Re: CLR to clean out Engine Waterways

Posted by JWL On 2010/12/3 12:38:10

portlandon, some years ago I had a '39 Cadillac 60 Special (L-head V-8). I had the engine in the car, but the block was stripped of all accessories and equipment. The water jackets had heavy deposits of rust and gunk. After power washing the jackets as good as I could, I blocked off water passages and filled the system with a light solution of Drano. It was successful in ridding the system of more rust and gunk, and a nasty greasy residue. I did not leave the Drano solution in the engine very long and thoroughly rinsed it out. I think if you are careful you can use something like this. It worked for me. Of course, the best thing to do is have the engine block dunked in a cleaning solution by an engine rebuilder. I had the cylinder heads dunked since they were off of the engine. My thoughts.

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