Diesel generator set engine fasteners nine assembly problem

Currently, some machine hand and repairman receive a driver's license or junior the repairman level certificate, but still very superficial understanding of the fundamentals of the structure and mechanical maintenance knowledge. Use a wrench to repair hard twist turn fasteners, or the hand the hammer hard percussion fasteners phenomenon often occur. As a result, after the installation of the diesel engine failure at work frequently, and some even cause a serious accident. The the diesel engine fastener installation considerations described below, in order to cause the majority of the machines hand and repair personnel great importance.

1 cylinder head nut. Tighten the cylinder head nuts should Fractional gradually screw tightened to the specified torque, and the first intermediate, after both sides, the principle of angular cross. Order to gradually loosen the the demolition cylinder should be required. If the cylinder head nut tight uneven or unbalanced will cause the cylinder head plane warpage. If the nut is tightened too much, the bolt tensile deformation of the body and the thread will be damaged. If the nut is not tight enough, will cause the cylinder leakage, water leakage, oil spills, the high temperature gas cylinder will burn cylinder head gasket.

2. Flywheel nut. S195 diesel engine flywheel and crankshaft is connected through the cone peace key. Installation, flywheel nut must be tightened and locking thrust washer hems. If the flywheel nut is not tight, the diesel engine work, will produce percussion, serious damage to the crankshaft cone shear rupture keyway wring crankshaft, causing serious accidents. Also note that the thrust washers angle can only pull fold.

3 rod bolts. The processing of high-quality steel connecting rod bolt withstand great impact in the work, can not use ordinary bolts instead. Tighten torque should be uniform, two connecting rod bolt to rotate a few times and gradually tightened to the specified torque, locking finally galvanized wire. If the connecting rod bolt tightening torque is too large, will bolt tensile deformed or broken, causing the pound cylinder accident; rod bolt tightening torque is too small, the bearing clearance increases percussion work and impact loads, or even bush-burning axle and connecting rod bolt break accident.

4 bolt main bearing. Should ensure the accuracy of the main bearing installation without loose. Tighten main bearing bolts (with full support of the four-cylinder crankshaft), five main bearings should be in accordance with the first, middle, after 2,4 Road, and then the order of 1,5 Road, 2 to 3 times evenly tightened to the specified torque. Tighten one should also check whether the crankshaft rotates normally. Main bearing bolt tightening torque is too large or too small harm, and connecting rod bolt tightening torque is basically the same too big or too small to harm.

Balanced block bolts. Balance block bolt installation should be sequentially several times and gradually tightened to the specified torque. Balance the block should situ refitted, or loss of balance.

Rocker seat nut. Nut rocker seat, in conjunction with in the course of maintenance to be regularly checked. The rocker seat nut loose cause the valve clearance increase, the valve opening delayed, shut down ahead of the valve opening continuation time, caused by the lack of diesel engine air supply and exhaust without a net decline in power, increases fuel consumption.

7. Injector locknut. The injector is installed, the locking nut should be screwed tight to the specified torque. The same time, it is best to repeatedly tightened several times, Do not tighten. Injector locknut overtighten locknut cause deformation, easy to make the needle valve stuck; If the screw is too loose will cause the injector oil spills, fuel injection pressure drops, poor atomization The increase in fuel consumption.

8 out of the oil valve tight seat. Install injection pump oil out of the valve tight seat, but also according to the specified torque. Oil valve tight seat overtighten will lead to deformation of the plunger sleeve, plunger in the sleeve block phenomenon, and cause early wear plunger, seal degradation, lack of power; if the oil valve tight seat is too loose will cause fuel injection pump oil spill, not the establishment of hydraulic oil supply time lag, reduce the amount of oil, and seriously affect the engine performance.

9 injector the platen nut. Diesel engine cylinder head installation fuel injector assembly, in addition to dirt attention to clear the fuel injector assembly mounts within the coke, the fuel injector assembly platen Do not hold against steel pad thickness should be appropriate and can not drain installation outside Also note that the the injector assembly platen nut fastening torque. If the the platen nut tightening torque is too large, it will cause the injector body deformation, leading to the fuel injectors stuck, the diesel engine does not work; tightening torque is too small, fuel injector will leak, resulting in a lack of cylinder pressure, the diesel engine starts difficult , high temperature gas will rush out to burn out the fuel injectors.

In addition, the distribution pump vane rotor, the distribution pump housing on the high-pressure tubing connector installation, spring prescribed torque.

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