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Home >> GMC >> 2003 >> Yukon Denali >> Repair and Diagnosis >> External Pages >> Different car >> Section 521 (Engine Mechanical (Repair Instructions -- 2 Of 3) -- 4.8L, 5.3L & 6.0L) >> Repair Instructions (Off-Vehicle - Part 2) >> Engine Valley Cover Cleaning and Inspection

Engine Valley Cover Cleaning and Inspection

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    IMPORTANT:
    • Do not use the valley cover knock sensor oil seals again. Install NEW oil seals during assembly.
    • Do not use the valley cover gasket again. Install a NEW gasket during assembly.
  1. Remove the knock sensor oil seals (520) from the valley cover (555).
    2. Fig 1: View Of Knock Sensor Oil Seals & Valley Cover
    GM1277106Courtesy of GENERAL MOTORS CORP.
  2. Clean the valley cover in solvent.
    3. CAUTION: Refer to Safety Glasses Caution in Cautions and Notices.
  3. Dry the valley cover with compressed air.
  4. Inspect the gasket sealing surfaces for excessive scratches or gouging. Refer to Replacing Engine Gaskets .
  5. Inspect the valley cover oil seal bores for excessive scratches or gouging.
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