A periodic decrease in the level of antifreeze in the engine indicates a depressurization of the cooling system. There are many reasons for the manifestation of such a malfunction. And some of them, the most problematic, are associated with a faulty engine cylinder head.
Necessary
- - metal ruler,
- - a piece of conveyor belt - 1 m,
- - compressor,
- - a piece of organic glass - in accordance with the size of the cylinder head,
- - clamps - 4-6 pcs.
Instructions
Step 1
One of the most unpleasant moments for a motorist is considered to be such a phenomenon as the opening of the expansion tank plug, accompanied by a short-term release of coolant, not to mention its continuous squeezing out when it boils for a long time, although the engine temperature has not reached a critical level. This factor clearly indicates the penetration of gases into the water jacket of the cooling system.
Step 2
In order to thoroughly find out the cause of this malfunction, the cylinder head is dismantled from the engine and placed on a workbench. After which it is completely disassembled, up to the removal of the valves of the gas distribution mechanism from it.
Step 3
Further, the plane of the head, intended for docking with the engine through the gasket, is cleaned of carbon deposits and other blockages. At this stage, we recommend using a chemical cleaning method, a mechanical one is highly undesirable.
Step 4
The cleaned surface of the head is checked for distortions with the edge of a metal ruler. After placing a ruler on top along the length of the head, move it with your hands from one edge to the other, while carefully observing the lower edge of the ruler and the plane of the cylinder head. Any gaps detected at this point indicate that the head is behaving, usually due to engine overheating.
Step 5
To detect microcracks in the engine part under investigation, it will be necessary to make a similarity of a block head gasket from a piece of a conveyor belt, with the only difference that only holes for the combustion chamber are cut out in it.
Step 6
Then the made gasket is applied to the working surface of the cylinder head, organic glass, cut in the shape of the head, is placed on top of it, and this whole "sandwich" is compressed with clamps. After that, the holes are tightly sealed in the place intended for attaching the pump, and a hose connected to the air compressor is put on the fitting for the heater outlet.
Step 7
The head prepared in this way is placed in a bath of clean water. Then the compressor is turned on and compressed air is injected into the water jacket of the checked part, within 1, 6 atmospheres. At this stage, the cylinder head is pressurized. Any air bubbles will indicate where the crack has formed in the head.
