3056 Engines Caterpillar


Connecting Rod

Usage:

3056 8XJ
连杆有颜色代码。 颜色代码用以表示连杆长度 (Y) 。 请参阅表 1 以了解连杆的不同长度。


图 1g00915056

表 1
连杆的长度等级    
等级字母     颜色代码     长度 (Y)    
F     红    
165.728 至 165.761 mm (6.5247 至 6.5260 in)    
G     橙色    
165.682 至 165.715 mm (6.5229 至 6.5242 in)    
H     白色    
165.637 至 165.670 mm (6.5211 至 6.5224 in)    
J     绿色    
165.591 至 165.624 mm (6.5193 至 6.5206 in)    
K     紫色    
165.545 至 165.578 mm (6.5175 至 6.5188 in)    
L     蓝色    
165.499 至 165.532 mm (6.5157 至 6.4961 in)    

锯齿状连杆和扁平连杆




图 2g00884440

(1) 轴承连杆的内径 ... 38.89 至 38.92 mm (1.531 至 1.532 in)

(2) 铰孔后活塞销轴承的内径 ... 34.940 至 34.960 mm (1.3758 至 1.3765 in)

活塞销轴承的外径 ... 38.94 至 39.03 mm (1.535 至 1.536 in)

连杆小端轴承与活塞销之间的间隙 ... 0.023 至 0.044 mm (0.0009 至 0.0017 in)

(3) 活塞销中心与曲轴轴承中心之间的距离 ... 219.05 至 219.10 mm (8.624 至 8.626 in)

(4) 轴承可用于具有以下缩小尺寸的重新加工的曲轴轴颈:

  • 0.25 mm (0.010 in)

  • 0.51 mm (0.020 in)

  • 0.76 mm (0.030 in)

自然进气式发动机的轴承厚度 ... 1.835 至 1.842 mm (0.0723 至 0.0726 in)

涡轮增压式发动机的轴承厚度 ... 1.835 至 1.844 mm (0.0723 至 0.0726 in)

自然进气式发动机的连杆宽度 ... 31.62 至 31.88 mm (1.245 至 1.255 in)

涡轮增压式发动机的连杆宽度 ... 31.55 至 31.88 mm (1.2421 至 1.255 in)

自然进气式发动机的轴承间隙 ... 0.035 至 0.081 mm (0.0014 至 0.0032 in)

涡轮增压式发动机的轴承间隙 ... 0.030 至 0.081 mm (0.0012 至 0.0032 in)

(5) 轴承连杆的内径 ... 67.210 至 67.220 mm (2.6460 至 2.6465 in)

(6) 螺母

一些发动机可能配备将连杆盖固定至连杆的螺栓。

将连杆螺母拧紧至以下扭矩。 ... 125 N·m (92 lb ft)

将固定连杆盖的螺栓(如有配备)拧紧至以下扭矩。 ... 155 N·m (114 lb ft)

液压断裂式连杆




图 3g01064497

注: 连杆盖和连杆必须成对放置。

注: 更换连杆时,不要继续使用连杆螺栓。 必须使用新连杆螺栓。

连杆的配合表面是通过液力挤压锻造连杆形成的。

(7) 将连杆螺栓拧紧至以下扭矩。 ... 18 N·m (13 lb ft)

将连杆螺栓再次拧紧至以下扭矩。 ... 70 N·m (52 lb ft)

将连杆螺栓额外拧紧 120 度。

(8) 连杆轴承




图 4g01064498

(9) 活塞销孔的直径 ... 43.01 至 43.04 mm (1.693 至 1.694 in)

(10) 轴承中心间距 ... 219.05 至 219.10 mm (8.624 至 8.626 in)

(11) 连杆轴承孔的直径 ... 67.21 至 67.22 mm (2.6460 至 2.6465 in)

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