Valve - Guide Inner Diameter

WARNING: This page is about a different car, the 2003 Mercury Marauder, 2003 Mercury Grand Marquis, and 2003 Ford Crown Victoria. However, it is still accessible from the selected car via links, so may be relevant.

Measure the inner diameter of the valve guides in two directions where indicated.
- Refer to ENGINE 4.6L 2V or ENGINE 4.6L 4V .
  
  Fig 1: Measuring Inner Diameter Of Valve Guides In Two Directions
  Courtesy of FORD MOTOR CO.
If the valve guide is not within specifications, ream the valve guide and install a valve with an oversize stem or remove the valve guide and install a new valve guide.