you should replace the oil filter during every scheduled oil change
Carefully remove the old air filter element
Reinstall the exhaust manifold
Install the new gasket or O-ring on the pump cover
whichever occurs first
Water Pump Impeller – Fits Johnson/Evinrude OMC 40 HP (Replaces 390286, 0390286, 777835, 0777835) 100HP you should replace the oilProduct Details This is a direct replacement Water Pump Impeller for Johnson Evinrude OMC 40 HP 2 stroke outboard engines. It is designed to fit models manufactured between 19741976, 19811987, and specifically a range of models from 19831986, ensuring reliable cooling performance. This part serves as a direct interchange for OEM numbers 390286, 0390286, 777835, and 0777835, and aftermarket references including Sierra 18 3366, CEF 500353, Mallory 9