Inspecting Valves; Refacing Valves; Valve Face - Navistar INTERNATIONAL DT 466 Service Manual

132
Figure 166 Pressing in the valve guide insert
1. Arbor press ram
2. Valve guide installation tool
3. Valve guide insert
3. Lubricate a new valve guide insert with clean
engine oil. Use the valve guide installation sleeve
to install the valve guide insert until the installation
sleeve bottoms out against the cylinder head.
NOTE: Do not ream the inside diameter of the valve
guide after installation.
provided in a finish reamed condition.
4. After installing the valve guide insert, debur the
valve guide by using the valve guide deburring
tool.

Inspecting Valves

1. Remove all carbon deposits from the valve stems
and valve heads.
2. Inspect each valve for burn marks, warpage,
scuffing and bending.
valves.
Read all safety instructions in the "Safety Information" section of this manual before doing any procedures.
CYLINDER HEAD AND VALVE TRAIN
Service valve guides are
Replace any damaged
EGES-265-2
Follow all warnings, cautions, and notes.
© 2009 Navistar, Inc.
Figure 167 Measuring valve stem diameter
1. Two measurements 90 degrees apart
2. Valve stem diameter measurement locations
3. To check for wear, use a micrometer to measure
the diameter of each valve stem.
4. Measure the valve stem diameter at two locations
that are approximately equidistant.
location, take two measurements that are 90
degrees apart. Average the two measurements
at each location and record the readings.
If the average of measurements at any of the
two locations exceed the valve stem diameter
specification, replace the valve.
5. Inspect the valve stem tip for scoring, pitting, or
signs of excessive wear.
6. Using the valve stem diameter and valve guide
inside diameter measurements, recorded earlier
(see "Inspecting Valve Guides") determine
valve stem-to-guide running clearance.
"Specifications". Replace the valve or valve
guides as required.
NOTE: Subtract the average valve stem diameter
from the average valve guide inner diameter
(determined earlier).
Valve Guide – Valve Stem = Running Clearance.

Refacing Valves

Valve Face

NOTE: If the valves are in serviceable condition, they
may be refaced to the specified angles, as required.
At each
See