Worn Or Damaged Valve Or Cylinder Kit - Detroit Diesel MBE 4000 DDEC VI Troubleshooting Manual

7.4

WORN OR DAMAGED VALVE OR CYLINDER KIT

7.4

WORN OR DAMAGED VALVE OR CYLINDER KIT

To determine if a worn or damaged cylinder kit is causing excessive crankcase pressure, perform
the following:
1. Move the vehicle requiring test to the chassis dynamometer; refer to OEM guidelines.
2. Remove air compressor; refer to the MBE 4000 Service Manual (6SE420, Air Intake
System Chapter.
To avoid injury before starting and running the engine,
ensure the vehicle is parked on a level surface, parking
brake is set, and the wheels are blocked.
3. Start the engine.
4. Run the engine and bring the engine coolant temperature to normal operating range,
approximately 88-96°C (190-205°F).
5. Run the vehicle to full load and rated speed.
6. Attach a manometer calibrated to read pressure kPa or inches of H
opening.
7. Measure and record crankcase pressure.
8. Shut down the engine.
9. Remove the vehicle from the chassis dynamometer.
10. Review the crankcase pressure test.
[a] If the crankcase pressure is greater than 2.0 kPa (8.0 in. H
[b] If the crankcase pressure is less than 2.0 kPa (8.0 in. H
is required.
11. Perform the cylinder compression test, Refer to section 7.4.1
[a] If cylinder pressure is below specifications, Refer to section 7.4.2.
[b] If cylinder pressure is within specifications, call Detroit Diesel Customer Support
Center at 313-592-5800.
7.4.1 Compression Testing
Perform the following steps to compression test the engine:
7-8
PERSONAL INJURY
6SE568 Copyright © PRELIMINARY 2007 DETROIT DIESEL CORPORATION
O, to the oil dipstick
2
O), go to step 11.
2
O), no further troubleshooting
2
(Rev. ) All information subject to change without notice.