Section 8.4 Worn or Damaged Valve or Cylinder Kit

Section 8.4
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 MBE 900 Service Manual (6SE9007), special equipment chapter.
    warning

    PERSONAL INJURY

    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 70-95°C (158-203°F).
  5. Run the vehicle to full load and rated speed.
  6. Attach a manometer calibrated to read pressure kPa or inches of H2 O, to the oil dipstick opening.
  7. Measure and record crankcase pressure. Refer to "2.1 Crankcase Pressure Test" .
  8. Shut down the engine.
  9. Remove the vehicle from the chassis dynamometer.
  10. Review the crankcase pressure test.
    1. If the crankcase pressure is greater than 0.62 kPa (2.5 in. H 2 O), go to step 11 .
    2. If the crankcase pressure is less than 0.62 kPa (2.5 in. H 2 O), no further troubleshooting is required.
  11. Perform the cylinder compression test, refer to "2.2 Compression Pressure Test" .
    1. If cylinder pressure is below specifications, as listed in Table "Compression Testing" ,refer to "8.4.1 Worn or Damaged Valve or Cylinder Kit Repair" .
    2. If cylinder pressure is within specifications, call Detroit Diesel Customer Support Center at 313-592-5800.

Section 8.4.1
Worn or Damaged Valve or Cylinder Kit Repair

Perform the following steps for a worn or damaged valve or cylinder kit:‪

  1. Remove the cylinder head; refer to MBE 900 Service Manual (6SE9007), engine chapter.
  2. Inspect the cylinder head for worn or damaged valves; refer to MBE 900 Service Manual (6SE9007), engine chapter.
  3. Inspect the cylinder kit components for worn or damaged liners, piston or piston rings; refer to MBE 900 Service Manual (6SE9007), engine chapter.
  4. Verify repair to cylinder valve(s) or cylinder kit components; refer to MBE 900 Service Manual (6SE9007), engine chapter.
Section 8.4.1.1
Test Engine with Repairs Made to Correct Worn or Damaged Valve or Cylinder Kit

Perform the following to determine if the repaired valve or cylinder kit resolved the excessive crankcase pressure:‪

  1. Move the vehicle requiring test to the chassis dynamometer; refer to OEM guidelines.
  2. Disconnect air compressor; refer to MBE 900 Service Manual (6SE9007), special equipment chapter.
    warning

    PERSONAL INJURY

    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 70-95°C (158-203°F).
  5. Run the vehicle to full load and rated speed.
  6. Attach a manometer calibrated to read pressure in kPa or inches of H2 O, to the oil dipstick opening.
  7. Measure and record crankcase pressure. Refer to "2.1 Crankcase Pressure Test" .
  8. Shut down the engine.
  9. Remove the vehicle from the chassis dynamometer.
  10. Compare the cylinder pressure test results to specifications listed in Table "Compression Testing" .
    1. If cylinder pressure is within specifications, no further troubleshooting is required.
    2. If cylinder pressure is not within specifications, call Detroit Diesel Customer Support Center at 313-592-5800.


EPA07 MBE 900 DDEC VI Troubleshooting Guide - 6SE580
Generated on 10-13-2008

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