[Edbo]

I realise you did not build the motor and don't know the answer to this, but there are supposed to be two alignment dowel rings between the block and the timing cover to center the front seal on the crank snout. A new front cover (I bought one) does not come with the dowels.
The mount bolts are sloppy enough to off-center the seal on the crank without the dowels. There's a workaround for no dowels, but it requires the timing cover to be removed first. If you're interested, let me know.

Could also be as simple as..... the garter spring came off the seal.

Ed