What should I do if I can t take off the front crankshaft screw

When the crankshaft screw is rusty, it will not be removed, you can use the rust remover to remove the rust on it, and then remove the screw hard. If the nail cap is broken, you can punch a hole in the center of the screw to tap the reverse thread, and take it out with a special tap for breaking screws.

The professional dismantling method of crankshaft screw is that when disassembling the engine crankshaft pulley, first remove the plug, the engine disc to the top dead center of the first cylinder, use a special tool to screw it in from the screw hole, and use it to resist the simple number of balance weights of the first cylinder of the crankshaft, so that the crankshaft can not rotate, and then use a large torque wrench to remove the belt pulley bolts.

The crankshaft is an important part of the engine, it takes the force from the connecting rod and converts it into torque, which is output through the crankshaft and drives other accessories on the engine to work. The crankshaft is subjected to the centrifugal force of the rotating mass, the gas inertia force of periodic change and the reciprocating inertia force, so that the crank bearing is subjected to the action of bending torsional load. Therefore, the crankshaft is required to have sufficient strength and rigidity, and the surface of the journal needs to be wear-resistant, uniform and balanced.

Photo by Pacific Automobile Network Wu Jiaqi is red).

The crankshaft pulley screws can not be removed, which may be the cause of rust, and you only need to disassemble it hard, or add some kerosene to loosen the rust spots, and then you can disassemble it. Other methods of crankshaft screw removal: spray and soak with all-purpose anti-rust lubricant.

Loosen with an electric screwdriver. Loosen with a percussion screwdriver. If the nail cap is unscrewed, use a sharp spatula to pick the groove and then loosen it.

If the nail cap is broken, you can punch the reverse thread in the center of the nail and take it out with a special tap for breaking screws.

The crankshaft pulley screws cannot be removed, which may be the cause of rust, and you only need to disassemble it vigorously, or add some kerosene to loosen the rust spots, and then you can disassemble it.

1. Generally speaking, there is a spare screw hole at the lower position of the side of the cylinder block, which is generally close to the first cylinder, and is usually blocked with a plug; 2. The professional dismantling method is: when disassembling the engine crankshaft pulley, first remove the plug, the engine disc to the top dead center of the first cylinder, use a special tool to screw it in from the screw hole, and use it to resist the balance block of the first cylinder of the crankshaft, so that the crankshaft can not rotate, and then use a large torque wrench to remove the belt pulley bolts; 3. Non-professional dismantling method: use a large caliper with two grabs to jam the belt pulley, and then use a torque wrench to disassemble it, so that two people need to cooperate, but it is easy to disassemble the belt pulley.

Other methods of crankshaft screw disassembly: spray and soak with all-purpose anti-rust lubricant to loosen the rusty part.

Loosen with an electric screwdriver.

Loosen with a percussion screwdriver.

If the nail cap is unscrewed, use a sharp spatula to pick the groove and then loosen it.

If the nail cap is broken, you can punch the reverse thread in the center of the nail and take it out with a special tap for breaking screws.

The hardware tool store has special screw breaking tools for sale.

Photo by Pacific Automobile Network Q&A).