2000-01 CYLINDER HEAD OVERHAUL 4.6L V8 – VIN W & 6
Check cylinder head for cracks or damage. If maximum warpage exceeds .004″ (.10 mm), replace cylinder head.
Inspect valve spring free length, out-of-square and pressure. Replace valve spring if not as specified. See VALVES & VALVE SPRINGS table under ENGINE SPECIFICATIONS.
Valve Stem Oil Seals
Use Seal Installer (T91T-6571-A) to install oil seals.
1. Valve guides may be reamed for oversize valves if stem-to-guide oil clearance exceeds specification. See CYLINDER HEAD table under ENGINE SPECIFICATIONS. Valves are available in .015″ (.38 mm) and .030″ (.76 mm) oversize.
2. Valve guides may also be bored out and replaced with a service guide if oversize valves are not available or guide is damaged. Ream valve guides until proper stem-to-guide clearance exists.
Ensure valve seat angle, seat width and seat runout are within specification. See CYLINDER HEAD table under ENGINE SPECIFICATIONS. Valve seats must be ground when valve guide is reamed or replaced. Replacement information is not available.
Ensure head diameter, stem diameter, valve face runout and valve margin are within specification. See VALVES & VALVE SPRINGS table under ENGINE SPECIFICATIONS.
Valve Seat Correction Angles
If seat width is too wide after grinding seat, use a 60-degree stone to remove stock from bottom of valve seat (raise seat) or a 30-degree stone to remove stock from top of seat (lower seat).