Driver Side Valve Cover For Chevy Silverado Tahoe For Gmc Sierra Yukon 12570427

Fitment:for Cadillac CTS 2004-2007for Cadillac Escalade ESV 2003-2008for Chevrolet Camaro 1999-2002for GMC Sierra 1500 1999-2008for GMC Sierra 3500 2001-2006Specification: Replace Number: 12570427, 12561820 Size: 49.5x11x4.4cm / 19.49"x4.33"x1.73"(L*W*H) Package Included: 1 Pcs Valve Cover with Gasket Operational step, requirements and key points 1. Cleaning: Thoroughly clean the cylinder head mating surfaces and the inside of the valve cover using a carbide cleaner, ensuring they are absolutely clean, dry, and free of dust. 2. Inspection: Inspect the valve cover for deformation or cracks; gaskets must be replaced with brand new ones. Check the bolt threads are intact. 3. Place the Gasket: Place the new gasket flat into the sealing groove of the valve cover, ensuring it is fully seated and without twisting. 4. Tightening the Bolts: A torque wrench must be used. Tighten to the specified torque value in 2-3 steps, following the sequence specified in the manual (usually from the center outwards in a crisscross pattern). 5. Post-installation inspection If sealant was applied after installation, wait for it to fully cure (usually ≥1 hour) before starting. After starting, run the machine to normal operating temperature, carefully check for oil leaks around the edges, and conduct a road test followed by a final check. Installation Key Points: 1. It is recommended to seek installation from a professional repair technician. 2. Unless required by the service manual, do not apply sealant to the rubber gaskets. If sealant is necessary, apply it only to the cylinder head mating surfaces.“concave corner"Apply a small amount of the specified sealant evenly to the area.