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Did you have the seal surface on the crankshaft clean and lube ?
Did you leave the plastic protector in the seal to protect the lip as it was pushed on the crankshaft? And then remove it once installed ?

Did you Not touch the seal surface ?
The above are all in the Cummins Shop Manual

I used a genuine cummins insertion tool, not the cheesie stamped tool that comes with the seal.

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