cooling system pressure test

jmoorepghpa

jmoorepghpa

Petty Officer 2nd Class
Joined
Apr 17, 2006
Messages
114
Anybody ever done a cooling system pressure test on a raw water cooling system? I have a used motor that is new to me which I have to do some head work on. Just to check I would like to block off the water outlets, fill the system with water and some fluorescent dye, rig up a fitting and a guage and put some pressure on it just to check the block. There is no water in the oil but I haven't been able to run it for more than 4-5 min at a time. Just want to check for problems. I would hate to get the heads back on and find out I have a problem with the block or manifold. Its a merc 888.
 
Boomyal

Boomyal

Supreme Mariner
Joined
Aug 16, 2003
Messages
12,072
Re: cooling system pressure test

I'm not aware of any such thing that you can apply to the system as a whole, especially when the heads are off. Your two areas of concern would be the basic block and the exhaust manifolds. When Fords freeze break, they usually do it across the tops of the cylinders. That should be easy to identify visually. (chebbys seem to crack in the valley)

Your mani's and risors are the other area of concern. As far as I know, you have to have them off the engine to adequately pressure test them as well as visually inspect for corrosion.

Hopefully others will weigh in here.
 
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