Expedition 4WD V8-5.4L VIN 5 (2006)
Valve: Service and Repair
Valve-Stem Diameter
1. Measure the diameter of each intake and exhaust valve stem at the points shown. Verify the diameter is within specification.
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If out of specification, install new components as necessary.
Valve-Inspection
1. Inspect the following valve areas:
1. the end of the stem for grooves or scoring
2. the valve face and the edge for pits, grooves or scores
3. the valve head for signs of burning, erosion, warpage and cracking
4. the valve margin for wear
Valve-Seat Inspection
Valve and Seat Refacing Measurements
CAUTION: After grinding valves or valve seats, check valve clearance.
1. Check the valve head and seat.
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Check valve angles.
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Check margin width.
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Be sure margin width is within specification.
2. Inspect for abnormalities on the valve face and seat.
