Help diagnose a sound?

69fastback69fastback Member Posts: 948 ✭✭✭
I've been looking for the cause of this for a few years. It's very intermittent, and only happens on start up. After the engine has been running for 10-15 seconds it stops, and it only does it at idle, but it'll make the noise regardless of in gear, or out of gear. When we were out yesterday it only did it once, but sometimes it'll do numerous times. It's random and intermittent. The noise is coming from the rear of the engine, ie....not a belt or idler pulley. It's been happening for a few years, and since I've first heard the noise, both the entire transom assembly, and outdrive have been replaced, and it's still here. So basically, everything behind the motor is new, and it was doing it before all that was replaced. Any ideas?

https://m.youtube.com/watch?v=EfDamwbIQgc

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