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JHFORD51 · 06-28-2014, 08:25 PM

I'll add that I also tried evaporust on a operational engine. This was a 50 (about 4.5 gallons coolant capacity). Former owner had put in Al radiator and didn't use any zinc. I drained about a gallon of coolant and replaced with evaporust. I took several 20 to 30 miles drives over a two week period. Then I drained and flushed several times. A the time I also had a leaky thermostat housing so when changing I was able to look down inside the engine. Both radiator and head were much cleaner appearing when I completed the process.

06-28-2014, 08:25 PM	#23
JHFORD51 Senior Member Join Date: Feb 2011 Posts: 259	Re: Cleaning rust from water jackets. I'll add that I also tried evaporust on a operational engine. This was a 50 (about 4.5 gallons coolant capacity). Former owner had put in Al radiator and didn't use any zinc. I drained about a gallon of coolant and replaced with evaporust. I took several 20 to 30 miles drives over a two week period. Then I drained and flushed several times. A the time I also had a leaky thermostat housing so when changing I was able to look down inside the engine. Both radiator and head were much cleaner appearing when I completed the process.