Yuchai YC6A Series, Руководство по эксплуатации и техническому обслуживанию

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pin hole, then knock it lightly with soft metal see if the piston and connecting rob move freely
and not to be clogged. Pay attention to check up the shaft orientation and opening clearances.
（
fig.2-12
）
连杆螺栓的拧紧力矩为
200±20N·m
，需分三次均匀拧紧，
The tightening torque of the connecting rod bolt shall be
200±20
N·m, and it shall be tightened in
three steps
第一次拧紧力矩：
60
～
80N·m
，
First tightening torque: 60
～
80N·m
，
第二次拧紧力矩：
(100
～
130)N.m
Second tightening torque: (100
～
130)N.m
第三次拧紧力矩：
(180
～
200)N.m
Third tightening torque: (180
～
200)N.m
上紧后应保证曲轴转动灵活，并检查连杆头端的轴向间隙。 连杆轴承的轴瓦是铜铅合金，
表面镀有铅锡铜三元合金，并镀有防蚀锡层。
The crankshaft shall rotate freely after tightening; check the axial clearance at connecting
rod end. The bushing of connecting rod is made of copper-lead alloy with lead-tin-copper
ternary alloy and corrosion resistance coat on the surface.
曲轴飞轮组由曲轴、飞轮、曲轴皮带轮减振器等组成。曲轴为球墨铸铁（部分增压机型
为铸钢）件，采用全支承结构，主轴瓦有七道，其材料与连杆轴瓦相同，曲轴中间档装有止
推片，防止曲轴前后窜动，必须保证曲轴轴向间隙为
0.1
～
0.3mm
（图
2—15
）。所有主轴承螺
母拧紧力矩力为 240±20N·m ，应按先中间后两端的次序分三次均匀拧紧。
The crankshaft flywheel consists of crankshaft, flywheel and crankshaft belt pulley vibration
absorber. The crankshaft is made of ductile cast iron (the part of engine with Turbocharger is
made of cast steel) with full support structure. There are 7 main bushing made of the same
material as connecting rod bushing; thrust is installed at middle of the crankshaft to avoid run
out of the crankshaft. The axial clearance of the crankshaft shall be 0.1
～ 0.3mm (Fig 2-15).
The tightening torques of all the main bearing nuts are 240±20N·m. They shall be tightened
for three times from middle first, then tighten the two end.
飞轮是以飞轮螺栓固定在曲轴后端的安装法兰上，拧紧时按对称位置分三次均匀拧紧，拧
紧力矩按表
1-6
规定。由于飞轮也是柴油机向外输出动力的联接件，根据不同厂家的配套，其
对外联接尺寸各异，具体联接尺寸以配套技术协议为准。
The flywheel is fixed on the flange on the crankshaft rear end with flywheel bolts; tighten it for