I have a leakless water pump it's the type that the rear bearing needs to be greased. The instructions said to loosen the packing nut so the grease doesn't go into the coolant. So that's what I did. The question I have is how tight do I tighten the packing nut ? Do I make it finger tight or just tight enough to hold things together? I don't want to over do it it's a 1 year old pump