There are a lot of discussions over this method, some thing it's the greatest thing since sliced bread (hmmm, what was the best thing before they learned to slice bread???? ) and others will say that it's a load of bunk. Personally I do this and I think it's great for cleaning an engine. What you will need is anti-freeze that you use in your car and a disposable crock pot. The anti-freeze MUST be the green type of anti-freeze that contains glycol, the other "environmentally safe" anti-freezes won't work. The crock pot much be disposable, meaning that you will NEVER cook food in it again. This is especially important because it could poison somebody eating the food.

To do this cleaning you need to do it in a well ventilated location, not inside your house. The heated anti-freeze will give off toxic fumes so this needs to be done outside. Disassemble your engine and place all of the parts in the crock pot. You need to remove any rubber or paper parts such as gaskets and seals because the antifreeze will eat these away. Now pour in the anti-freeze to cover the parts, you'll need about 1/2" or so over the top of the parts. Now turn on the crock pot and let the parts soak in the pot. How long it takes will depend on how much gunk is on the the parts, but can take up to 12-16 hours or more. Every couple of hours pull a part out (use tongs and protect yourself from burning yourself please) and use a toothbrush (once again, don't ever use it for you teeth again) and see if you can brush away the gunk building up on it. Once you can brush all of the gunk off you're done and go ahead and stop the process. Scrub all the gunk off and then rinse all of the anti-freeze off. Immediately blow all water out of any bearings and put a little bit of 3-in-1 oil or sewing machine oil in the bearings to protect them from rust.

Hope this helps

Ken