Since the method of checking and adjusting the valve clearance of Volvo diesel engines involves a lot of professional knowledge and operation steps, I will provide a detailed and logical article according to the requirements of knowledge and experience articles to help readers understand and master this technology.
Volvo Diesel Check How to adjust valve clearance
1. Definition and function of valve clearance.
Valve clearance refers to the gap between the valve and the valve seat, usually 02～0.3 mm. The function of the valve clearance is to prevent the collision between the valve and the valve seat due to the increase in temperature during the operation of the diesel engine, and at the same time, it can also reduce the drag when the valve is seated.
Second, the valve clearance inspection method.
1.Cylinder-by-cylinder inspection method: Shake the crankshaft to the top dead center position of the compression stroke, and check the valve clearance of each cylinder separately. In this case, you can check it with the mark on the flywheel or crankshaft pulley.
2.Twice unscrewing method: first loosen the cylinder head or cylinder block fixing screw, then according to the direction of rotation of the crankshaft, twist the crankshaft at an appropriate angle, and then loosen the fixing screw, and observe the change of valve clearance at the same time. If the valve clearance increases, it means that there is a problem with the valve clearance of the cylinder.
3. Adjustment method of valve clearance.
1.Cylinder-by-cylinder adjustment method: Shake the crankshaft to the top dead center position of the compression stroke, use a feeler gauge or screwdriver to insert between the valve and the valve seat, and gently tap the feeler gauge or screwdriver until the clearance is suitable. Then use a wrench or screwdriver to adjust the screws to make sure the clearance meets the requirements.
2.Twice unscrewing method: first loosen the cylinder head or cylinder block fixing screw, then according to the direction of rotation of the crankshaft, twist the crankshaft at an appropriate angle, and then loosen the fixing screw, and observe the change of valve clearance at the same time. If the valve clearance becomes larger or smaller, use a wrench or screwdriver to adjust the screws until the clearance meets the requirements.
4. Precautions.
1.Before adjusting the valve clearance, it is important to ensure that the position markings of the crankshaft and camshaft are properly aligned.
2.When using a wrench or screwdriver to adjust the screws, twist them gently to avoid breaking the screws due to excessive force.
3.After adjusting the valve clearance, recheck that the position markings of the crankshaft and camshaft are properly aligned.
4.During operation, it is necessary to keep it clean and avoid debris entering between the valve and the valve seat.
5.Regularly check and adjust the valve clearance to ensure the normal operation and prolonged service life of the diesel engine.
The above are the detailed steps and precautions for the method of checking and adjusting the valve clearance of the Volvo Diesel engine. I hope it will be helpful to the majority of diesel engine users and maintenance personnel. In the actual operation process, if in doubt or encounter problems, it is recommended to seek the help of professional maintenance personnel.