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Toyota's 4,500 crankshaft pulley screw is still anti-silk

Toyota's 4,500 crankshaft pulley screw is still anti-silk

Answer:

The crankshaft is the gas pressure from the piston rod group to the external output of torque. It is also used to drive the engine's gas distribution and other auxiliary devices. The crankshaft consists of the main shaft, which supports the crankshaft. Full support: the main shaft of the crankshaft is one more than the cylinder number. Strength, stiffness, reduced wear and tear; Diesel engines and most petrol engines are adopted. Non-full support: the main shaft of the crankshaft is less than or equal to the number of cylinders. The load is larger, shortening the total length of the crankshaft. Crank: consisting of a connecting rod journal and both ends of the shaft and the shaft neck. Common damage of the crankshaft: the bending of the surface of the shaft, the bending or distortion of the crankshaft, the crack is even broken.
The causes of bending and distortion (1) the main bearing clearance is too large, the engine works under the shock conditions such as explosion or overload, which makes the crankshaft vibrate excessively. (2) a few cylinders do not work or work unbalanced. The tension degree of the main bearing cover is inconsistent, making the crankshaft unevenly distributed. The main shaft of the cylinder block is the coaxial deviation. (5) when the operation is improper, the towing of the trailer is too strong. (6) the crankshaft is not reasonable, and there is no support for long time.
The crankshaft of repair The roundness of the crankshaft journal and the error of the cylinder are more than 0.01 ~ 0.0125 mm, and the grinding process should be done in the special crankshaft grinder. The radial circle of the crankshaft is no more than 0.04 ~ 0.06 mm. If you exceed 0.10 mm, you need to correct it. Method: cold pressing straightening method, percussion method Crack: magnetic crack detection, immersion method. The repair of the crank shaft crack Crack occurs when a non-stress area or crack does not extend, but can be repaired. The crack of the crankshaft should be replaced when the shaft of the crankshaft and the shaft neck etc. Correction of crankshaft bending: surface percussion method: this method is applied to the crankshaft of the bending quantity not greater than 0.30 to 0.50 mm. The ball hammer and pneumatic hammer are available.
Damage inspection Wear outside diameter micrometer. Examination of the crack (1) permeability oil tapping method: put clean the crankshaft of kerosene soak, then remove the crankshaft rub-up, sprinkle the powder surface and then along the axial percussion hammer crankshaft of working face, white powder, such as have obvious crack shape oil stains in the crack in it. (2) the magnetic testing method: using flaw detector magnetization parts, the parts crackle spread some magnetic powder may be produced, when the magnetic field lines through crack edge, magnetic powder will be adsorbed on the crack, so as to show the location and size of crack.

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