Re: RADIATOR STOP LEAK

Posted by Jon H on February 06, 2005 at 10:47:10 from (69.26.16.123):

In Reply to: Re: RADIATOR STOP LEAK posted by mattd on February 06, 2005 at 10:09:25:

The best stop leak I have ever found is black pepper. I used to do dirt track stock car racing where radiator damage was common from rock or collision damage. One of the other racers put me on to using black pepper,it will stop up a hole nearly as large as an entire radiator tube in seconds.I never found a commercial product that worked as well. The stuff seems to stay fluid untill it is exposed to air at the leak,where it hardens into a plug.I never found any internal pepper plugging of the radiator when I washed them out later to make a permenant repair. With the race car,you had pure water in the system and no heater core to worry about plugging. I never had the courage to try pepper in anything with antifreeze and a heater untill last summer. The top tank seam opened up about 10 inches long on a 45 year old farm truck that sees a few hundred miles per year during harvest. we badly needed the truck that day so I thought I would try an emergency fix with the old pepper race car stopleak trick. We never run the truck in the winter,so I was not too concerned about plugging the heater core. I added a couple teaspoons of pepper to the antifreeze coolant in the radiator and put it back to work. The leak sealed within a couple miles. The radiator leak is still sealed 6 months later and the heater works fine :-) Pepper is a non corrosive,biodegradable product that makes the coolant smell like nicely peppered soup.

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