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See "Engine Problem / Head - Hole In" A cylinder head pressure test is carried out either using hot or cold water. The method involves sealing the water ways and testing for leaks under pressure. Different machines use slightly different methods but pressure testing will find cracks as well as tiny pin holes that can be missed by crack testing. The hot pressure tester shown in this site is the most common style in use today. This tester allows hot and cold testing under varying pressures. Again the cylinder head has to be stripped bare and cleaned as the hole or crack is spotted visually while under test.
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