How to adjust the valve of Isuzu 4jb 1 engine?

Go to the top dead center of 1 cylinder and adjust the intake and exhaust of 1 cylinder, cylinder 2 and cylinder 3. The gap between cold inlet and outlet is 0.4; Then go to the top dead center of four cylinders and adjust the intake and exhaust of four cylinders, intake of two cylinders and intake of three cylinders. The cold gap is also 0.4.

According to the cylinder ignition sequence, the clearance between the intake valve and the exhaust valve of the cylinder can be adjusted after the piston of the cylinder is determined to be at the compression top dead center position; After adjustment, turn the crankshaft and gradually adjust the valve clearance of other cylinders according to this method.

Extended data:

The valve consists of a valve head and a stem. The valve head temperature is very high (intake valve 570~670K, exhaust valve 1050~ 1200K), and it also bears the pressure of gas, the force of valve spring and the inertia force of transmission assembly. Its lubrication and cooling conditions are poor, which requires the valve to have certain strength, stiffness, heat resistance and wear resistance.

Generally, the intake valve adopts alloy steel (chrome steel, nickel-chrome steel), and the exhaust valve adopts heat-resistant alloy (silicon-chrome steel). Sometimes in order to save heat-resistant alloy, the exhaust valve head is made of heat-resistant alloy and the valve stem is made of chromium steel, and then the two are welded.

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