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Home >> GMC >> 2021 >> Yukon XL AT4 >> Repair and Diagnosis >> Engine Mechanical >> Mechanical >> Engine Mechanical - 5.3L (L84) Or 6.2L (L87) - Repair Instructions ( 2 Of 12) >> Repair Instructions >> Engine Block Overhaul >> Cleaning and Inspection Procedure - Conditional

Cleaning and Inspection Procedure - Conditional

    WARNING:

    Refer to Safety Glasses Warning .

  1. GM3270307Courtesy of GENERAL MOTORS COMPANY

    Inspect the camshaft position actuator solenoid valve for the following conditions:

    • Dirt, debris, or restrictions within the oil passages (1)
    • Damaged threads (2)

      If the threads of the valve are damaged, also inspect the threads in the front of the camshaft for damage.

    • Dirt, debris, or restrictions within the oil inlet (3)

      If debris is detected, the engine assembly should be inspected to determine the source of contamination.

  2. GM3270308Courtesy of GENERAL MOTORS COMPANY

    Inspect for a sticking valve spool or broken valve spool spring.

  3. Depress the valve spool into the housing. The valve should move freely with no binding or sticking and minimal resistance inward. When released, the valve spring should return the spool to the proper extended position (1) of 6.52 - 6.92 mm (0.257 - 0.272 in).