- Despite their many advantages, black spark plugs are not without their drawbacks. One potential downside is that the black coating can wear off over time, especially in engines that operate at very high temperatures. This can diminish the spark plug's ability to dissipate heat effectively and may eventually lead to reduced performance or engine damage.
It is important to regularly inspect and replace worn-out piston oil seals to ensure the proper functioning of the engine. This can help to prevent costly repairs and extend the life of the engine.
Elring
6. AMOUNT OF LUBRICANT: Seals perform better when lubricated but some machines will go through some dry spells. When this occurs using a leather or PTFE seal will be more beneficial as those type of seals can operate with less lubrication.
Air side face The oil seal surface vertical to the center line of the shaft on the side that does not come in contact with substances to be sealed is called the back face.


Sealing process

Both sealing types are popularly used in different mechanical engineering applications. How are they different? The article explains the fundamental working mechanism of both categories of seals.