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  1. #1

    Need Onan MDL4 heat exchanger/exhaust manifold.

    Looking for a heat exchanger/exhaust manifold.

    Thanks.

  2. #2

    Re: Need Onan MDL4 heat exchanger/exhaust manifold.

    post a pic of what you are looking for, I may have one

  3. #3

    Re: Need Onan MDL4 heat exchanger/exhaust manifold.

    Quote Originally Posted by ageless View Post
    post a pic of what you are looking for, I may have one
    1989 onan mdl4
    Attached Images

  4. #4

    Re: Need Onan MDL4 heat exchanger/exhaust manifold.

    I am looking for a good used assembly if possible, I believe mine has a crack allowing exhaust pressure to enter coolant tank. Please let me know. Thanks for the help.

  5. #5

    Re: Need Onan MDL4 heat exchanger/exhaust manifold.

    did you check the head gasket / head ass'y??????

  6. #6

    Re: Need Onan MDL4 heat exchanger/exhaust manifold.

    Quote Originally Posted by doc g View Post
    did you check the head gasket / head ass'y??????
    I have one. 727 420 5792

  7. #7

    Re: Need Onan MDL4 heat exchanger/exhaust manifold.

    Thanks for the replies everyone, I attached a photo I had. I will be down the boat next weekend and get a better one. I need the coolant, exhaust manifold, heat exchanger Assembely. Part in the top of the photo. Also anyone have a source for the gaskets? It is horrible that Cummings does not support anything. They tell you I can give you a price on new unit. I will never purchase a new onan.

    Thank you in advance!
    Attached Images

  8. #8

    Re: Need Onan MDL4 heat exchanger/exhaust manifold.

    I have found the members of this site to be super helpful with issues I have had with my Onan, they have parts sources, as well.

    smokestak.com

  9. #9

    Re: Need Onan MDL4 heat exchanger/exhaust manifold.

    I just want to thank Wild Blue for sending me his old heat exchanger at no charge. What a awesome guy. I can’t get over such a act of generosity. I will have to pay it forward to some one else. Thanks.

  10. #10

    Re: Need Onan MDL4 heat exchanger/exhaust manifold.

    I have the same vintage genny on my boat and was wondering how many hours are on your ONAN?

    (In other words, when can I expect a similar issue?)

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