Worn Or Damaged Valve(S) Or Cylinder Kit(S) Repair - Detroit Diesel EPA07 Series 60 DDEC VI Troubleshooting Manual

6.5 WORN OR DAMAGED VALVE OR CYLINDER KIT
A loss of cylinder pressure can cause increased oil consumption. The detection and elimination of
cylinder pressure losses is vital to engine life and efficient operation. To assist the mechanic in
effectively measuring the loss of cylinder pressure, and locating the source of abnormal leaks in
individual cylinders, the following test procedure has been developed.
1. Move the vehicle requiring test to the chassis dynamometer; refer to OEM guidelines.
2. Disconnect air compressor, refer to appropriate service manual, special equipment chapter.
3. Start the engine.
4. Run the engine and bring the engine coolant temperature to normal operating range.
5. Run vehicle to full load and rated speed.
6. Attach a manometer calibrated to read in inches of water, to the oil dipstick opening.
Measure and record the crankcase pressure.
7. Shut down engine.
8. Remove the vehicle from the chassis dynamometer.
9. Review the crankcase pressure test results.
[a] If the crankcase pressure exceeds 1.25 kPa (5 in. H
valve(s) or cylinder kit; refer to section 6.5.1.
[b] If the crankcase pressure was less than or equal to 1.25 kPa (5 in. H
cylinder compression test.Refer to section 6.5.1.2.
10. Compare the cylinder compression test results to specifications.
[a] If the cylinder compression is below specifications, repair worn or damaged valve(s)
or cylinder kit; refer to section 6.5.1.
[b] If the cylinder compression is within specification, call Detroit Diesel Customer
Support Center (313-592-5800).
6.5.1

Worn or Damaged Valve(s) or Cylinder Kit(s) Repair

Perform the following steps to repair worn or damaged valve(s) and cylinder kit(s):
1. Remove cylinder head; refer to appropriate service manual, engine chapter.
2. Inspect the cylinder head for worn or damaged valves; refer to appropriate service manual,
engine chapter.
3. Inspect the cylinder kit components for worn or damaged liners, pistons or piston rings;
refer to appropriate service manual, engine chapter.
4. Replace damaged cylinder kit components; refer to appropriate service manual, engine
chapter.
5. Verify repairs made to cylinder head valve(s) or cylinder kit components; refer to section
6.5.1.1.
All information subject to change without notice.
Copyright © 2007 DETROIT DIESEL CORPORATION
SERIES 60 DDEC VI TROUBLESHOOTING GUIDE
O), repair worn or damaged
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O), perform
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