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Post 42 hull #3. The return

Discussion in 'Post Yacht' started by baltimore bob, May 27, 2014.

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  1. baltimore bob, Dec 27, 2016
    #141
    baltimore bob

    baltimore bob Member

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    Well there's yer problem!

    old elbow.JPG
  2. Capt J, Dec 27, 2016
    #142
    Capt J

    Capt J Senior Member

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    What are we looking at in the picture?
  3. baltimore bob, Dec 28, 2016
    #143
    baltimore bob

    baltimore bob Member

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    That is the discharge side of the exhaust elbow from my Port engine. There should be 4 water discharge ports!
  4. Capt Ralph, Dec 28, 2016
    #144
    Capt Ralph

    Capt Ralph Senior Member

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    Uuhhgg..
  5. mfan46, Dec 28, 2016
    #145
    mfan46

    mfan46 Member

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    No wonder you had to bypass,you will have good temps now.
  6. shawn, Dec 28, 2016
    #146
    shawn

    shawn New Member

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    With that kind of back pressure on the water I am surprised you did not blow anything. With normal flow going through the 671 you should only have 4 lbs back pressure.
  7. chesapeake46, Dec 28, 2016
    #147
    chesapeake46

    chesapeake46 Senior Member

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    Hi Bob,
    Holy cow, how did they ever cool off !

    Are your 671's turbo'd ? I have cast iron mixing elbow I would part with if you need it but it is for 410 HP turbocharged 671. The elbow is new and in perfect condition.
  8. baltimore bob, Dec 28, 2016
    #148
    baltimore bob

    baltimore bob Member

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    Yup, that's why I added 1/2 inch bypasses to both engines to get through the season. It manifested itself by blowing off hoses after I replaced impellers. Even with the bypasses it was running 30+psi at cruise. I knew it was coming and you can see the new stainless elbows a few pages back. I'm finding out my old body doesn't bend like it used to!
  9. shawn, Dec 28, 2016
    #149
    shawn

    shawn New Member

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    Yea I know, I am not as young and rubbery as use too be. L.O.L
  10. Beau, Dec 28, 2016
    #150
    Beau

    Beau Senior Member

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    Teach me. Where would those 4 ports usually be located?
  11. baltimore bob, Dec 28, 2016
    #151
    baltimore bob

    baltimore bob Member

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    If you look closely you can see the oval shapes at 2, 4, 8, & 10 o'clock.
  12. mwwhit1, Dec 29, 2016
    #152
    mwwhit1

    mwwhit1 Senior Member

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    Hi Bob!! Wow that thing is gone. At least that confirms your issue. Always good when that happens. Do you also have the aluminum exhaust angle piece between this elbow and the muffler? If so, good to check the condition of these since you have the exhaust apart. These rot out too over the years. I shipped my old ones to D'Angelo's in Fl and they made perfect copies.

    http://www.yachtforums.com/threads/exhaust-fabrication.12689/#post-95805
    Last edited: Dec 29, 2016
  13. chesapeake46, Dec 29, 2016
    #153
    chesapeake46

    chesapeake46 Senior Member

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    Me too with the same good results.
  14. porthole, Jan 16, 2017
    #154
    porthole

    porthole Member

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    FWIIW, when I had to replace my cast iron elbows, I used Marine Exhaust in Farmingdale NY.
    http://www.marinemanifoldcorp.com/Risers.html

    Didn't have to send the old ones, they were able to build based on my application (J&T 6-71 TI).
    Top notch work.

    Exhaust_elbow_01 copy.jpg Exhaust_elbow_05 copy.jpg
  15. porthole, Jan 16, 2017
    #155
    porthole

    porthole Member

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    My 1982 42 had the same port and starboard hatches as shown here, but I did not have the center hatch.

  16. shawn, Jan 16, 2017
    #156
    shawn

    shawn New Member

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    I had them do mine as well years ago, but he redesigned and did your's a lot better.
  17. baltimore bob, Jan 21, 2017
    #157
    baltimore bob

    baltimore bob Member

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    That appears to be OK. Mine is a Y the other branch acts as a surge tube. I hope to get back on her next week. Somebody has to keep posting during the winter!
  18. baltimore bob, Feb 23, 2017
    #158
    baltimore bob

    baltimore bob Member

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    2017 rot.JPG
    Well time to get started on the boat. Figured I'd get started installing the new exhaust elbows when I noticed some paint lifting. A few minutes of poking and all is normal in my world!
  19. baltimore bob, Feb 23, 2017
    #159
    baltimore bob

    baltimore bob Member

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    I've been posting so much ugliness, Here's a shot of her cleaned up at last summers casual meet. I hope we do that again!

    post cambridge 2.jpg
  20. Davidoc, Feb 23, 2017
    #160
    Davidoc

    Davidoc Senior Member

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    Winter:Delray Beach, Fl Summer: Bahamas
    Every time I go to take care of the next project I get side tracked because I look around too much and spend a few days fixing something else so I feel better about fixing what I started out to do. Knock it out. Summer is coming up there and May for me is Bahamas time. New power cord is next on the list for me.
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