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The purpose of the valve stem seal is to prevent the oil from the cylinder head entering the combustion chamber. Valve stem seals play a critical role in. 13 May 2017 Symptoms of a valve stem seals leak? The first is the engine oil level decreased. Your car have blue smoke or gray smoke from car exhaust.4 Aug 2018 When valve seals starts to wear out or fail, they begin to show some evident and distinct symptoms. You will notice the most common sign of cracked or worn valve stem seals just after starting a cold engine. If there are no oil leaks in the engine and yet there is excessive consumption, then this is an When valve seals begin to wear or fail they produce some obvious and unique symptoms. Cold Engine. One of the most noticeable signs of worn or cracked valve stem seals will be just after a cold engine start. Idle and Stop and Go Driving. Off-Throttle Braking. Oil Consumption. Excessive Smoke. 18 Jan 2019 symptoms of bad piston rings and valve seals help prevent leakage of combustion gasses and prevent oil from leaking into the main engine area. material and they're placed into a small collar of the valve stem's top area. 29 Jul 2017 If you have bad valve guide seals, you will notice certain symptoms that As long as there are no oil leaks and that your engine compression is 5 Jun 2014 11 Feb 2016 If the valve seals are leaking it is likely that the piston rings are worn as well. It's a function of age and wear, in most cases. However, if a TDC 2 May 2017 28 Mar 2013