Rust at steel radiator fill tank.
While doing my Water pump on our 3126 Cat, pulled the steel tank from the fire wall, per Bruce Beans suggestion. Lots of rust between them, not any holes in the tank. Lots of heavy pitting, and much metal scales.
Light scrap then wire brush, then sprayed rust killer from Napa. Some black paint, and we are back in business. A guy could do this easily by draining just the tank. Easy to do, easy to remove. I just laid it on a portable table, and did the resto work.
If you have time, I would recommend doing it. Bruce told me he got a hole in his tank he had to patch. One of those simple proactive jobs that I was too lazy to do till now.
Sorry I don't have pictures, was too dirty and hot to take them.
At what Bob said, $240.00 hrs in Vegas for shop rate, easier now then on the road.
Chris