Frontier XE King Cab 4WD L4-2.4L (KA24DE) (1998)
b. Remove retainer plates while holding spring.
c. Place mating surface of valve facedown, and remove internal parts.
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If a valve is hard to remove, lightly tap valve body with a soft hammer.
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Be careful not to drop or damage valves, sleeves, etc.
Valve Springs Inspection
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Measure free length and outer diameter of each valve spring. Also check for damage or deformation.