Cummins N14 Celect Plus nightmare

Looks like there’s a copper gasket under that bolt that might be leaking. I’d cutoff the silicone, unscrew the bold and replace the washer

 

I don't guess I've ever had to do a rear main on a 14. Looks like the seal is in a cover that bolts to the block, then the flywheel housing over it?

@OLDSKOOLERnWV

 

You sure the freeze plug in the cam bore isn't leaking and running down? If so, the flywheel housing will have to come off to replace it.

 

Very similar to the old 8.3's by the looks of it.

 

Yea the oil seal slips over the crank, makes for removing the flywheel….

 

As mentioned earlier, there is a camshaft freeze plug in the back of the block. If it’s rusted from the outside in the oil will find its way done between the block and flywheel housing….

 

That Allen head plug has an o ring under it…it’s possible that it’s hard and dried up and leaking. If you replace it it needs to come from Cummins or make certain it’s a viton boss 6 o ring regular black rubber ones don’t last long
Definitely don’t think that seal is leaking because it doesn’t appear that the oil is flung all over. As previously mentioned it could be the large cam plug to which will require removing the flywheel housing one other thought…I had one that I rebuilt for a guy several years ago that he claimed needed a rear seal but it turned out someone had done an overhead and dumped a bunch of oil down the back of the block.