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How to check the flatness of the car cylinder head

2022-11-14

 The engine cylinder head is installed on the top of the cylinder block as a component carrying the valve train, which seals the cylinder from the top and constitutes the combustion chamber. Since it is in contact with high temperature and high pressure gas, it has to bear a large thermal load and mechanical load. If the cylinder head is partially raised or warped and deformed, and the sealing between it and the upper plane of the body is destroyed, the typical failure phenomenon is continuous burning of the cylinder gasket and the following failure phenomena: water in the oil in the oil pan, oil in the oil The surface rises; there are air bubbles in the water tank; white smoke is emitted from the exhaust pipe; air bubbles are emitted from the joint surface of the cylinder head and the body; the compression feeling is not obvious when the crankshaft is rotated, and the locomotive is difficult to start. Therefore, the inspection of the flatness of the engine cylinder head is particularly important.
 
The steps to check the flatness of the cylinder head are as follows:
1 Preparation tools: knife edge gauge, feeler gauge, rag
2 Inspection tools Wipe the knife edge gauge and feeler gauge, wipe the cylinder
3 Start the measurement, and measure according to the position diagram. Note: Avoid the bolt holes when measuring.

4. By observing the gap between the knife edge ruler and the cylinder, the gap with the most light transmission is measured with a feeler gauge, and the maximum value that can be inserted is the flatness error of the plane.