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  1. JM390

    OFFICIAL 390/40 Motor Yacht Thread

    Has anyone replaced their exhaust elbows and risers with dry exhaust elbows and if so do you have your old ones and who did you use to do the work?
  2. JM390

    OFFICIAL 390/40 Motor Yacht Thread

    Thanks but big difference imho. Both nice boats but looking for a 390 with diesels.
  3. JM390

    OFFICIAL 390/40 Motor Yacht Thread

    Anyone know of any 390 MY for sale on east coast from VA north ? Diesels
  4. JM390

    Cummins 480 CE Code

    Or do you mean setting rack?
  5. JM390

    Cummins 480 CE Code

    Top end of what ? Valve train ?
  6. JM390

    Cummins 480 CE Code

    Has anyone seen this code before ? Engine sometimes starts. Sometimes doesn’t. Once it does runs perfect
  7. JM390

    OFFICIAL 390/40 Motor Yacht Thread

    That model was discontinued. The replacement model is 121-NR740SS depending which finish you want. That is stainless.
  8. JM390

    OFFICIAL 390/40 Motor Yacht Thread

    I probably could have gotten away with replacing all pistons and reusing existing block but I opted for a new long block for 2 reasons. One who knows where that metal that broke off ended up... and 2 buy buying a complete assembled long block that portion will carry Cummins 2yr 2000 hour...
  9. JM390

    OFFICIAL 390/40 Motor Yacht Thread

    Wow amazing. These guys must have been done this before. Wonder how they got to the outboard side of the oil pan bolts. Tight space to work with in there to start. I cant imagine how they had enough height to lift pistons out of there once engine was lifted. I am impressed.
  10. JM390

    OFFICIAL 390/40 Motor Yacht Thread

    On mine they removed the port salon couch, removed carpet around that area and then removed the factory hatch under the carpet. I was pretty impressed to Sea Ray Engineers actually designed a factory enclosed hatch that when removed allows for complete removal of the engine. Once they removed...
  11. JM390

    OFFICIAL 390/40 Motor Yacht Thread

    Nice to see things moving forward. I am very interested to see they are able to do this without lifiting engine out. Did they even remove the floor panels? On mine we have the motor completely out of the boat. New long block supposed to start going in later this week then reassembly happens. I...
  12. JM390

    40 sedan bridge forum

    I placed an order with Taylor made for this the other day. They are currently closed until this Covid thing passes but they do have it when they do re open.
  13. JM390

    ordered Presta Gel Coat

  14. JM390

    ordered Presta Gel Coat

    I compounded one side of my boat today with Presta Gel Coat after I washed and degreased it. Then finished it off with Collinite 925. Came out great. I had some light oxidation and little hazing here and there. Normal amount for a whole season before compounding. The presta is not too agressive...
  15. JM390

    OFFICIAL 390/40 Motor Yacht Thread

    I was referring to the 390/40 Motoryacht since this thread was for that but either way Sundancer is also a great model as well and has similar power packages. I have heard of them coming with Cummins 450 diamonds and the 6.7 QSB 380. Sounds like thats what you are looking at. I do not know as...
  16. JM390

    OFFICIAL 390/40 Motor Yacht Thread

    So here’s my 2 cents. The 390/40 is a great boat all around. Great looks, well built and has many features and designs that are way ahead of its time. The 480 CE engines are iron work horses so long as you have the upgraded heads and propped properly. That is really there only fault. Each Diesel...
  17. JM390

    MAG 350 MPI (2002) On going issue help please.

    Sounds like bad fuel pump. But get a tech with Rhindas if your motor has smart craft and they can run a series of tests to rule out fuel pump, injectors and or bad sensors. If its getting the fuel but not the spark usually would be indication of bad cap but you said you did that. Go after fuel...
  18. JM390

    OFFICIAL 390/40 Motor Yacht Thread

    They just started making progress on mine as well and hopefully don’t get halted now with all non essential businesses getting shut down ....
  19. JM390

    OFFICIAL 390/40 Motor Yacht Thread

    how much is this costing you all in? Did they leave everything in tact and working through the single engine hatch ?
  20. JM390

    OFFICIAL 390/40 Motor Yacht Thread

    anyone know sizes ? Diesel 2 inch shafts? TRim tabs R2 zincs?
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