i decided to replace the front seal in the gear drive while engine was apart.

i pressed out the idler shaft to remove idler gear to gain access to replacing the seal.
once seal was done , i'm having trouble getting the idler gear shaft back in.

using a large arbor press and after pressing back out a couple times to try chamfering leading edge and some light sanding and cleaning on shaft..... also aluminum bore is not scuffed or galled

i used some arp moly lube and still can't press it in without moderate to almost extreme force.

i get it to with in a 1/16" to 1/8"

it's almost like it was heated on first assembly

any suggestion's?