Like Jerry and his 29 I am also trying to work out the bugs on my 31 since it is back on the road. I did a search and it was fun reading the old reply's from Chipper, Gene, Mr.Mack, JYD , and others. After all that I should not have questions but I am slow.
So I believe air is coming past my water pump shaft causing it to foam when the engine is slowed down. I have some water pump grease and coolant coming out of the pump that is visible on the shaft . I did tighten the packing nut with only slight help. I added a ring of packing and it is still foaming when the engine slows coming to a stop.
The engine is not over heating and runs well.
Question # 1 is how tight should I go on the packing nut or where do you stop before you cause problems with the shaft over heating?
Question 2# I noticed a small hole in the radiator inlet pipe, inside the radiator just under the cap. The hole points up towards the cap. Watching it run at idle does not look like it would be a problem. Looks like a rust hole. Could this be causing my problems?