I bought a 7.3 IDI for a KILLER deal one time because it had a rear main oil seal leak. It was coming out from the bell housing. After a week or two the oil leak went away and I had a fuel leak. a $20 part from the Pick-N-Pull had me up and running for years.
It’s definitely oil but I checked all the suspect places for fuel leaks as well just in case. Everything has checked out good. Just the one plug on the oil rail (where the aftermarket crossover rail would go) has me wondering because it was slightly damp with oil. I’ll be able to watch that one when it’s running again it’s pretty easy to see with everything in place.
I’ll try to grab some pics if it’s still leaking after putting it back together.. I assume it will be I haven’t changed anything.
Cleaned it up real nice and I’m still getting oil in the valley. The only place I could see that is suspect is this oil plug and it’s just damp no signs of leaking though at least not enough to worry me too much. Here’s a crappy pic of it anyway.
You really should be able to find a wet spot. Oil leaks are easier to find since they are of a thicker viscosity. Fuel might not be as easy.
The passenger fuel line runs close to that plug and has been known to have a clamp chaff a hole in it. working on your turbo recently might have been enough to create more wear. I replaced that steel fuel line in my truck about 5 years ago, it had a decent chaff in it, but not all the way through.
I'm running both the oil and fuel crossovers on my truck. The oil crossover made a huge difference in how the engine sounds and when running the truck on AutoEnginuity, the percels (cylinder contributions) are more even and smooth. I'd recommend it.
The only thing the fuel crossover helps with is bleeding air out (wouldn't recommend it).
If you have time to drop by sometime, I can show you the truck and how smooth it runs
Not to make light of your pain, but I came across this a while back and it seems appropriate right now haha. 7.3's are great, but I have a couple buddies that have/have had them and they have dealt with some oil leaks.
Had a great weekend at the Wyoming badlands. Right around 300 miles round trip I didn’t get a whole lot of riding in but my daughter sure did. The fixer-upper Polaris did great she had a lot of fun on it.
The truck ran amazing. Logan canyon put it to the test and I could mash the petal and not put the egts past 1200* so that’s right where it needs to be. Boost peaks at 24psi… Oil leak is gone too which is nice!
Good luck. The AC just went out on my superduty. Looks like the refrigerant leaked out of the manifold line (original '02 line). I've got new lines on order and a new drier ready to go in. Once parts are here I hope to get it squared away. No fun without AC in this heat!