1. Damage of exhaust valve oil seal Result: When the exhaust valve is opened for exhaust, high-temperature exhaust gas will enter the cylinder head through the gap between the exhaust valve guide tube and the exhaust valve stem, resulting in rapid carbonization of the oil film between the exhaust valve guide tube and the exhaust valve stem, which will accelerate the wear of the exhaust valve guide tube and the exhaust valve. In severe cases, the exhaust valve is deformed and stuck in the conduit, resulting in air leakage in the cylinder, which does not work, the temperature of the crankcase rises, and the oil accelerates carbonization.
2. Damage result of intake valve oil seal: When the intake valve is opened for intake, the intake manifold is under negative pressure because the intake valve oil seal has been damaged and cannot be sealed. Due to the negative pressure in the intake manifold, the lubricating oil above the intake valve will be sucked into the cylinder for combustion. The more seriously the intake valve oil seal is worn, the faster the oil is sucked into the cylinder. When the oil quantity is insufficient, the moving parts of the engine (crankshaft, crankshaft pad, oil pump, camshaft, valve, timing chain, etc.). ).) will accelerate wear.
Therefore, if the valve oil seal is found to be worn (whether it is the intake valve oil seal or the exhaust valve oil seal), it must be replaced in time.
I hope the car boy's answer is helpful to you.
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