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I purchased a 2007 391 Meridian with qsb 380 5. 9 Cummins with 330 hours last July. On the initial sea trial the port turbo was found to be seized by the engine surveyor. I had the previous owner have the turbos rebuilt . It was done by the company that did the survey.
On the second sea trial both engines ran strong around 2850 wot. It has been running just as well a year later.
Last night I noticed soot on the turbo and coming from behind the exhaust elbow wrap. When I removed the wrap I found what I will post in the pictures. The exhaust wrap was covering the bolts and flange before I removed it. The starboard wrap came up short of the flange. It looks in good shape.
Is it possible for the mechanic to rebuild turbos without removing the flange?? If he did I’m assuming they would have definitely replaced with new bolts and washers.
I found on the Meridian forum that the 2006 models did not have enough pitch on the port exhaust. Allowing water to get to the turbos occasionally. The problem was supposedly fixed by 2007. I’m just wondering if I got one that slipped through the cracks. I’m reaching out to Meridian and the original dealer of the boat to see if they have any info. Probably will be tough considering they are not manufacturing them anymore.
I’m going to pull the elbow once I have heard from the mechanic who did the rebuild. I’m assuming the original issue that created the seized turbo has not been resolved.
I did find a small drop of antifreeze on the coolant hose clamp below the turbo. Couldn’t this have been creating the rust and soot if it was dissipating up behind the wrap?
I am new to Diesels and very appreciative of the wealth of knowledge on this site. Any input would be greatly appreciated. thanks, Daryl
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Vessel Name: Tenacious
Engines: 6BTA 5.9 330's - "Seaboard Style"
Location: Long Island, NY
Country: USA
That elbow is calling out for attention… You can see the clamps have been repositioned some time ago. I’d swap it out with a Centek FRP 90 which should also give the opportunity of cutting those hoses back a tad for some fresh material.
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Is that a “plumbing “style copper elbow on the outlet piping? . I know it does not get pressure but it seems a bit thin side for something to take a lot of salt water?
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Vessel Name: Tenacious
Engines: 6BTA 5.9 330's - "Seaboard Style"
Location: Long Island, NY
Country: USA
Like Tom requested, need overview pics showing the engines and exhaust in full. From what I can see you have a doomed wet riser that has or will fail internally giving your turbo gulps of seawater. A contributor to that rust can be the condensation because you have that hot dry intermediate section coming off the turbo that connects to the cold water fed jacketed section. The wrap will trap that moisture.
https://www.sbmar.com/articles/marine-exhaust-risers-that-are-doomed-to-fail/
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Likely reply here is to post more pictures further back allowing a better view of the entire setup along with a bit more history and nameplate of the engines that you have available. 2850 RPM at WOT is quite a bit short. I’m a previous owner of a vessel (2005 Sea Ray 390DA) that had QSB5.9 380’s for the power package. Re-propped twice to get it dialed into 3065 RPM at WOT, fully loaded vessel, and at about 93% engine load.
You will definitely get the right guidance here but need to supply some additional information.
Tom
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