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What are the causes of poor valve sealing?

1 Answers

SanDakota

07/29/25 3:39pm

Engine valve sealing issues can be caused by insufficient valve clearance, excessive carbon buildup on the valve contact surface, deformation of the valve seat, deformation of the valve head, valve spring failure, or rocker arm deformation. Additional details include: 1. Regular oil and oil filter changes: As oil passes through the fine pores of the oil filter, solid particles and viscous substances in the oil are trapped in the filter. If the filter becomes clogged, oil cannot flow smoothly through it, potentially rupturing the filter or forcing open the safety valve, allowing contaminants to bypass and return to the lubrication system. This accelerates engine wear and increases internal contamination. 2. Maintaining proper crankcase ventilation: Airborne contaminants can accumulate around the PCV valve, potentially clogging it. A clogged PCV valve can cause polluted gases to flow backward into the air filter, contaminating the filter element and reducing its filtration efficiency. This leads to dirtier air-fuel mixture intake, further polluting the crankcase, increasing fuel consumption and engine wear, and potentially causing engine damage. Therefore, regular PCV system maintenance is essential to remove contaminants around the PCV valve.

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