shmkr,

Your profile doesn't list what type rig you have, so I'll make an assumption it might be a Stovebolt six of some sort.

Yes, you would have to remove the camshaft to press the gear off. The factory oiling for those timing gears is a small spigot that protrudes from the front of the block. It should be obvious..you should see it sticking out. It has a weird looking end that appears someone might have pinched it with vise-grips.

This spigot, or tube drips/sprays oil onto the timing gears. It's tapped into the oil galley, and is know to plug up occasionally.

I think you can pull it out with vise-grips or channel locks if you slowly turn and pull it. It needs to be reinstalled in a specific manner, pointing in a specific direction.

How have you determined oil isn't getting to the gears? There is a common connection with the crankcase at the bottom of the timing gear enclosure and I have heard that the general splashing and oily environment usually keeps these adequately lubricated even if the little sprayer is partially plugged.

The sprayer has a small hole in the end. See if it's plugged before you start ripping out the cam etc...it might be a simple fix.

Stuart