How to use the valve seat reamer

1. Use 45 reamer to ream out the 45-degree circular mosaic surface of the valve seat. When the pin is hinged, the valve should be loaded and unloaded several times, and the valve subsidence should be checked until it meets the requirements.

2. Insert the valve into the conduit, and gently tap it several times to ensure that the seat line trace printed on the valve insertion surface falls in the middle of the valve disc insertion surface. If it is on the upper side, use 15 degree reamer to hinge the valve seat tube.

3. Use a 45-degree reamer to gently hinge the pin for 2~3 turns to correct the socket line.

Extended data:

Technical requirements for valves and seats:

The valve and seat are paired and have strict sealing requirements. At the same time, after installation, the height (valve subsidence) from the valve on the end face of the valve disc to the bottom face of the cylinder head has certain requirements.

Therefore, the conical surface of the hinge valve (usually the single oblique angle of the conical surface is 45 degrees) should be smooth and bright, the width of the formed mouth line (sealing belt) should be consistent, and the upper and lower boundaries of the mouth line should be clear. The valve subsidence of S 195 diesel engine is1.275 ~1.825mm. When the valve is inserted into the valve guide and the valve disc is attached to the valve seat, the valve will

The service life of the upper valve will be shortened, which will increase the valve subsidence, increase the combustion chamber and reduce the compression ratio, thus affecting the performance. The sinking amount of the lower valve will be too small, and it may be that the valve collides with the piston top.