Sierra Classic 2500 4WD V8-8.1L (2007)
9. Remove the engine front cover bolts (2).
10. Remove the engine front cover (1).
Important: The engine front cover gasket is reusable.
11. Remove the engine front cover gasket.
12. Remove the crankshaft front oil seal from the front cover.
Installation Procedure
1. Install a NEW crankshaft front oil seal using J 42851.
2. Lubricate the sealing surface of the crankshaft front oil seal with clean engine oil.
Important: The engine front cover must be installed and the fasteners tightened while the sealant is still wet to the touch.
3. Apply sealant in 2 places (1) on the engine block where the front cover meets the oil pan. Refer to Sealers, Adhesives, and Lubricants for the
correct part number.
