Anybody recognize this high sound?

Marc Rainaldo

Active Member
Apr 18, 2019
260
Netherlands
Boat Info
Sea Ray 500 DA 1994
Engines
Detroit diesel 6v92
Hello all,

Past augustus we made our first action in our new 500da.
We did a test trip to see how our boat goes in plane.
On start we had some black smoke but that disappeared very fast (dirt in turbo).
We heard on high rpm a high sound.

After this trip we did some trips on low rpm with no problems. The way the diesels run on low rpm is perfect and the engine sound is very good.
We faced many other problems (non engine) on our ship that had to be fixed first so didn’t payed much attention to the engines yet.

Now the time has almost come to do some maintenance on the 6v92 Detroit diesels. This is my first boat with diesels so I still have to learn a lot.
Maybe the high sound is a turbocharger sound, I don’t know yet because the turbochargers on the Detroit’s are the first turbos I ever experience.

From that test trip we made a video, I hope someone recognize the sound.


For the maintenance my plan is to start by changing oil, impeller and all filters.
Learn, listening and measure from there.
 
When we first visit our boat at the previous owner we couldn’t go in plane because to much dirt on the bottom. The previous owner guaranteed us that it would go plane when bottom was cleaned.
In my past experience tuning up engines in our previous boats I recognize a good running engine. And when I heard the engines running I was happy.

The turbos I didn’t hear at that point. So a bit of a gamble buying this ship without do a proper test on high speed.

We also made a video at that point and at home I listened and listened, and even that we only went slow the sound was really awesome, especially when you listen on a good sound system. So we put a couple extra things in the contract about ship in plane and after bottom cleaning it went very Smooth and fast in plane.

So for those who love the sound of Detroit’s here another video

 
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