I have a 2005 225 HP ETEC with about 700 hours. I had a cracked lower unit house that was replaced and while running the boat for the first time I got a no oil alarm. I shut the engine down and got towed back to the ramp. I took it back to the shop and there was a crack in the oil filter.
Since then when I start the engine I get a faint alarm that is barely audiable. If you didn't know what to listen for, you might not even make it out. Eventually after running for 20 or 30 minutes the alarm will go away.
Any ideas what might be causing this, or how I can fix it?
Disconnect the oil tank wiring at the engine to see if the sound disappears,
"There is never just one thing wrong with a boat";
-- Travis McGee, main character in a book series by John D. McDonald
The factory recommends that a properly trained technician service your Johnson or Evinrude outboard motor. Should you elect to perform repairs yourself, use caution, common sense, and observe safety procedures in the vicinity of flammable liquids, around moving parts, near high-temperature components, and working with electrical or ignition systems.
The information offered here is only general in nature and should not be construed as complete factory approved procedures, techniques, or specifications. Always use the proper service manual for your motor, up-to-date service literature, the correct tools, and have an understanding of how to proceed with troubleshooting and repair methods. If you are unsure or uncomfortable with a procedure, a situation, or a technique, enlist the services of a factory trained technician.