F 250 4WD Super Duty V8-6.4L DSL Turbo (2008)
Valve Guide: Service and Repair
Valve Guide Inner Diameter
1. Measure each valve guide by using a small hole gauge and a 0-25 mm (0-1 inch) outside micrometer. Record each valve guide inner diameter so
valve-to-guide running clearance may be determined. If valve guide inner diameter exceeds specifications, install a new cylinder head.
2. Using the valve guide inside diameter and the valve stem diameter measurements, determine valve stem-to-guide running clearance, install new
valves as required.
