5.0L EFI new exhaust manifolds + spacers + risers

Discussion in 'Sport Boats' started by GoFastr, Oct 17, 2017.

  1. GoFastr

    GoFastr Cool Runnings GOLD Sponsor

    148
    Jan 20, 2016
    Cayman Islands
    2003 Sea Ray 270 SunDeck MX 6.2L MPI w/Bravo III
    Tow: 2012 Ford F150 Raptor SVT
    Mercruiser MX 6.2L MPI w/Bravo III
    I never noticed an overheating problem before but when running the boat on hose muffs in the yard before going out I saw water coming from the drain plug and wondered why water was coming out of the boat when it had been kept covered and hadn't been in the water for a month. I investigated and found the leak to be a hairline crack in the exhaust manifold by the elbow that the hose connects to. It seemed that when it got hot it would expand and open up causing a leak inside the boat. Lucky I caught it before going out to sea!

    So I just recently purchased new exhaust for my 1998 Sea Ray 210 Sundeck with 5.0L EFI and Alpha One Gen 2 sterndrive.

    I also purchased all new hoses that carry water including a new thermostat and the impeller kit for the sterndrive. I am determined not to have any cooling issues.

    My boat is wet style exhaust, raw water cooled with no heat exchanger.

    My question is, which gaskets do I use between the top and bottom of the 3" spacers?

    Riser elbow
    |
    Gasket (Restrictor type -OR- Open?)
    |
    3" spacer
    |
    Gasket (Restrictor type -OR- Open?)
    |
    Exhaust manifold

    My parts came with a variety of gasket types and configurations and I'm not sure which ones to use where for my very hot and humid tropical climate. I never have to winterize my boat.

    Thanks in advance!
     

    Attached Files:

  2. Sublimetime

    Sublimetime Member

    445
    Oct 22, 2007
    clifton nj
    420 da
    454
    I would put it back together the same way it was when you took it apart, paying close attention to the location and type of gasket removed.
     
  3. GoFastr

    GoFastr Cool Runnings GOLD Sponsor

    148
    Jan 20, 2016
    Cayman Islands
    2003 Sea Ray 270 SunDeck MX 6.2L MPI w/Bravo III
    Tow: 2012 Ford F150 Raptor SVT
    Mercruiser MX 6.2L MPI w/Bravo III
    Yeah, I wish I had the old exhaust to see now.

    I just unbolted the exhaust manifolds from the engine and took them off in one piece.
    I gave them to the junkman and never unbolted the risers and spacers.
     
  4. Strecker25

    Strecker25 Well-Known Member

    Nov 20, 2014
    Rochester, NY
    1998 290 Sundancer
    Twin 5.7EFI/Alphas, Kohler 4kw
    Serial number of engine will help figure it out but, how many hoses feed the exhaust on each side and where do the connect? Single hose from tstat housing to bottom of manifold?
     
  5. GoFastr

    GoFastr Cool Runnings GOLD Sponsor

    148
    Jan 20, 2016
    Cayman Islands
    2003 Sea Ray 270 SunDeck MX 6.2L MPI w/Bravo III
    Tow: 2012 Ford F150 Raptor SVT
    Mercruiser MX 6.2L MPI w/Bravo III
    Serial number is L329549.
    Each exhaust manifold only has one water hose coming from the bottom of each side going to the t-stat housing.

    As far as I know everything is OEM and this may be the first time they have been replaced. Engine has 553 hours.
     
  6. Strecker25

    Strecker25 Well-Known Member

    Nov 20, 2014
    Rochester, NY
    1998 290 Sundancer
    Twin 5.7EFI/Alphas, Kohler 4kw
    I don't think thats a merc serial number, but I could be wrong.

    Anyways, with a single hose feeding the bottom of the manifold I believe you need the 4 slot gasket. See the attached exhaust bulletin PDF. I used that bulletin as a guide on our 98 5.7EFI's and all has been well for 3 years.
     

    Attached Files:

    GoFastr likes this.
  7. GoFastr

    GoFastr Cool Runnings GOLD Sponsor

    148
    Jan 20, 2016
    Cayman Islands
    2003 Sea Ray 270 SunDeck MX 6.2L MPI w/Bravo III
    Tow: 2012 Ford F150 Raptor SVT
    Mercruiser MX 6.2L MPI w/Bravo III
    OK great. Many thanks!

    So it looks like I have to use all of the 4 slot type gaskets then for my setup.

    BTW...the hull is a 1999 but the engine serial number comes up as a 1998.
     
    Last edited: Oct 17, 2017
  8. GoFastr

    GoFastr Cool Runnings GOLD Sponsor

    148
    Jan 20, 2016
    Cayman Islands
    2003 Sea Ray 270 SunDeck MX 6.2L MPI w/Bravo III
    Tow: 2012 Ford F150 Raptor SVT
    Mercruiser MX 6.2L MPI w/Bravo III
    Thanks all. Got all the parts installed and no more leaks! Life is great again.
     

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