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Home >> GMC >> 1996 >> C3500 HD 7.4 J, Automatic >> Repair and Diagnosis >> External Pages >> Different car >> Section 148 (Engine Mechanical - 4.3L V6 - VIN W & ,X) >> Overhaul >> Cylinder Head >> Valve Stem Oil Seals

Valve Stem Oil Seals

WARNING: This page does not describe the selected car, but rather 24 other vehicles, including the 1997 Oldsmobile Bravada, 1997 GMC Sonoma, 1997 GMC Savana, 1997 GMC Safari, and 1997 GMC Pickup. However, it is still accessible from the selected car via links, so may be relevant.
  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 seal against valve guide boss on cylinder head. If equipped, coat upper "O" ring seal with engine oil before installation and ensure seal is not twisted when installed. A gap of .040-.080" (1-2 mm) must exist between edge of oil seal and valve guide. See Figure.
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