How does the car check the cam height of the camshaft

How does the car check the cam height of the camshaft? The following camshaft wholesales, camshaft manufacturers and camshaft brand companies are as follows:
(1) Clean the oil on the surface of the camshaft cam.
(2) Use a micrometer to measure the highest point of the cam lobe. To measure, measure the cam height in two positions by moving it back and forth while adjusting the bayonet width of the micrometer until a slight resistance is felt.
(3) If the cam height exceeds the limit (the cam height is lower than the limit value, the cam is worn out), replace the camshaft.

The following camshaft wholesale, camshaft manufacturers and camshaft brand companies will introduce the relationship between crankshafts and camshafts.
(1) The upper camshaft is placed on the cylinder head, which is commonly used in passenger car engines. Main advantages: less moving parts, short transmission chain from camshaft to valve, high rigidity of Custom 4-cylinder dual VVT camshaft the whole mechanism, suitable for high-speed engines. The main disadvantage is that the transmission distance between the camshaft and the crankshaft is long, and the toothed belt drive or chain drive is generally used.
(2) The central camshaft is located on the upper part of the cylinder block. Compared with the lower camshaft type: the push rod is reduced (or the push rod is shorter), thereby reducing the reciprocating mass of the valve train, increasing the rigidity of the mechanism, and being more suitable for high-speed engines.
(3) The lower camshaft is located in the crankcase. Main advantage: The camshaft is closer to the crankshaft and is generally driven by a pair of gears. Main disadvantages: many moving parts, long transmission chain from camshaft to valve, poor rigidity of the whole mechanism, mostly used in low-speed engines.

The camshaft is a component in a piston engine that controls the opening and closing of the valve. The materials used to make camshafts are generally nodular cast iron, alloy cast iron, chilled cast iron, and medium carbon steel. Ductile iron is a cast iron with spheroidal graphite obtained by spheroidizing molten iron close to the composition of gray cast iron by magnesium or magnesium alloys or other nodularizing agents. Graphite is spherical, which greatly reduces the splitting and sharp effect of graphite on the matrix. Ductile iron has high strength, wear resistance, oxidation resistance, shock absorption and small notch sensitivity.
The front end of the engine is on the maintenance workbench, remove the timing gear with a protective cover, and then loosen the timing gear pulley of the camshaft. Then the mark on the timing belt pulley of the camshaft should be aligned with the mark on the protective cover of the timing belt, and the crankshaft should be rotated until it reaches the first cylinder. Then loosen the semi-automatic tensioner and remove the timing belt from the camshaft. Then remove the valve cover and the timing belt pulley of the camshaft, and then remove the semicircular key from the camshaft.
When installing the camshaft, first replace the oil seal, and the cam of the first cylinder should face upward; when installing the bearing cap, the upper and lower holes should be aligned; the bearing surface of the lubricated camshaft should be tightened alternately diagonally. After the camshaft is installed, it will start running after 30 minutes, which is convenient for the compensation element of the hydraulic tappet to enter the state as soon as possible.