Valve stem seal leaks can lead to a variety of issues, including oil consumption, smoke from the exhaust, and decreased engine performance. Here are seven questions to help diagnose a valve stem seal leak:
Is the engine burning oil? One of the most common symptoms of a valve stem seal leak is oil consumption. If the engine is burning oil at a high rate, it could be a sign of a leak.
Is there blue smoke coming from the exhaust? Another common symptom of a valve stem seal leak is blue smoke from the exhaust. This is caused by oil leaking past the valve stem seal and burning in the engine.
Is the engine running rough or misfiring? A valve stem seal leak can cause a loss of compression in the affected cylinder, which can lead to a rough running engine or misfires.
Is the engine losing power? If the valve stem seal leak is severe enough, it can lead to a loss of power and decreased engine performance.
Are there oil leaks around the valve cover? In some cases, a valve stem seal leak can cause oil to leak around the valve cover gasket. If you notice oil leaks in this area, it could be a sign of a valve stem seal leak.
Is the engine making a ticking or clicking noise? A valve stem seal leak can cause a ticking or clicking noise as the engine loses compression and the valves don't seal properly.
Is the engine overheating? In rare cases, a valve stem seal leak can cause the engine to overheat due to oil leaking into the combustion chamber and causing the engine to run too hot.
Valve cover gasket leakage and repair 