- The interplay between these two components is critical. A faulty valve cover gasket can lead to oil contamination on spark plugs, causing them to malfunction. Conversely, worn spark plugs can lead to increased oil consumption due to uncontrolled combustion. Hence, the synergy between a well-sealed valve cover and efficiently firing spark plugs is pivotal for a smoothly running engine.
Double Lip Oil Seals
Repeat the process of installing oil seals for any other locations where they are required. Be sure to follow the same steps for each installation to ensure a leak-free performance.
Heat and attrition are generated by the parts moving against each other. The sealing function can only be ensured if an intentional defined leakage of oil is able to exit for seal lubrication, preventing seal wear and possible failure, while a tight static seal between shaft and sealing lip must be assured when the shaft is stationary.
Leather is probably the oldest of the lip materials still in common use, but the move towards mass production methods has seen a massive increase in the development of synthetic rubbers which lend themselves to accurate and repeatable injection and compression moulding. Nitrile (NBR) is still by far the most common elastomer for “normal” use, whilst Viton® (FKM/FPM) is rapidly replacing Polyacrylate (ACM) and Silicone (VMQ) for high-temperature applications. Viton® also has high resistance to abrasion and chemical attack making it a preferred elastomer. Recent developments in the use of PTFE for Rotary shaft seals has caused widespread interest particularly for high-speed shaft rotation or poor lubrication applications.
Remove the cylinder head (See How to remove a cylinder head ), carefully peeling off the old gasket from the head or block. Make sure no dirt or carbon falls into the engine.

valve cover gasket assembly. The valve cover gasket assembly seals off the engine and prevents any unwanted contaminants from entering, thus ensuring the engine remains clean and well-maintained.
Choosing and using the proper sealing devices within oil and gas applications can be vital when preventing dirt, dust, water, and other debris from potentially getting inside and contaminating products.
Most effective sealing is obtained with optimum shaft surface finishes. The sealing efficiency is affected by the direction of the finish tool marks and the spiral lead. Best sealing results are obtained with polished or ground shafts with concentric (no spiral lead) finish marks. If you must use shafts with spiral finish leads, they should lead toward the fluid when the shaft rotates.