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The cylinder head inspection method is as follows


(1) Check with coloring penetrant: immerse the cylinder head in a kerosene or kerosene coloring solution (mass fraction of 65% kerosene, 30% transformer oil, 5% turpentine and a small amount of red lead oil), take it out after 2h, and wipe dry Oil stains on the surface, coated with a thin layer of white powder paste, and then dried, if there are cracks, black (or colored) lines will appear.

(2) Water pressure test: install the cylinder head and gasket on the cylinder block, install a cover plate on the front wall of the cylinder block, and connect the water pipe to the hydraulic press to seal other water passages, and then press the water into the cylinder Body and cylinder head. The requirement is: under the water pressure of 200~400 kPa, keep it for no less than 5s, and there should be no leakage. If there is water seeping out, there should be a crack.

(3) Oil pressure test: Inject gasoline or kerosene into the water jacket of the cylinder block and cylinder head, and check for leakage after half an hour.

(4) Air pressure test: When the air pressure test is used for inspection, the cylinder head must be immersed in human water, and the location of the cracks should be checked from the bubbles emerging from the water surface. You can use compressed air of 138 ~ 207 kPa to pass through the channel to be inspected, keep the pressure for 30 s, and check whether there is air leakage during this time.