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Home >> GMC >> 1998 >> C3500 HD 6.5 F, Automatic >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 1 (Engine Mechanical - 4.3L V6, 5.0L, 5.7L & 7.4L V8 - VINS [W,X,M,R,J]) >> Overhaul >> Cylinder Head >> Valve Stem Oil Seals

Valve Stem Oil Seals

WARNING: This page is about a different variant/trim than selected.

On 4.3L, intake valve uses upper "O" ring seal and lower umbrella seal; exhaust valve uses upper "O" ring seal. On 5.0L and 5.7L, intake and exhaust valves use upper "O" ring seal and lower umbrella seal. On 7.4L, intake and exhaust valves use lower umbrella seal. 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.04-.08" (1-2 mm) must exist between edge of oil seal and valve guide. See Figure.

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