Are intake and exhaust valve stem seals the same?
Installation Tool. On some applications, the valve stem seals are interchangeable between the intake and exhaust valves and will look exactly the same.
Do you need exhaust valve seals?
As mentioned above, seals on the exhaust valves are not required. There’s always a slight possibility of oil leaking past the valve when the engine is off which could cause a slight puff of smoke when the engine is started if it drips past the open valve and into the cylinder.
Can I replace positive valve seal with umbrella exhaust?
Yes, go positive seal. Preferably a Viton material. Pros over an umbrella are: Higher quality material, less likely to create a “pumping” of oil into the guide, won’t flop around and get cut/fail, controls oil much better, longer lasting, more clearance to spring.
What are the three types of valve seals?
Valve stem seals are made from a variety of materials, including nylon, PTFE rubber, steel, and synthetic rubber. Sometimes these materials are combined into a single sophisticated design. When synthetic rubber is used, there are three basic types: nitrile, polyacrylate, and Viton®.
How much do valve seals cost?
Valve Seals Replacement Cost The cost of this replacement job will be between $900 and $1,800, depending on the make and model of your vehicle. The process of replacing valve seals involves disassembling the entire engine until you can reach the valve spring.
How are intake and exhaust valve stem seals interchangeable?
On some applications, the valve stem seals are interchangeable between the intake and exhaust valves and will look exactly the same. On applications which use different seals on the intake and exhaust valves, due to needing higher temperature material on the exhaust side or different design, the seals will be bagged and labeled appropriately.
How does the valve stem seal control oil consumption?
Valve stem seal play a critical role in controlling valve lubrication as well as oil consumption. If the valve stem seal is worn, the valve guides may be either starved for lubrication or flooded with oil. This will cause the engine to suck oil down the guides and into the cylinders.
What are the different types of valve stem seals?
There are two basic valve stem seal designs: Deflector seals – also called umbrella seals, deflect oil away from the valve stem. They are secured to the valve stem and move with the valve to shield the valve guide from excess oil. Umbrella type seals were commonly used prior to the development of positive type seals.
How many valve stem seals are in Fel Pro gaskets?
This set contains 16 of the same valve stem seal. The valve stem seals in this set utilize a premium FKM material and are designed to function properly on both the intake and exhaust valves and replace both the OE intake and OE exhaust valve stem seals. You can count on Fel-Pro to always use the right material for every application.
How big is an exhaust valve stem oil seal?
They will eventually wear into a 7mm inside diameter. if you mismatch and put the 7mm seals on the 6mm valve stems, you will eventually have oil seepage on start up and possible during vacuum after a couple thousand heat cycles. heed the word of michaelp. metal is for intake, wide flanged rubber is for exhaust.
What happens if too much oil passes through the valve stem seal?
The amount of oil that passes by the valve stem seal must be precisely controlled. Too little oil causes stem and guide wear; too much oil causes carbon buildup leading to valve seat damage, decrease in volumetric efficiency, increased emissions, catalytic converter degradation and excessive oil consumption.
What does a seal on a valve do?
These seals allow the valves to move up and down, while providing a thin film of oil for lubrication. Valve stems ride in valve guides; the seal contains and controls the amount oil used to lubricate the moving stem.
There are two basic valve stem seal designs: Deflector seals – also called umbrella seals, deflect oil away from the valve stem. They are secured to the valve stem and move with the valve to shield the valve guide from excess oil. Umbrella type seals were commonly used prior to the development of positive type seals.