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Thread: 7.3 oil cooler rebuild

  1. #1
    Mr. Fix it Sucked In Traveler's Avatar
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    Default 7.3 oil cooler rebuild

    We have had an oil cooler leaking for a long time, Not horrible but making a mess under the truck.
    So we finally dug into it.

    Not a bad job, just really messy.

    Part numbers from IH
    1807563C1 o-rings 2 needed 7.82 each
    1804414C1 o-rings 2 needed 5.29 each
    1831666C1 Flange gasket 1 needed 18.40
    1831665C1 flange gasket 1 needed 7.74
    Total after tax $55.50

    Drain as much oil and antifreeze out of it as you can.
    No need to pull the driveshaft, or anything out of the way.
    Unplug the block heater.
    Pull the oil filter.
    2 bolts on the front flange, take a 10MM socket, we used a really long extention and u-joint and did them from standing outside the front tire.
    The rear is 3 bolts. Same 10MM socket. Done from underneath the truck.



    You have to twist and turn it like a puzzle but it will come out of there without jacking the engine or doing anything else.
    Ours was Rusty to the point we are actually worried about the case leaking and not the O-rings, but so far the O-rings have fixed it.


    I guess we don't have pics of it apart, but take a dead blow, or a rubber mallet and drive the ends off, they are just pressed on and held on with the O-rings, nothing else to it.
    We cleaned up the core and painted it to protect if from rusting farther.
    We cleaned the O-ring surfaces inside the head ends.
    Be sure and lube up the O-ring when putting it back together and we used the same Dead blow and just beat it back together.
    I have read some guys use a press, and some use a ratchet strap. I am way too lazy for that.
    Clean the gasket surfaces and bolt it back up in there.
    Re fill fluids are you are done. You should do an oil change in case any Antifreeze fell in the oil. We didn't see anything like that, but it is possible.
    It is that simple


    If the pressure relief falls out it goes back in Spring first.

  2. #2
    Senior Member Sucked In SMOOTH's Avatar
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    Default Re: 7.3 oil cooler rebuild

    I'd just like to add, when I did mine, I just put the cooler between my floor jack and the bottom of my bumper to press it back together. It worked like a charm.
    Also, for me, a second set of hands wouldn't hurt to put it back on. I know for me, trying to hold it in place and thread the first bolt on each side, while keeping the gasket on, was a HUGE pain!

    Thanks for the write-up! I had also heard you had to lift the engine to get it out, that's good to know you don't. I did mine while the head (and exhaust manifold) was off.

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    Senior Member Sucked In LarryP's Avatar
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    Default Re: 7.3 oil cooler rebuild

    Eric Got a ?? for you on this.

    Henri over in Argentina Is trying to find a oil cooler for a non turbo 7.3 or someplace/someone to order the parts that will ship them there. any Idea's

    I already sent him the link for this,but I dont think he can get the parts. Were did you get them at???
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    upgrading... $5 at a time Sucked In
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    Default Re: 7.3 oil cooler rebuild

    Completely missed this thread. there is a solid possibility that the only problem with my 6.6 is the O-rings leaking H2o into the 710...

    Will reference this thread when I get the engine home.

  5. #5
    Mr. Fix it Sucked In Traveler's Avatar
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    Default Re: 7.3 oil cooler rebuild

    I got them at the IH dealer.


    Not sure what shipping to Argentina is like but I am sure we could help him out.

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    Senior Member Sucked In sheepman's Avatar
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    Default Re: 7.3 oil cooler rebuild

    Quote Originally Posted by LarryP View Post
    Eric Got a ?? for you on this.

    Henri over in Argentina Is trying to find a oil cooler for a non turbo 7.3 or someplace/someone to order the parts that will ship them there. any Idea's

    I already sent him the link for this,but I dont think he can get the parts. Were did you get them at???
    Larry does he need the whole oil cooler? I might have a couple.
    1997 F350 Centurion Pacifica
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    Moderator Sucked In 4doorbronko's Avatar
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    Default Re: 7.3 oil cooler rebuild

    Shipping shouldn't be bad.
    Just a little extra paperwork.
    List it as $25 value and a gift to help avoid import tarrifs.
    USPS is the way to go, UPS will bend you over.
    Only caution is they get sticky about sending used engine parts, anything that had oil or fuel in/on it.

    I've sent stuff to Denmark, Brazil and Germany with no issues.
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  8. #8
    Senior Member Sucked In LarryP's Avatar
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    Default Re: 7.3 oil cooler rebuild

    Quote Originally Posted by sheepman View Post
    Larry does he need the whole oil cooler? I might have a couple.
    He Is looking for a whole one Mike. Its been about 2 weeks now and they still cant find one over there. This motor is in a clean 94? bronco now. I dont know if anyone here has seen Henri's post over on FSB? he had a Toyota oil burner swapped in his 81 bronco. He is on my Local forum UC4x4.com a lot a few of there have sent him hard to get parts before. They were trying to get one off ebay but I dont know what came of that. Ill see If I can get in touch with him.

    Sorry for mucking up this thread Eric I should of just started a wanted thread on it.
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    Moderator Sucked In 4doorbronko's Avatar
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    Default Re: 7.3 oil cooler rebuild

    Quote Originally Posted by LarryP View Post

    Sorry for mucking up this thread Eric I should of just started a wanted thread on it.

    Damn thread pirate............



    William E. Shobel
    1941-2010

    "Weaseling out of things is important to learn. It's what separates us from the animals ... except the weasel. "

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  10. #10
    Senior Member Sucked In sheepman's Avatar
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    Default Re: 7.3 oil cooler rebuild

    Quote Originally Posted by LarryP View Post
    He Is looking for a whole one Mike. Its been about 2 weeks now and they still cant find one over there. This motor is in a clean 94? bronco now. I dont know if anyone here has seen Henri's post over on FSB? he had a Toyota oil burner swapped in his 81 bronco. He is on my Local forum UC4x4.com a lot a few of there have sent him hard to get parts before. They were trying to get one off ebay but I dont know what came of that. Ill see If I can get in touch with him.

    Sorry for mucking up this thread Eric I should of just started a wanted thread on it.


    I'll look threw my stash of parts. I have a many spare 6.9L/7.3L IDI parts. Heads, Blocks, whole engines, Trucks and so on and so forth. I gained a lot of parts and things in the part couple months, not all at my house, so I'll have to go and dig where i have 'um stored.
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