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SERIES 638 OIL PRESSURE VALVE

Oil is directed through an oil pressure valve to the full-flow filter and through appropriate oil passages machined in the crankcase to the main bearing carriers, camshaft bearings, and to the turbocharger. ‪

Replacement of Oil Pressure Valve

To determine if replacement of the oil pressure valve is necessary, perform the following procedure. See Figure 28583 . ‪

Flowchart for Replacement of Oil Pressure Valve

Replacement of Oil Pressure Valve

Replace the oil pressure valve as follows: ‪

  1. Drain the lubricating oil from the crankcase. Refer to section .
  2. Remove the oil pan. Refer to section .
  3. Remove snap ring from cylinder block. See Figure 28454 .

    1.Retaining Clip ‪

    3.Spring ‪

    2.Relief Valve Cap ‪

    4.Plunger ‪

    Removal of Oil Pressure Valve

  4. Remove the oil pressure valve assembly from the cylinder block.

Cleaning of Oil Pressure Valve

Clean the oil pressure valve as follows: ‪

  1. Clean the oil pressure valve and related parts with clean fuel oil.

    To avoid personal injury when blow drying, wear adequate eye protection (safety glasses or face plate) and do not exceed 276 kPa (40 lb/in. 2 ) air pressure. ‪

  2. Dry the oil pressure valve and related parts with compressed air.
Inspection of Oil Pressure Valve

Inspect the oil pressure valve as follows: ‪

  1. Visually check the oil pressure valve for clogging.
    1. If the oil pressure valve is clogged, clean as necessary. Refer to section .
    2. If the oil pressure valve is not clogged, proceed with step of inspection.
  2. Visually check the oil pressure valve spring for cracks or physical damage.
    1. If the oil pressure valve spring has been cracked or physically damaged, replace the assembly. Refer to section .
    2. If the oil pressure valve spring has not been cracked or physically damaged, proceed with step of inspection.
  3. Visually check the oil pressure valve casing for cracks or physical damage.
    1. If the oil pressure valve casing has been cracked or physically damaged, replace the assembly. Refer to section .
    2. If the oil pressure valve casing has not been cracked or physically damaged, reuse the assembly. Refer to section .

Installation of Oil Pressure Valve

Install the oil pressure valve as follows: ‪

  1. Install oil pressure valve assembly into the cylinder block.

    To avoid personal injury when removing the snap ring, wear adequate eye protection (face plate or safety glasses). The snap ring is under spring tension. ‪

  2. Install the snap ring using snap ring pliers.
  3. Install the oil pan. Refer to section .
  4. Refill the crankcase with lubricating oil. Refer to section .
  5. Run engine to verify repair.