Loctite SI 5900 Black RTV Silicone

1. Clean and dry the surfaces. Remove all old gasket material, oil, and grease from both mating flanges using a plastic scraper and a solvent cleaner (such as isopropyl alcohol). Let the surfaces dry completely before applying sealant. 2. Prepare the nozzle. Cut the plastic nozzle tip at a 45-degree angle to match your required bead diameter (typically 1 mm to 3 mm, or up to 6 mm for larger gaps). 3. Apply a continuous bead. Extrude an unbroken, uniform bead of LOCTITE SI 5900 onto one flange surface. Encircle all bolt holes completely to stop oil from wicking past the fasteners. 4. Assemble immediately. Press the mating cover or flange into place within 5 to 10 minutes (well before the ~15-minute skin-over time). Avoid sliding the parts once they touch so you do not smear the bead. 5. Tighten fasteners. Torque the bolts evenly to the manufacturer’s specifications. Do not over-tighten to the point that all the silicone squeezes out of the joint. 6. Wipe excess and cure. Wipe away any squeezed-out silicone immediately with a dry cloth. Allow at least 24 hours for full cure before adding oil or exposing the joint to operating pressure (LOCTITE SI 5900 does tolerate immediate low-pressure factory leak checks).