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第
12
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Page 12 of 50
气门导管的检查
Inspection of Valve Guide
测量每一根气门导管的内径，并作好记录。
Measure the inner diameter of each valve
guide, and record it.
维修极限值：
Maintenance limit values:
进气：
φ
5.025 mm
Intake:
φ
5.025 mm
排气：
φ
5.025 mm
Exhaust:
φ
5.025 mm
注意：
Note:
测量气门导管的内径前，应先将导管内的积碳
完全清除干净。
Before the inner diameter of valve guide
is measured, the carbon deposit inside
the pipe shall be completely cleared
away.
若气门导管磨损严重则需要更换缸头。
If the valve guide is heavily worn, the cylinder
head shall be replaced.
测量气门座接触面的宽度
Width Measurement of Valve Seat Contact
Surface
维修极限值：
1.5 mm
Maintenance limit value: 1.5 mm
如查气门座太宽、太窄或有凹痕，则应更换气门
及缸头。
If the valve measured is too wide, too narrow or
pitted, the valve and cylinder head shall be
replaced.
汽缸头的组装
Assembling of Cylinder Head
1
、
将气门弹簧下座、挡油罩装到气门导管上。
Mount the lower valve spring retainer and
oil shield onto the valve guide.
2
、
将进、排气门杆涂上润滑油后，装入气门导
管，装好气门弹簧、气门弹簧上座及气门锁
夹。
Apply lubricating oil on intake and exhaust
valve stems and mount them in the valve
guide; then mount the valve spring, upper
valve spring retainer and valve collet.
