Hi,
I'm very late to this party as it seems the original post was 12 years ago. That said, I have this issue on a '97 T444E in a '98 International 3800, so ended up here. Figured I'd document my findings to help others.
We bought a bus. Interior is pretty well done. Includes a 10 KWh solar system on roof. Had a mechanic look at it beforehand to determine why it was leaking. He thought it was the oil cooler, or oil filter mount, which are easy to replace. That said, it's not the oil cooler, or filter, but the oil pan.
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I've done quite a bit of digging. I found multiple forums (Powerstoke) that state the only way to do this is to pull the engine as you can't get to the bolts on the front of the pan due to a cross member. I found a "fair" video on youtube where they are replacing it on a 1999 4700 box truck that has been helpful. First issue is removing that cross member.
See:
I found two other forums that say you can do it, in the vehicle, but it will take around 20 hours.
I've worked as an automotive engineer for the past 17 years. I've rebuilt engines and transmissions, plus have commissioned diesels in new new vehicle builds. Anyway, I 'm not afraid of mechanic work. That said, this one looks like a hot mess. From what I'm currently seeing it appears I will have to remove the steering box to get to the left front cross member bolts. Any suggestions/ideas would be welcomed.
BTW, am planning on putting a Moroso #27293 Oil Pan gasket on it once I get it off, instead of using RTV as recommended by Navistar. It's pricey at approximately $100/set, but seems pretty worthwhile if it'll fix it--especially if it takes 20 hours to change it when it's in the bus. Looks like it should seal it once and for all! See:
Will keep forum posted on how things come out.