POWER CYLINDERS 229
Checking Counterbore Depth
Use one of the following methods to check the depth
of the crankcase counterbore:
Surface Gauge Method
NOTE: Clean counterbore surface and remove
existing shims if any before measuring counterbore
depth.
Figure 325 Checking counterbore depth with
surface gauge
1. Place the indicator tip of the surface gauge on the
crankcase. Zero the dial indicator.
2. Move the indicator tip onto the counterbore ledge.
Record the counterbore depth reading on the dial
indicator.
3. Take counterbore depth measurements at four
evenly spaced locations around the counterbore
ledge.
4. Compare the counterbore depth variation
between the four measurements with those
listedinspecifications (Table 32).
If the maximum variation between the four
measurements exceeds the specification,
resurface the counterbore.
Depth Micrometer Method
NOTE: Clean counterbore surface and remove
existing shims if any before measuring counterbore
depth.
Figure 326 Checking counterbore depth with
depth micrometer
1. Place a depth micrometer onto the counterbore
ledge. Record the counterbore depth reading.
2. Take counterbore depth measurements at four
evenly spaced locations around the counterbore
ledge.
3. Compare the counterbore depth variation
between the four measurements with
specifications.
If the maximum variation between the four
measurements exceeds the specification,
resurface the counterbore.
Checking Cylinder Sleeve Protrusion
CAUTION: To prevent engine damage, do not apply
holding adapters to the "fire dam" ridge of the cylinder
sleeve. Clamping forces should not be applied to this
ridge as internal cracking could develop adjacent to
the shim land.
EGES-265-2
Read all safety instructions in the "Safety Information" section of this manual before doing any procedures.
Follow all warnings, cautions, and notes.
© 2009 Navistar, Inc.
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