Detroit Diesel MBE 4000 Service Manual page 70

1.2 CYLINDER HEAD
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8. Attach the compression tester (J 6692–B or 000 589 17 21 00) to the test adaptor
(J 45392 or 904 589 01 21 00). Snap the fitting at the end of the tester onto the top of
the test adaptor. See Figure 1-13.
1. Fitting
2. Bolt
3. Hold-Down
Figure 1-13
Testing
1. Remove the electrical connectors from all unit pumps. When this is done, the engine
will not start.
2. For each cylinder, use the starter to crank the engine at least 8 engine revolutions. The
results will be recorded on the gauge of the tester.
3. Compare measurements on the chart with the values listed in Table 1-7. If the pressure
measured is below the minimum compression pressure or above the permissible
difference, determine the cause and correct the problem. To remove the cylinder head,
Refer to section 1.2.1.
Description
Minimum Compression Pressure Valve
Permissible Difference Between Individual Cylinders
Table 1-7 Compression Testing
1-22
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Testing Compression Pressure
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4. Constant Throttle Valve Cover
Pressure in kPa (psi)
2800 (406)
400 (58)
6SE412 0403 Copyright © 2004 DETROIT DIESEL CORPORATION
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All information subject to change without notice.
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