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Home >> GMC >> 1991 >> Value Van 7.4 N >> Repair and Diagnosis (Single Page) >> Engine Mechanical >> Mechanical >> 4.3L V6 - VIN [Z] >> Overhaul >> Valve Stem Oil Seals

Valve Stem Oil Seals

  1. Intake valve uses upper "O" ring seal and lower umbrella seal; exhaust valve uses upper "O" ring seal.
  2. When installing umbrella seal, seat the seal against valve guide boss on cylinder head. Coat upper "O" ring seal with engine oil before installation and ensure seal is not twisted when installed.
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