更换气门导管应注意的事项１．导管与气缸盖上的安装孔应有一定紧度。用手指将导管用力按人安装孔内，导管应能立稳，压入深度不应超过２毫米。若导管立不稳，说明紧度过大；若压入过深，说明紧度过小，工作时可能审动。２．有的导管（如１９５）外圆没有台肩，压入时要根... Replace the valve guide should pay attention to the matters 1. Pipe and cylinder head mounting holes should have a certain tightness. Use your fingers to push the catheter into the hole by force, and the catheter should be able to stand firm with a depth of no more than 2 mm. If the catheter instability, indicating the tightness is too large; if pressed too deep, indicating tightness is too small, may be working at work. 2. Some catheters (such as 195) without a shoulder outside the circle, when pressed into the root ...