Detroit Diesel MBE 4000 Service Manual page 63

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5. Inspect the contact surface (bottom face) of the cylinder head for warpage, both lengthwise
and diagonally. See Figure 1-8. If the gap is larger than 0.015 mm (0.0006 inch), machine
the cylinder head.
1. Contact Surface
Figure 1-8
[a] Place a straightedge lengthwise across the cylinder head contact surface (bottom
face).
[b] If there is a gap between the lower edge of the straightedge and the contact surface
of the cylinder head that is large enough to let light through, insert a feeler gauge
into the gap.
[c] Measure the amount of warpage with the feeler gauge and compare it to the value
listed in Table 1-6. If the gap is larger than 0.015 mm (0.0006 in.), machine the
cylinder head.
What To Measure
Maximum Permissible Warpage of
Head Mating Surface
Maximum Permissible Parallelism
Deviation of Head Mating Surface
Overall Height of Cylinder Head
Table 1-6
All information subject to change without notice.
6SE412 0403 Copyright © 2004 DETROIT DIESEL CORPORATION
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Measuring Cylinder Head Warpage
How To Measure
Lengthwise and Diagonally
At Each of the Four Corners
When New
After Machining
Cylinder Head Specifications
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MBE 4000 SERVICE MANUAL
2. Straightedge
mm (inch)
0.015 (0.0006)
0.1 (0.004)
113.85-114.15 (4.482-4.494)
113.5 (4.46)
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1-15
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