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Factory Oil Cooler Block that is on some of them, my 2500HD has the same on the 6.0l that is in it. Someone clipped it pulling the Engine out fast because people are potato.
On another note this is External Engine, not internal.
Yup, oil cooler lines. Factory setup. The lines go to the cooler, which is in the radiator, in the hot side tank, much like the trans fluid cooler in the cold side tank.
Yup, oil cooler lines. Factory setup. The lines go to the cooler, which is in the radiator, in the hot side tank, much like the trans fluid cooler in the cold side tank.
If it's a factory setup, am I ok to seal it off? Do I need an oil cooler?
Yup. Oil MUST flow out the hole connected to the front line, and back into the hole for the back line. Unbolt it and you'll see the holes. Vehicles without the cooler use a plate kind of thing that covers and connects the 2 holes.
Yup. Oil MUST flow out the hole connected to the front line, and back into the hole for the back line. Unbolt it and you'll see the holes. Vehicles without the cooler use a plate kind of thing that covers and connects the 2 holes.
Word of warning: those 2 bolts are 6mm. Probably the worst metric size they can possibly be, with the possible exception of 11mm (the size our head bolts are). The threads for that size are VERY fine, and they only go into the aluminum of the pan. It's VERY eeeeeeeeeezzzzzy to overtighten them and strip the holes in the pan out. Almost inevitable I'd say. I'd STRONGLY recommend installing Heli-Coils in those holes while they're accessible, BEFORE isntalling the little cover thing, instead of putting in the motor, discovering there's a leeeek, and finding yourself in ohshit what do I do now mode.
Note also, the 2 long bolts in the back corners of the pan go into the rear cover, and they have the same problem. Launch a preemptive first strike on all 4 of those holes. For those 2 you'll have to drop the pan and put in a new gasket, and wouldn't having a new pan gasket just be a crying shame. Who knows, you might find lovely surprises in the pan anyway; not least, the possibility of an inch of crusty gunk built up in there. When you put the pan back on, use a straightedge across the back, to make sure the combined surfaces of the pan and the block, are properly aligned.
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What is this??? 
Who knows, you might find lovely surprises in the pan anyway; not least, the possibility of an inch of crusty gunk built up in there. When you put the pan back on, use a straightedge across the back, to make sure the combined surfaces of the pan and the block, are properly aligned. 