve stem seals prevent oil from entering the combustion chamber from the cylinder head. Otherwise, too little oil can cause various components to wear as parts rub together. A controlled amount of oil is crucial in maintaining adequate lubrication. Valve stem seals control oil consumption and lubricant in an engine by allowing a specific amount of oil inside the valve stem as it moves.
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