Had the injector pump rebuilt for my 4030. It has the roosa master pump. Trouble I'm having is rolling the shaft seal on the drive shaft when installing the pump. Rolled 2 of them. Rebuilder machined a taper in the pump bushing to aid re-installation. Thats my problem as when the seal leaves the compressor it pops open and turns. There is no room to massage the seal in as its to close to the block, cant see in the front of the pump. So I want to remove the shaft from the drive gear, install it in the pump on the bench were I can see it go in. Trouble is how can I get the shaft taper broken loose from the gear. No room to strike with hammer without removing radiator or front cover. Any ideas?