B4000 SE Cab Plus 4WD V6-4.0L OHV (1997)
Valve Guide: Testing and Inspection
1. Measure each valve guide inner bore diameter and record.
Inner diameter: 8.71-8.74 mm (0.3433-0.3443 in)
2. Calculate the valve stem-to-guide clearance. With the valves in place, measure the clearance using Valve Stem Clearance Tool TOOL-6505-E, or
equivalent, and a dial indicator with a flat-end indicator point.
(1) Install the tool on the valve stem until it is fully seated and tighten the knurled set screw firmly. Permit the valve to drop away from its seat
until the tool contacts the upper surface of the valve guide.
(2) Position the dial indicator with its flat tip against the center portion of the tool's spherical section, at approximately 90— to the valve stem axis.
Move the tool back and forth in line with the indicator stem. Take a reading on the dial indicator without removing the tool from the valve
guide upper surface. (Divide the reading by two, the division factor for the tool.) If the valve stem-to-guide clearance exceeds the wear limit,
ream the valve guide for the next oversize valve stem.
Clearance
IN: 0.0200-0.0635 mm (0.0008-0.0025 in)
EX: 0.0457-0.0889 mm (0.0018-0.0035 in)
Service Limit Clearance Maximum: 0.1397 mm (0.0055 in)
