Some plumbing questions
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Some plumbing questions

  1. #1
    Senior Member N2GLOCK's Avatar
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    Default Some plumbing questions

    I'm in the process of converting my boat over form thru transom exhaust to OT wet headers. I have the headers, steel lines an tee and so far. I know that I need a 3/4" water dump and a gate valve for that same dump. What else do I need? I've seen members in the past talk about pressure relief valves and a gate valve located near the driver seat. Do I need these 2 items as well. Also, the exhaust that I took off was wet logs and the front of each log had 2 water supply lines. What do I to with the 2 extra lines I will have left over? Also, I found a picture that a member posted of the water pipe coming off his jet. Looks like he spliced into it and added an additional valve. Is this to have sepearte control of the engine cooling and header water?
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    Senior Member SuperJet's Avatar
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    Jet Boat Performance, Jet Boat FAQs diagrams, Impeller charts,

    here is your most basic plumbing for ot headers... this is how mine is plumbed at the moment. you can plumb in a cut off valve up at the drivers seat for running the headers dry when wanted or for a little more regulation of water to the headers. Mine will end up with a valve at the seat as well
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  4. #3
    Cas
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    Quote Originally Posted by N2GLOCK View Post
    Also, I found a picture that a member posted of the water pipe coming off his jet. Looks like he spliced into it and added an additional valve. Is this to have sepearte control of the engine cooling and header water?
    Yes, that's exactly why I did it that way. I wanted the header cooling to be a separate adjustment and it's worked just fine for about 3 years now.

    Here's a diagram I drew up back when I did the plumbing, it's for OT's-
    Last edited by Cas; 01-21-2012 at 12:33 PM.
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    Senior Member N2GLOCK's Avatar
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    Quote Originally Posted by Cas View Post
    Yes, that's exactly why I did it that way. I wanted the header cooling to be a separate adjustment and it's worked just fine for about 3 years now.

    Here's a diagram I drew up back when I did the plumbing, it's for OT's-
    Okay, I see the reasoning behind having individual control of engine cooling and header water. But why 2 dumps? That's first time that I've heard or seen that.
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  7. #5
    The Man cordog009's Avatar
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    One dump is plenty as long as it's the same size as the inlet. One less hole to cut into the transom IMO.


    1984 Youngblood TX-19 SOLD
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    Not sure of engine type. However, you may consider regulating the dump/exit side as well. Would be nice to know that there are no steam pockets or dry areas in the heads.
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