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Oil seeping from Bell-Housing seep-hole '05 325/600

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Greetings fellow diesel enthusiast.



I have recognized a subtle possibility of an oil leak nearing my transmission bell-housing dust-shield. Also I have found that the two bolts on my engine-block oil-pan near the rear, where the Trans meets the engine-block are leaking oil.



First off I will try and describe the Bell-housing leak. I have only noticed a very slight (black) like motor-oil mark on my driveway once about two weeks ago. I wiped it up, but could not see any oil seeping from anywhere else under my truck? I looked in between the Bell-Housing, looked at the blow-by tube, the oil-pan, the oil-line from the turbo back to the oil-pan, nothing.



A week later I notice in between my Bell-housing and transmission, I’ve got fresh oil around two-bolts? I wiped this oil in the aforementioned cavity clean, and it continues to come back within a day or so? Not a runny oil, it’s just wet around the two bolts. Well today I got out a 10mm socket and wrench and tightened the bolts, *note of which were the only two that appeared to be hand tight from the factory.



Well that’s one issue, the other is my Bell-housing had an apparent drip of oil starting from the seep hole or lower bell-housing dust shield. I wiped it clean then, proceeded to remove the cover to see where this new oil-leak is coming from. When I pulled the dust cover off, the inside of the bell-housing as far as I could see inside, was for the most part spotless. I did notice on the right side, inside of the housing, for relation purposes ***Turbo side*** of the housing, there is a small trail of oil. It’s definitely motor-oil, but cleaner than the motor oil in the crank case, of which is usually black. If I wipe my finger around the inside of this housing, I get a little bit of fluid on my finger, so I can tell it’s a slow leak, although I am worried. Anyone have any ideas where It might be coming from. ?



Some history on my truck. It’s an ‘05 I’ve got 24K miles, I’ve changed my oil every 5K wether it needs it or not. I am a moderate to semi aggressive driver, I like to take off from lights, but then slow to the speed limit. I always warm the truck fully before getting into the powerband. I’ve had an Edge/Juice w/ attitude for about three-weeks now. I useually ride around town on #1-#3 setting, but have tried out #4-#5 setting a time or two. I have not towed with the box, but have prior 8K lbs Trailer no big deal. Other than that truck is babied. If I can’t figure it out this week. I hate to say it, and as much as I am a firm believer on turning the only bolts on my truck, I might have to figure out how to take the edge/ juice out & take’er to the stealership for service.



I’ve included a few photos is it might help diagnose my leak.



Thanks in advance.



Ryan



These are the bolts that were hand tight, and leaking oil. I don't know if they just rattled loose or the factory monkey'd them on like that?



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This Is the dust shield at the base of the bell-housing. I had a small drip starting from where the seep hole is located.



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This is what the housing looks like with the cover off.



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This is looking into the housing, w/ cover off. *Note how clean it is, although the drip or oil trail is coming from inside the right corner of this housing.



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-Ryan
 
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Also, big help if anyone's got a photo or picture of the rear side (Flywheel) side of a Cummins B-series so I can tell where in approximate relation might the rear-main seal be at.





As a side note. I've checked my oil-level a few times. It's not burnning any or appears to be losing any. And I'm about 20 miles from my next oil-cange.



-Ryan
 
Have a 04. 5 with same trany symptoms at 25K. Noticed at recent oil change but not at the one before at 20K. Wiped it down and after just getting back from a 2K trip it is still dry. :confused:
 
TTT



I noticed that my truck has this leak too. It is not the oil pan bolts, or the blow-by tube, because if I take off the inspection plate there is a small amount if oil in there as well.

Could my transmission have anything to do with this? I have a Suncoat tripple disk along with a Suncoast valve body, flex plate and all the other stuff. This thing will shift HARD into 3rd and 4th lock-up, especially when the TST is on. Could this deflect the crankshaft enough to let oil out the rear main seal? I also switched to Rotella 5w30 for the winter. Could an overfilled crankcase cause this?

Anybody have any ideas?
 
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