Obstruction Or Damage To Breather System - Detroit Diesel MBE 4000 DDEC VI Troubleshooting Manual

7.1

OBSTRUCTION OR DAMAGE TO BREATHER SYSTEM

To determine if an obstructed or damaged breather is causing excessive crankcase pressure,
perform a crankcase pressure test. Refer to section 7.1.1
7.1.1 Crankcase Pressure Test
Perform the following steps to check the engine crankcase pressure:
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.
1. Start the engine.
2. Run the engine and bring the engine coolant temperature to normal operating range,
approximately 88-96°C (190-205°F).
3. Return engine to idle and remove the oil dipstick.
4. Attach a manometer calibrated to read pressure in kPa or inches of (H
dipstick opening.
5. Run the vehicle to rated speed.
6. Measure and record crankcase pressure.
7. Shut down the engine.
8. Remove the manometer from the oil dipstick opening and install the dipstick.
9. If the engine crankcase pressure is greater than 2.0 kPa (8.0 in. H
10. If the crankcase pressure remained the same, check the air compressor; refer to section 7.2
7.1.2 Breather System Resolution
Perform the following steps for breather system resolution:
1. Remove the breather from the rear flywheel cover; refer to ???????
2.
3. Verify the crankcase pressure; refer to section 7.1.1.
7.1.2.1 Test Engine with Breather Removed
Perform the following steps to determine if the removed breather element resolved the excessive
crankcase pressure.
All information subject to change without notice.
6SE568 Copyright © PRELIMINARY 2007 DETROIT DIESEL CORPORATION
PERSONAL INJURY
(Rev. )
MBE 4000 DDEC VI TROUBLESHOOTING GUIDE
O), refer to section 7.1.2
2
O), to the oil
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