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1 一台五台山— 120型小四轮拖拉机更换了气缸盖后，进气门出现了漏气现象。机手另换一个气缸盖试验，漏气现象消失了，据此可断定问题出在气缸盖上，可能是气门座圈与气门导管内外径不同心或气门导管孔与气门座圈孔不同心造成的。机手先后更换气门座圈、气门导管检查，发现
1 A Wutai Mountain - 120 small four-wheel tractor replaced the cylinder head, the intake valve leakage has occurred. Another hand for the replacement of a cylinder head test, the phenomenon of leakage disappeared, it can be concluded that the problem lies in the cylinder head may be the valve seat and valve guide pipe diameter outside the heart or valve guide hole and valve seat hole is not caused by heart of. The hand has replaced the valve seat, valve guide inspection and found