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SERIES 50 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. Disconnect air compressor; refer to Section .
  3. Start the engine.
  4. Run the engine and bring the engine coolant temperature to normal operating range.
  5. Run the vehicle to full load and rated speed.
  6. Attach a manometer, refer to Section , calibrated to read in inches of water, to the oil dipstick 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.
    1. If the crankcase pressure was greater than 3 in. H2 O (0.75 kPa); refer to Section .
    2. If the crankcase pressure was less than 3 in. H2 O (0.75 kPa); perform a cylinder compression test; refer to Section .
  11. Compare the cylinder compression test results to specifications.
    1. If cylinder pressure is below specifications, (listed in Table , refer to Section ); refer to Section .
    2. If cylinder pressure is within specifications, (listed in Table , refer to Section ), call Detroit Diesel Technical Service Group.

Worn or Damaged Valve or Cylinder Kit Repair

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

  1. Remove the cylinder head; refer to Section .
  2. Inspect the cylinder head for worn or damaged valves; refer to Section .
  3. Inspect for worn or damaged cylinder kit components:
    1. Inspect cylinder liner for damage, refer to Section .
    2. Inspect piston and piston rings for damage, refer to Section .
  4. Verify repair to cylinder valve(s) or cylinder kit components; refer to Section .
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 Section .
  3. Start the engine.
  4. Run the engine and bring the engine coolant temperature to normal operating range.
  5. Run the vehicle to full load and rated speed.
  6. Attach a manometer, refer to Section , calibrated to read in inches of water, to the oil dipstick opening.
  7. Measure and record crankcase pressure.
  8. Shut down the engine.
  9. Remove the vehicle from the chassis dynamometer.
  10. Compare the cylinder pressure test results to specifications.
    1. If cylinder pressure is within specifications, (listed in Table , refer to Section ), no further troubleshooting is required.
    2. If cylinder pressure is not within specifications, (listed in Table , refer to Section ), call Detroit Diesel Technical Service Group.