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  1. #1

    Default Riser Pass Thru Plate

    Hello,
    I have twin 8.1's with fresh water heated risers. There are 2 metal plates on each riser, a pass thru and a blocking plate. I understand the need for the blocking plate but not the pass thru plate. Is the pass thru plate necessary and can just a gasket be placed there instead ?

    Thank You
    Smbdck

  2. #2
    Join Date
    Sep 2008
    Location
    Maryland - USA
    Posts
    6,824

    Default Re: Riser Pass Thru Plate

    the 8.1 uses what they call "wing plates" and they come in the blocking and pass thru configurations. I suspect it is due to the 'wing' around the exhaust passage. My understanding is that it is there to "catch" any water (which shouldn't be in that area of the passage).

    on the 'heated riser' configuration the block off version goes between a pair of gaskets and that assembly goes between the riser and the elbow. (Same assembly would go between elbow and manifold in a no-riser setup.) the riser-manifold uses the pass thru plate between a pair of gaskets. I don't see the need for the lower wing plate if the upper one is installed. as a general rule, unless they are damaged, either plate can be reused with new gaskets....

  3. #3

    Default Re: Riser Pass Thru Plate

    Quote Originally Posted by makomark View Post
    the 8.1 uses what they call "wing plates" and they come in the blocking and pass thru configurations. I suspect it is due to the 'wing' around the exhaust passage. My understanding is that it is there to "catch" any water (which shouldn't be in that area of the passage).

    on the 'heated riser' configuration the block off version goes between a pair of gaskets and that assembly goes between the riser and the elbow. (Same assembly would go between elbow and manifold in a no-riser setup.) the riser-manifold uses the pass thru plate between a pair of gaskets. I don't see the need for the lower wing plate if the upper one is installed. as a general rule, unless they are damaged, either plate can be reused with new gaskets....
    Thanks for your response. I agree, there really is no need for the lower pass thru wing plate. I guess there is no way to contact Crusader anymore and ask them.

  4. #4
    Join Date
    Sep 2008
    Location
    Maryland - USA
    Posts
    6,824

    Default Re: Riser Pass Thru Plate

    There Tech support dept still answers the phone - but, to be honest, I haven't called in a couple months. That said, I wouldn't expect any answer provided to deviate from the original (production) configuration.....

  5. #5
    Join Date
    Dec 2008
    Location
    Bourne, MA, USA
    Posts
    309

    Default Re: Riser Pass Thru Plate

    I believe the wing plates are designed to catch and boil off any water/moisture that may run down the inside of the riser or elbow to keep it out of the engine.

  6. #6
    Join Date
    Jun 2008
    Location
    Island Heights, NJ,
    Posts
    2,603

    Default Re: Riser Pass Thru Plate

    In the MERCRUISER world, they are called "turbulators" and catch condensation that forms on the inside of the elbows when engine first starts under most weather conditions.
    Capt Bob
    1969 23ft ChrisCraft Lancer
    Merc 5.7L 260HP/ Volvo 280
    1972 22ft Bristol
    Honda 7.5HP 4 stroke Long shaft

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