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- 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.
Figure 6: Recommended housing bore chamfers (shouldered bore)
3. Dust and debris are common reasons for oil seal failure.
Carefully lift off the cover. If it sticks, gently tap it sideways with a soft-faced rawhide or nylon hammer, or with the heel of your hand.