With gas mechanism in maintenance manual work , because the maintenance personnel technology and the understanding difference of the deviation, it is difficult to reach the maintenance quality requirements; So in the maintenance of special emphasis should be gas distribution mechanism maintenance quality, and take effective measures to improve maintenance quality, and to prolong the service life.

A. valve light ground: in the maintenance operations, such as the valve appear ablation, hemp dot and depression, all should be light on grinding (serious need to change the valve). Usually in the valve light on the ground, work should pay attention to the four questions: one is to ensure that the valve stem head and one, or should be first straightening; 2 it is light in the amount grinding mill can a complete under the premise of the cone smaller may be better; 3 is to improve surface finish; Four is the valve stem ends sag should be to wear away.

B. valve grinding: valve grinding into two kinds of circumstances, one is the valve and a only slight hemp dot, don't need light grinding and polishing when Ream; 2 it is with a valve are already after grinding and Ream light after grinding. The former use first rent grinding emery, hemp dot grinding away after another, with fine grinding emery, finally with oil grinding, until seal accords with a requirement, width so far in compliance with regulations. The latter only sealing can not reach the requested that the ground, but the operation to pay attention, don't be too hard, it is strictly prohibited to knock up and down) valve, otherwise will appear the concave shape sand mark, influence maintenance quality.

 
C. the valve seat Ream: valve seat ream usually for manual work, should be paid special attention to three problems: one is in depression, eliminate spots, can hinge on the basis of a complete cone, Ream quantity smaller may be more beautiful; 2 it is Ream hard to even, put the sword to the sword light, little hinge observe, in order to ensure that the less Ream quantity and high finish; Three is to try and valve with, make sure good face position and width. Position should be adjusted to the valve cone province, partial or offset in the mouth reamer, can be adjusted. Face width, into the valve can be mastered in the 0.9 mm (provisions for 1-2.2 mm), the exhaust valve can be mastered in 1.4 mm (provisions for 1.5 ~ 2.5 mm). The practice proved that the width in the valve and valve seat after grinding, the inlet valve up to 1 mm, exhaust 1.5 mm, all in the provisions of the width of the lower limit, can greatly improve the service life.
 



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