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Iowa | Update to this thread - https://www.newagtalk.com/forums/thread-view.asp?tid=1141172&posts=9...
Called Cummins to order new cooler cover. Old one had a casting no. of 3974324(Parts diagram says to order 3974325). They said it's obsolete and I need a 5450367 along with a 5403905 gasket.
I ordered them. They're expensive.
Googled the part numbers and found this service bulletin. TSB180043
TSB doesn't mention a thing about the problem I experienced however as you can see in the pictures the problem area on my old one has been completely eliminated.
Old one has a galley that leads to the filter head down to the cavity where the pressure regulator valve dumps excess oil back to the crankcase. I have no clue what this galley does as it appears it's plugged when the filter adapter is installed.
Screw drivers are pointing to it in the pictures.
I believe with the oil filter off a guy could look up there with a flashlight and mirror to inspect but would be easier with the 4 bolts and filter adapter removed.
I don't have it on yet so I will post if something goes sideways on reassembly/startup with the updated cover.
 (TSB1 (full).jpeg)
 (TSB2 (full).jpeg)
 (TSB3 (full).jpeg)
 (TSB4 (full).jpg)
 (TSB5 (full).jpeg)
 (TSB6 (full).jpeg)
 (TSB7 (full).jpeg)
 (TSB7 (full).jpeg)
 (TSB8 (full).jpeg)
 (TSB9 (full).jpeg)
 (TSB10 (full).jpeg)
 (TSB11 (full).jpeg)
Attachments
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 TSB1 (full).jpeg (111KB - 337 downloads)
TSB2 (full).jpeg (93KB - 329 downloads)
TSB3 (full).jpeg (87KB - 315 downloads)
TSB4 (full).jpg (84KB - 326 downloads)
TSB5 (full).jpeg (168KB - 307 downloads)
TSB6 (full).jpeg (106KB - 308 downloads)
TSB7 (full).jpeg (111KB - 318 downloads)
TSB7 (full).jpeg (111KB - 309 downloads)
TSB8 (full).jpeg (86KB - 317 downloads)
TSB9 (full).jpeg (94KB - 307 downloads)
TSB10 (full).jpeg (75KB - 336 downloads)
TSB11 (full).jpeg (129KB - 296 downloads)
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8.3 Cummins Failure Analysis Pt. 3
