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7.3 oil cooler O - ring replacement

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Old 01-24-2005, 12:50 AM
Navistar444 Navistar444 is offline
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Question 7.3 oil cooler O - ring replacement

Hey I was wondering if anyone had changed the o rings on the oil cooler cylinder on a 95 powerstroke. Mine is leaking and is getting worse, was wondering if it can come apart from the rear by pulling the oil filter adapter. I know i gotta drain the coolant, but all data says that I haver to pull the fan/shroud to get at it. Anyone tried this one? Thanks for any help Josh
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Old 01-24-2005, 07:46 PM
Navistar444 Navistar444 is offline
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Anybody had this plroblem? only leaking oil onto the ground, no coolant yet.
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Old 01-24-2005, 09:22 PM
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I need to do mine also. I found this tread on the TDS very informitive. About half way down there is a post that also show pics.

http://Cat=&Board=ubb42&Number=22154...v=#Post2215473
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Old 01-24-2005, 11:17 PM
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Ok, so if my front mounting adapter is not leaking then I should be able to pullit from the back? anyone got any other tricks for keeping it together to bolt it up?
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Old 01-26-2005, 10:13 PM
Navistar444 Navistar444 is offline
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I am hoping i can pull off the back mount, pull the cylinder, then reasemble without removing the front mount. possible?
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Old 02-07-2005, 02:40 PM
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Would oil cooler o-ring failure give one black sludgy coolant??? I 'n not suer wher my oil cooler is and how to tell if it;s shot any help would be much appricateed!!! I need to know how I'm getting so much iol in my coolant. Thnaks to any one J
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Old 02-07-2005, 05:18 PM
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The oil cooler is located behind and under the vacuum pump and powersteering pump right to the block. If you look under your truck find your oil filter and right above it and forward of it. Round cylinder looking thing. I don't know if its common for them to leak internaly but its a possibilty.
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Old 02-07-2005, 07:38 PM
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I find it easier to remove the entire cooler assembly togther. Put in a vise and remove the front and rear sections. Clean the cooler itself and housings. Install new o-rings with eng assembly lube (helps w/ installing the housings back on). Ive been lucky one time to have both housings go on w/o putting them in a press. Be careful you can break the aluminum housings.
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Old 02-07-2005, 10:23 PM
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thanks!! is that a place I could get coolant mixing w/ oil what about replaceing the whole unit as apose to just the o-rings.? I found the thing today,, but how hard is it to get out? thnaks a gain J
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Old 02-08-2005, 05:30 AM
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It is a place that coolant can mix w/ the oil. You can get an entire unit but i think you still have to assemble it.
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Old 02-08-2005, 09:51 AM
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Hey internailonal tech, Thanks for the repy, I need some help pin pointing my problem, I have very thick black coolant. and I ve gotten some folk sayiing Injector o-rings, But i'm not sure. I was going to do new injectors soon any how but I'd like to get this fixed all at onec, if its realy the oil cooler since I'' have to fulsch to coolant sys any how. so If you.v got a minute, Could you check out the post buy me (black sludgy coolant) I would love another opinion... Thnanks Much J
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Old 01-19-2011, 10:22 AM
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i have a 2003 7.3 super duty and need to remove and repair oil cooler, what is the best process to remove the cooler from engine compartment for relacing o-rings?
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Old 01-19-2011, 12:41 PM
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Quote:
Originally Posted by wycowboy View Post
Hey internailonal tech, Thanks for the repy, I need some help pin pointing my problem, I have very thick black coolant. and I ve gotten some folk sayiing Injector o-rings, But i'm not sure. I was going to do new injectors soon any how but I'd like to get this fixed all at onec, if its realy the oil cooler since I'' have to fulsch to coolant sys any how. so If you.v got a minute, Could you check out the post buy me (black sludgy coolant) I would love another opinion... Thnanks Much J
Hey ,youse guys are in the wrong forum. I am not sure if the 99 and up info is the same for our your oil coolers.
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Old 01-19-2011, 05:41 PM
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A bit of oil cooler info:



O-rings and gaskets available here:Oil Cooler Seal Kit at Dieselorings




Some can push the headers on by hand but I couldn't. I used a bar clamp doing one end at a time. If you have clamps that fit on a 1/2" pipe that would be more suitable. The bar clamp flexed a bit and was just barely up to the task.
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Old 01-19-2011, 06:24 PM
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Quote:
Originally Posted by cps View Post
Hey ,youse guys are in the wrong forum. I am not sure if the 99 and up info is the same for our your oil coolers.
I think we can forgive them since the 7.3 was probably not separated into NBS vs. OBS back in 2005.

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Originally Posted by bucky7 View Post
i have a 2003 7.3 super duty and need to remove and repair oil cooler, what is the best process to remove the cooler from engine compartment for relacing o-rings?
Got to love the search function, but it usually helps if you pay attention to the dates and look for something a little more recent. It improves the chances of a reply.

For a more recent oil cooler thread, with instructions and pictures, read this link. https://www.ford-trucks.com/forums/9...e-of-year.html
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