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Steel Roamer - Exhaust replacement

Discussion in 'Chris Craft Roamer Yacht' started by marcbeaudry, Apr 10, 2019.

  1. marcbeaudry, Apr 10, 2019
    #1
    marcbeaudry

    marcbeaudry New Member

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    Hello all,
    long time lurker - first time posting -
    we've a 1962' steel hull 46'
    the exhaust pipe in the tank room is rusted through in a few spots with pinhole corrosion
    in a few spots - we're hauling this summer for a sandblast and epoxycoating the bottom - while
    it's out i've got to redo the rudder packing seals and repair the exhaust.
    My initial thought are to cut the last 3feet between the tanks and the transom out - remove
    the through hull and exterior portions.
    I'm leaning towards grinding the transome all of that smooth in/out and cutting a new through hole using a mag drill setup. the joint old/new pipe will be sleeved internally to the old pipe . I'm not entirely certain about being able to get a good weld all the way around the pipe though or the type of pipe i shoud be considering as replacement material...
    has anyone been down this road that can comment on the approach ?
    thoughts, ideas, opinions all welcome

    cheers
    marc
  2. Jorge Lang, Apr 16, 2019
    #2
    Jorge Lang

    Jorge Lang Senior Member

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    Marc,

    Feel free to send me some photos when you can. Also of the point where water is injected into the exhaust gases. What engines do you have? If the gases are properly cooled, you could make the run with fiberglass tubing. Looking forward to helping you out.

    Regards,
  3. marcbeaudry, Apr 16, 2019
    #3
    marcbeaudry

    marcbeaudry New Member

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    hello Jorge, yes - this is a wet exhaust , the engines are Ford 427's - it COULD be replaced with fibreglass - or even marine rubber exhaust I suppose - but I aim to maintain it as a the factory had intended by using steel - i'm leaning towards schedule 80 steel pipe at present.
    thanks for the alternate suggestions though

    cheers
    marc

  4. Jorge Lang, Apr 16, 2019
    #4
    Jorge Lang

    Jorge Lang Senior Member

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    If the water drains once you shut down the engine, you should be ok. You can also go with 316L stainless. Let me know if you need anything else. I only have 18 years experience with exhaust, so you'll have to excuse me :).
  5. Capt Ralph, Apr 16, 2019
    #5
    Capt Ralph

    Capt Ralph Senior Member

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    FYI
    Jorge has been THE contact for marine exhaust topics for years.
    You have an open resource here for the best.
    Bless him for sharing his new life path.
    ,Ralph
  6. marcbeaudry, Apr 17, 2019
    #6
    marcbeaudry

    marcbeaudry New Member

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    using Stainless is a good idea, i like that - would you sleeve the joint from the stainless to the old steel Jorge ? would you sleeve it inside or out ? the area available to weld is very tight - space under and towards the hull is quite tight , i'm a little concerned about getting in there properly for a certain weld - at the transom will be tight also but doable i think - especially because i can get it both inside and out.
    cheers,
    marc
  7. Jorge Lang, Apr 17, 2019
    #7
    Jorge Lang

    Jorge Lang Senior Member

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    Ralph, thanks for those kind words. While I have moved on from DeAngelo, the 18 years of knowledge is in my head and I am honored to be able to share it with anyone who might need it.
    As for the connection, it depends on the outside diameter of what you have now. The best connection would be blue silicon hose as it can take temps to 350 degrees. It will be much easier than trying to weld up to it. Also, it will be easier to access if needed in the future. Let me know if you need anything else.
  8. marcbeaudry, Apr 17, 2019
    #8
    marcbeaudry

    marcbeaudry New Member

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    Hi Jorge,
    it's 4'' (+/-) so butt the two pipe ends together and use a silicone sleeve to join them . Thanks for the advice ! kind regards

    marc
  9. Jorge Lang, Apr 17, 2019
    #9
    Jorge Lang

    Jorge Lang Senior Member

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    I would suggest you measure the outside diameter just to make sure all will fit correctly. Still would like to see some photos, I miss engine rooms :(

    Regards,
  10. marcbeaudry, Apr 17, 2019
    #10
    marcbeaudry

    marcbeaudry New Member

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    I'll take some photos and post them - the area in question is further aft - in the tank room - separate from the engine room . Yes , I agree, I've learned the hard way that you need to be very carfeul with pipe sizes ! not needing to weld the two pipes together makes life much easier as well - no need to remove the fuel tanks out !
    marc
  11. Capt Ralph, Apr 17, 2019
    #11
    Capt Ralph

    Capt Ralph Senior Member

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    I'm pondering if fiberglass tubes would be of use. Blue hose connect to the hull flange/nipple. Glass tubes to hose back to the motors. F glass mufflers somewhere in stream.
    Or did I miss something...
  12. Capt Ralph, Apr 17, 2019
    #12
    Capt Ralph

    Capt Ralph Senior Member

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    It's the mixed metals that concern me.
  13. marcbeaudry, Apr 18, 2019
    #13
    marcbeaudry

    marcbeaudry New Member

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    it was mixed metals for 60 years before failure...pretty good life expectancy . i'll be using 316L .