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'99 & up 7.3L Power Stroke Engine and Drivetrain Discussion of the '99 & up 7.3L Power Stroke diesel engine and drivetrain in the 1999-Up Super Duty trucks and Excursions. No gas engine discussion allowed except on transmissions and drivetrain that pertain to all models. Please confine discussion of topics in this forum to those items that are specific to the 7.3L Power Stroke engine.

Thread: Massive oil leak from passenger's rear of engine Reply to Thread
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  Topic Review (Newest First)
09-18-2018 11:11 PM
Redlineauto
Quote:
Originally Posted by Calico5 View Post
If the pan was tweaked/damaged, I think I would've probably bought a new Milodon pan and gasket setup. Supposed to be a bit heavier of a pan, and much easier to seal without using the Ford silicone gasket stuff...

To bad you couldn't have cleaned it all up and made it look purty before you put it all back together... [IMG class=inlineimg]/forums/images/TheDieselStop_2015/smilies/tango_face_grin.png[/IMG]
Glad you found the problem though!
Dude, I bought this truck to own for 3 months and I've had the engine out twice, I don't care if it goes back together with bubble gum, I just need it to run so I can get rid of it 🙂
09-18-2018 10:37 PM
Calico5 If the pan was tweaked/damaged, I think I would've probably bought a new Milodon pan and gasket setup. Supposed to be a bit heavier of a pan, and much easier to seal without using the Ford silicone gasket stuff...

To bad you couldn't have cleaned it all up and made it look purty before you put it all back together...
Glad you found the problem though!
09-18-2018 10:27 PM
Redlineauto Couldn't quite believe it, but here we are. Better than a cracked block or something catastrophic like that. Engine came out in three hours flat this time, rather than it being an all day affair. Started at noon and had the pan back on to cure and was still home by dinner time. Pretty happy with myself on that one.

Guess the pan must have gotten tweaked at some point and I either missed it or it got knocked around on install and made the matter worse. Hammered it back straight, absolutely drenched it in the TA31, and buttoned it back up. Hopefully tomorrow I get to actually drive the truck.
09-17-2018 11:47 AM
bugman When you pull the engine why not use some of that old oil and poor it into the engine and see if you can see where it is leaking as you fill it? First I would clean up a lot of the mess and then try it.
09-17-2018 11:23 AM
Calico5
Quote:
Originally Posted by Redlineauto View Post
At this point I'm fairly confident the corner of the pan isn't sealed right. Maybe I didn't get it back into shape enough to form a good bond. But looking at the oil galley on the old block, oil comes straight out and hits that corner. As much as I can't believe it, it makes sense and that's what is wet. Engine comes back out Monday.
Yes, that is what I'm thinking. Pan has to be leaking in the corner and/or around the crank bearing journal.
I guess we'll all know soon enough!
09-15-2018 11:23 PM
Redlineauto At this point I'm fairly confident the corner of the pan isn't sealed right. Maybe I didn't get it back into shape enough to form a good bond. But looking at the oil galley on the old block, oil comes straight out and hits that corner. As much as I can't believe it, it makes sense and that's what is wet. Engine comes back out Monday.
09-15-2018 08:03 PM
Calico5
Quote:
Originally Posted by klhansen View Post
I recall there being a plug behind the rear camshaft bearing. Similar to a freeze plug. If that were missing or loose, it could dump lots of oil into the space behind the block. I used to have a photo, but can't seem to track that down now.
I found this pic...
There are two plugs on either side of the cam bearing journal, which I believe are the ends of the left and right lifter oil-galleries.
I think if one of these plugs was missing, that it would leak/bleed basically all of the oil pressure from the engine; the engine probably wouldn't even start/run. Also, it would be "blowing" out on to the flywheel, being flung out (the oil in the video appeared to be coming right down the block).

If that plug was loose (enough to leak), I don't think it would be at the volume seen in the video.


There is a plug on the back of the turbo pedestal, (visible at the top of the second photo), but that one would be outside/above the bell housing, so I don't think the oil would be coming out where it was in the vid.
09-12-2018 01:51 AM
klhansen I recall there being a plug behind the rear camshaft bearing. Similar to a freeze plug. If that were missing or loose, it could dump lots of oil into the space behind the block. I used to have a photo, but can't seem to track that down now.
09-11-2018 11:16 PM
Redlineauto And if it does turn out to be up top I'm going to want to know how it's possible that it leaks when adding oil. That'll be a mystery
09-11-2018 11:13 PM
Redlineauto My scope gets here tomorrow, hopefully that'll be a conclusive answer. I still think, as much as it shouldn't be possible, it's that corner of the pan. The upper back of the motor is visibly dry. The valley is visibly dry. I can't see much above the pan, but I can sort of feel it, and it feels dry. The only place I can see oil and the only place that feels wet is that corner of the pan. So if it's not that, it's something that feeds into that galley in a place that's not readily visible.
09-11-2018 07:51 PM
RT It almost has to be coming from up top. In your video, the oil is clearly coming out of the bellhousing area. Valve cover gaskets, oil rail end plugs, cracked heads, etc. would all be coming from outside the bellhousing. The ONLY thing that can leak internal to the bellhousing are things that either drain out the valley drain hole or the rear main seal. There is no way it is a RMS.
09-11-2018 07:37 PM
bugman Are you sure that it is leaking when filling and not just residual oil that has been sprayed or accumulated somewhere on the block?

But I agree on having someone start the engine while you are watching. That much oil coming out you should be able to see it in a heart beat.
09-11-2018 06:10 PM
Redlineauto I just don't understand how something in the valley can leak when adding oil to a drained engine. And I'm going to look again when my scope gets here, but I am willing to bet my entire bank account that it's not coming from up top.
09-11-2018 10:14 AM
themule67 The only time I ever lost that much was when the exhaust back pressure valve on the turbo failed. I left the truck running ran into the house grabbed a cup of coffee maybe 4-5 min. I came back out and oil was pouring out from under the truck popped open the hood and oil was overflowing the valley front and back. A piece of rag was blocking the drain hole at the back of engine and it wasn't draining like it should that is why it overflowed the valley. If I remember correctly I lost about 3 gal. during that 4-5 min. Good luck! themule
09-11-2018 08:45 AM
RT Personally, I'd fill it up with a gallon or two of used oil or the cheapest oil you can find. Then I'd get up on top with a flashlight and have someone start it. It is definitely coming from the valley. A leak that big, you should be able to find it within a few seconds. The only time I ever had a leak close to that, it was coming from a blown HPOP line fitting.
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