Cummins Marine Diesel Repower Specialists › Forums › Cummins Marine Engines › 450 C's Both Head Gaskets shot at 750 Hours?

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  • February 8, 2017 at 9:23 pm #15182

    Scott Woodhouse
    Participant
    Vessel Name: Over Quota
    Engines: 450 C
    Location: Mayland
    Country: USA

    Well, we sold our 2002 SeaRay 400 Sedan Bridge.  Great Boat, Engines have been wonderful…so we thought.  On the Sea Trial, the Mechanic found that both engines had both blown head gaskets, both inter coolers must be cologged becasue of the heat issues, and turbo boost on one of them…all at 750 hours.  So if we break it down one at a time, heopfully I can post the video’s for the Head Gaskets.  What’s weird is that it’s not Blue.

    Next, the after Cooler.  I just serviced them both.  Mechanic asked if I had them cleaned Ultra sonic.  Nope, soaked them both in simple green for three days, nasty junk at the bottom of the bucket after the soaking and checked each hole in the core. I asked him if I could have put them in backwards, he said yes and that would cause it.  Will have to look for pics.

    Finally, Boost on one side is 8lbs lower. 

    So, is this because of winterizaiton?  Thoughts?  Kind of in a pickle.

    Not sure how to upload video.  Best way to see whats going on.

     

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  • February 10, 2017 at 1:41 pm #15233

    Tony Athens
    Moderator
    Vessel Name: Local Banks
    Engines: QSB 6.7 550 HP
    Location: Oxnard, CA
    Country: USA

    Zero chances

    February 10, 2017 at 8:44 am #15220

    Scott Woodhouse
    Participant
    Vessel Name: Over Quota
    Engines: 450 C
    Location: Mayland
    Country: USA

    Let me ask this another way.  I looked in the manuel for the interval for the heads to be re-torqued.  Found Tony’s article of course, but cannot find how often or when this should be done.  The other question is, and I know this is slim, is that if the Head is re-torqued, what are the chance’s of correcting the leak?

     

    How to Torque a Cummins Marine C-Series Cylinder Head

    February 9, 2017 at 5:55 pm #15215

    Scott Woodhouse
    Participant
    Vessel Name: Over Quota
    Engines: 450 C
    Location: Mayland
    Country: USA

    I talked to a Cummins dealer today, local, he told me my vintage was not affected by the gasket issues.  They were much earlier.  The Blue I am referring too is the color of the anti-freeze.  It doesn’t look to Blue to me.  Maybe I am not looking carefully enough.  The broker talked to a friend of his, and he asked if the heads were torqued per the Cummins service requirement.  I looked at the book, and I don’t even see that in the book.

    February 9, 2017 at 7:12 am #15199

    Rob Schepis
    Forum Moderator
    Vessel Name: Tenacious
    Engines: 6BTA 5.9 330's - "Seaboard Style"
    Location: Long Island, NY
    Country: USA

    There were some issues with head gaskets on C engines in the rear area you show of this vintage but most were linked to overpropping/overloading.  Those turbos are a tad brown (indicative of high heat).  Any pictures to post?  turbos, air tubes, aftercoolers ?  How is she propped?  What rpm did she make at WOT loaded?   There is an updated head gaskets available if you pull it apart.

    What’s not blue?

    Any pics available of your exhaust coming of the turbo and all?

    What do you mean by you put the aftercoolers in backwards?  The cores 90 degrees out?…thus the flat was not on the air inlet/outlet?

     

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