Yuchai YC6A Series, Руководство по эксплуатации и техническому обслуживанию

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气缸体后端面与正时齿轮室盖形成正时齿轮室，室内装有正时传动齿轮，机油泵由下部
中间齿轮传动。正时齿轮室盖与减振皮带轮上打有相应的刻度标志，用来检查供油正时和配
气正时。
The rear end of the cylinder block and timing gear chamber cover forms the timing gear
chamber with timing transmission gear in it and the oil pump is driven by the lower middle
gear. Corresponding scale marks are printed on the timing gear chamber cover and vibration
absorbing belt pulley to check the fuel supply timing and air distribution timing. .
气缸体的下部装有储存润滑油的油底壳。根据不同的配套需要，按材质分为铸铁和薄钢
板冲制两种，根据用户对倾斜度的不同要求，油底壳的式样也各有不同。油底壳垫片为耐油
橡胶制成，安装油底壳时紧固螺栓拧紧力矩按表二规定，力矩过大反而会使垫片压裂，并注
意按对角交叉次序逐渐拧紧紧固螺栓。油底壳底部安装有放油螺塞供更换机油时放油用。
The oil pan storing lubricating oil is at the bottom of the cylinder block. There are two
types of oil pans according to the matching requirement: cast iron and thin metal sheet
punching. The oil pan types are different depending on various gradient requirements of the
users. The gasket is made of oil resistance rubber. Refer to Table 2 for bolt tightening torque
when installing the oil pan. The gasket will cracks if too large torque is applied. Tighten the
bolts gradually according to the cross angle order. Oil drain plug is installed at the bottom of
the oil pan to drain the oil when replacing the oil.
3.2 气缸盖与配气机构
Cylinder Head and Air Distribution Mechanism
3.2.1
气缸盖及缸盖罩
Cylinder Head and Cylinder head cover
气缸盖 Cylinder head cover
气缸盖 气缸盖由合金铸铁材料制成，三缸合用一盖，每缸均匀分布缸盖螺柱
14
只，总共
26
只，中央两只螺柱（螺栓）两缸盖共用。由于气缸盖螺柱（螺栓）所受预紧力矩较大，为减少
变形，保证密封可靠，对气缸盖螺柱（螺栓）拧紧力矩的大小及拧紧顺序应予严格控制，其最
后拧紧力矩为
230±20N·m
，注意应分三次均匀拧紧（图
2—1
）
Cylinder head
Cylinder is made of alloy cast iron and three cylinders use one head. There are 14 cylinder
head bolts on every cylinder head cover, and 26 altogether, the double screw bolt in middle
are common used by two cylinders. Because cylinder head bolt is under large pre-tightening
moment of force, in order to reduce distortion and ensure reliable seal, the tightening moment
of force and order of cylinder head should be controlled strictly, and the last tightening
moment of force is 230±20N·m. please pay attention to tighten for three times (Fig 2-1).
第一次 :80 ～ 90N·m First time, 80 ～ 90N·m