Cooling System
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| 图 1 | g01366990 |
冷却系统示意图 (1) 缸盖 (2) 出口 (3) 水温调节器 (4) 旁通管道 (5) 水泵 (6) 进口 | |
本发动机具有压力式冷却系统。 压力式冷却系统有两个优点。 首先，冷却系统可以在高于水的正常沸点的温度下安全工作。 压力式冷却系统还可以防止水泵气穴。 气穴是指因机械力引起液体中突然形成低压气泡的现象。 对于压力式冷却系统，冷却系统内更难以形成气穴或汽囊。
在正常运行下，水泵 (5) 使冷却液流入缸体中。 冷却液经过缸体流入缸盖 (1) 中。 然后，冷却液会经过排水管流入水温调节器 (3) 的壳体。 当水温调节器 (3) 打开时，冷却液会从排水软管流向散热器。 随着冷却液流过散热器，冷却液将被冷却。 当冷却液到达散热器下端时，冷却液会经过入口软管流向水泵 (5) 。
发动机冷却后，水温调节器 (3) 将关闭。 冷却液不会流向散热器。 此时，冷却液将从水温调节器的壳体流经水泵 (5) 的软管。
注: 水温调节器 (3) 是冷却系统的重要组成部分。 水温调节器在散热器和旁通管道之间分流冷却液，以便保持适当的温度。 必须安装水温调节器 (3) 以便用机械方式控制该系统。 如果没有安装水温调节器，大多数冷却液将流经旁通管道。 如果没有安装水温调节器 (3) ，天气炎热时，发动机将会过热。 天气寒冷时，即使少量冷却液流经散热器，发动机也将无法获得工作温度。
Caterpillar Information System:
C4.2 and C6.4 Engines for Caterpillar Built Machines Air Inlet and Exhaust System
325C MHPU Mobile Hydraulic Power Unit Hydraulic Tank Screen - Clean
325C MHPU Mobile Hydraulic Power Unit Hydraulic System Oil Level - Check
325C MHPU Mobile Hydraulic Power Unit Hydraulic System Oil Filter (Pilot) - Replace
M315D2 and M317D2 Excavators Automatic Lubrication Grease Tank - Fill - If Equipped
325C MHPU Mobile Hydraulic Power Unit Hydraulic System Oil Filter (Case Drain) - Replace
330D Forest Machine Machine Systems Load Control Valve (Boom Cylinder) - Remove
568 Forest Machines Machine Systems Load Control Valve (Stick Cylinder) - Install
365C MHPU Mobile Hydraulic Power Unit Hydraulic System Accumulator (Pilot) - Test and Charge
325C MHPU Mobile Hydraulic Power Unit Hydraulic System Main Pump (Flow) - Test - Constant Horsepower Flow Control
325C MHPU Mobile Hydraulic Power Unit Hydraulic System Oil - Change
365C MHPU Mobile Hydraulic Power Unit Hydraulic System Main Pump (Flow) - Test - Constant Horsepower Flow Control
C4.2 and C6.4 Engines for Caterpillar Built Machines Fuel Injection Timing - Check
321D LCR Excavator Lifting Capacities
C4.2 and C6.4 Engines for Caterpillar Built Machines Fuel System - Prime
C4.2 and C6.4 Engines for Caterpillar Built Machines Air Inlet and Exhaust System - Inspect
C4.2 and C6.4 Engines for Caterpillar Built Machines Compression - Test
Filtration Procedure for Oil in the Motor Grader Tandem Drive {0680, 0738, 0768, 4062, 4064} Filtration Procedure for Oil in the Motor Grader Tandem Drive {0680, 0738, 0768, 4062, 4064}
2007/06/18 A New Idler Pulley Is Available for the Engine Pulley Group {1361}
2007/04/16 New Software for the Auxiliary Hydraulic Circuits Is Available {7610, 7620}
M313D, M315D, M316D, M318D and M322D Excavators and M318D MH and M322D MH Material Handlers Lifting Capacities - M316D Excavator with a Offset Boom (Heavy Lift Option)
C4.2 and C6.4 Engines for Caterpillar Built Machines Engine Oil Pressure - Test
C4.2 and C6.4 Engines for Caterpillar Built Machines Engine Oil Pump - Inspect
C4.2 and C6.4 Engines for Caterpillar Built Machines Connecting Rod - Inspect