Mercury E9AZ-9F715-B Throttle Valve Assembly

Before installing a new O-ring, you should clean the sealing surface and bore of the throttle body assembly. Then, lubricate the new O-ring with engine oil, securely tighten the screws, and reconnect the electrical connector to the BPA-ISC valve assembly. Additionally, ensure that the O-ring is properly seated in its groove to prevent leaks, and double-check that all components are free of debris or damage before reassembly. This will help ensure a proper seal and optimal performance of the throttle body.