Egr Valves - Detroit Diesel MBE 4000 Service Manual

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1.20 EGR VALVES

The exhaust valves and valve specifications in the EGR engine have changed due to the addition
of valve stem sealing rings under the valve stem seals in the engine.
1.20.1
Perform the following steps in removing the valves from the EGR engine:
1. Follow the procedures for valve removal in a non-EGR engine until reaching the valve
stem seals removal step.Refer to section 1.19.5.
2. With the cylinder head in an upright position, remove and discard the valve stem seals and
valve stem sealing rings.See Figure 1-124.
1. Valve Stem Seal
2. Valve Stem Sealing Ring
Figure 1-124
NOTE:
The valve guide with valve stem sealing ring are used only in the EGR engines.
3. Check the following critical valve dimensions, and repair as necessary. See Figure 1-125
to determine the dimensions. Listed in Table 1-44 are the dimensions for the intake valve
and the differences between the exhaust non-EGR and exhaust EGR valves.
Valve stem diameter (A)
Valve seat diameter at the contact surface of the cylinder head (B)
Valve head diameter (C)
All information subject to change without notice.
6SE412 0403 Copyright © 2004 DETROIT DIESEL CORPORATION
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Valve Removal in the EGR Engine
Removing Valve Stem Seals and Valve Stem Sealing Rings
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3. Valve Guide
4. Cylinder Head
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MBE 4000 SERVICE MANUAL
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1-161
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