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New radiator, rusty block

B

BobReeves

Member
Going through an older Kubota compact tractor. Am having the radiator redone by a local radiator shop that says it will be like new when i get it back. Block has some surface rust in the water passages and am a little leary to just install the new radiator and fill it with coolant. I don't see any chunks just surface rust but still...

Afraid if I install the new radiator and add any kind of flush it will just plug up the radiator. What would you do?
 
Cap off the lower inlet to the block, and fill it with vinegar. Let stand for 6 hours and drain/flush with clean water. The new Coolant you put
in will have rust preventive additives. Jim
 
If you can find a way to flush clean water through it before the radiator goes back on, all the better. Especially if you use vinegar or any kind of flush, the residue needs to be flushed out.

If you can secure the garden hose into the lower radiator hose, pull it up so the water pump is flooded, you can run it while flushing it. But you need to bypass the thermostat to get full circulation. If there is a bypass hose, or a plugged heater hose connection, open that so the water will free flow through the engine. Or take the thermostat out temporarily. If there is a block drain plug, remove that also. It will probably be covered with sediment on the inside, may need to poke it out with a stiff wire.

Once you get water circulating, let it run at fast idle. The flow will soon clear up once the free rust is flushed out. The water will finish draining out the block drain.
 
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