To start the tanks bolts were so rusted a decent amount broke. The water outlets bolts snapped off and was seized with rust, took hours of fighting to get it off. After that the bolts came out easy with some heat and kroil.

Also thinking about rebuilding the water pump but the flat head screws are frozen in place. This is making me hope i can get away with leaving it as is. Even using a impact driver only loosen 1 of the 4 screws and bent the bit/ screw heads.

I figure if people are interested ill post more about this and more pics as i go along. 

Anything to soften the rust in the tubes would be a big help. I have done a number of Cat radiators of that design. Some I literally pounded brass weldall welding rods down the tube. Then with first rod still in tube push a 2nd and 3rd rod thru. Then finish a strip of aluminum material.

 I ended up using a random long skinny rod, kroil, av gas, and air. after i got most of the tubes cleared enough I roughed up the coating of the rod and put it in my drill, running it back in forth while adding kroil. Now they are all clean and clear and hoping theirs no leaks. Not gonna lie might end up using stop leak if it does, since repair would probably cause more damage.

As for the bolts the worst was the lower outlet. I babied them when attempting to remove them gently rocking back and forth. I fought with getting it removed for hours. I couldnt use much heat because the soldier ect. I tried using a soldiering iron and propane torch, heating it a few times. Also used a super thin hack saw to slice through the gaskets (which were like the hardest epoxy or something. All so i could get drift between it and the radiator and help loosen everything. Ended up losing the battle that night but the next day my stepdad took a endmill to it and between a little beating, prying and wiggling back in forth it came off. VICTORY!! 

Thanks, it sure is! Even in the desert after 80 yrs, rust is one heck of an opponent.

Im really not looking forward to working on the steering clutches if they don't free up. 

Thanks I've been in contact with mark. Think were just gonna run the pump. We got the plunger and spring cleaned and freed up. The shaft and bushings are in decent shape and have a tight fit. It seems like whoever had it last had replaced the bushings but unfortunately they didnt line up the front oil hole. The thrust washer leaves alot to be desired but the sealing face is still there and appears to still be able to seal. Were just thinking about putting a couple washers between the spring and plunger to add a little extra push.

We figure we might as we'll run it till it leaks to much ect then we'll buy a reman when that hill comes. I wish were made of money but were not. We have to pick and chose our battles frugally and save for the rainy days. I kinda expect we'll have to replace some of the steering clutches and who knows what else. 

Thanks for the advice I'll make sure to keep a eye on the temps. The fins seem ok, just green from the years. They are thin, but I think it will still work for what were using it for. (going to the yearly tractor show and maybe to pull something) It will probably get run a handful of times a year just to keep things moving ect.

Sorry its been awhile my health hasn't been the best. Ive gotten a few things done.

Got the water pump cleaned out and pulled the front bushing out. Found out the oil port hole was drilled in the wrong location. So I drilled it out in the right spot and dremeled a channel to the old hole so both side get lubed. I also chamfered both holes. 

I made some new brackets. It was fun since the old ones were stretched and the bolts dont all line up on the same plane. Then i took a burr to the rust and clean as much as i could without messing with the sealling surface. Still to scared to remove that since it might take to much of the sealing surface away. I also used a large square of sand paper and a flat piece of particle board to get the sealing surface as flat and even as possible on the tanks. Its probably gonna take a decent bead of rtv to seal everything. Glad the systems not under pressure. Still debating if we should try to use rust converter and red kote or another sealer. Or if we should just do the rust converter or nothing and run it as is. With how bad the tanks are rotted its hard to put money into them vrs maybe trying to find different tanks.

I also jb welded a piece that had broken of the corner of the top tank. We were going to braze it but since its so old and rusty we didnt want to risk it. Also cast iron is supposedly one of the hardest things to weld/braze and we dont have any experience doing it. So steel jb weld it is.

I also started to clean out the coolant chamber in the head. This was after putting a shop vac and shop air to clean it. Then removing the outlet and finding this under it. I cleaned all this rust out to but HOLY COW they dont lie when they say "Rust Never Rests". The thing was solidly clogged with rust. Kinda scared to run evapo rust through it now because i feel like its possible that rust is whats holding things together.

Also hears a pic of it with the hood and fenders off. Ive posted elsewhere but figure I should put one up.

Dont give up... YOUR WINNING !!  

Yup!

I just love seeing this type of documentation on a project

(I need to do better on mine)

As for running I dont know if it ever will, but it does crawl back in forth lol The steering clutches are stuck though so no left or right.

Sorry its been awhile. Recently used rustoleum rust reformer and self etch primer on the radiator tanks, and supports. Heres some pics, I thought I had taken pics of the rust reformer coat but guess it didnt save or im miss remembering.

I dont know why the first pic is super grainy sorry.