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Valve stem seals help prevent oil from leaking into the combustion chamber through the valve guides. They also help control the lubrication of the valve stems and guide them properly within the cylinder head.

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Q: What is the function of valve stem seals?
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What is a rubber valve stem seals?

Rubber valve stem seals are the parts used to keep tires from leaking around the valve stems. They provide a tight seal which also keeps them securely in place.


How will a car act if the valve stem seals are bad?

If the valve stem seals are bad the intake valves will "suck" oil into the cylinders. One common indicator of worn valve stem seals is to take your foot off the accelerator for several seconds when going downhill, then watch for smoke when you step on the accelerator again. If you see a puff of BLUISH smoke, you probably have bad valve stem seals. The catalytic converter can become oil fouled so that would be another indicator that you might have valve stem seal problems.


Why is there oil on the spark plug threads?

valve stem seals


You just replaced your head gasket on your 97 blazer and now you have oil in your carb is there anything else besides the PCV valve that would cause this?

did you check the condition of the valve stem seals while you had the head off? bad valve stem seals will allow oil to leak into inlet manifold . the head needs to be off to change valve stem seals


Symptoms of Valve seals leaking?

If the valve stem seals are bad the intake valves will "suck" oil into the cylinders. One common indicator of worn valve stem seals is to take your foot off the accelerator for several seconds when going downhill, then watch for smoke when you step on the accelerator again. If you see a puff of BLUISH smoke, you probably have bad valve stem seals. The catalytic converter can become oil fouled so that would be another indicator that you might have valve stem seal problems.


Can you use oil treatment for bad valve stem seals?

No, oil treatment will react in the same way as regular oil. Replace the valve seals.


What is or does valve stem OD mean?

Valve stem OD refers to the outer diameter of a valve stem. This measurement is important for determining the size compatibility between the valve stem and other components in a system, such as seals or guides. Choosing the correct valve stem OD ensures proper fit and functionality.


How do bellows valves work?

Bellow is similar to a hollow flexible hose. It functions like a vertical diaphragm (parallel instead of perpendicular to valve stem). It seals with the valve stem at one end, and seals with the valve body at the other end. Therefore, it allows a small relative move between valve stem and body, but prevents fluid from leaking across bellow surface. The move pushes seat or stem tip for valve to close or open. --SteveX


What would cause a lot of oil in cylinders about a cup in two of them?

bad valve stem seals


How do you replace valve stem seals 1989 Jeep?

How do you replace valve stems and guides on a 1989 Jeep 4 Cylinder engine?


Do heads have to be removed to replace valve guides and valve stem seals on a 1995 Mazda millenia?

yes heads need to be removed


Why does your 1987 Corvette puff blue smoke when you first start it?

The engine valve stem seals are worn. Usually valve stem seal replacement is all that is needed, occasionally there is wear in the valve stems and/or valve guides which requires further repair.