A. Standard socket
Standard socket: a socket that conforms to the size specified by the national standard and is commonly used in the machinery manufacturing industry. The socket is mainly used to fix the bolts and nuts, and plays the role of assisting in fastening the bolts and nuts. There are two types of standard sockets commonly used for assembly and disassembly of diesel engine parts: hexagonal sockets and twelve-square sockets. According to specifications, there are standard sockets of 6mm, 8mm, 10mm, 12mm, 13mm, 14mm, 15mm, 16mm, 17mm, 18mm, 19mm, 21mm, 22mm, 24mm, 27mm, 30mm, 32mm, etc.
B. Extension rod
The extension rod is used in a limited space where ordinary wrenches cannot be manipulated, and its main function is to transmit torque to the socket. According to the actual assembly and disassembly space requirements, the length of the extension rod is variable. When in use, just connect the head of the extension rod to the tail of the socket.
A. Before and after use, check if the inner and outer surfaces of the socket and extension rod are clean and free of foreign objects, otherwise they need to be cleaned before use. And also check if there is damage. If yes, replace it in time
B. When assembling and disassembling diesel engine parts, correctly select the corresponding standard socket according to the thread specifications of the bolts to be assembled and disassembled. Otherwise it cannot be assembled and disassembled properly because of the incorrect selection of the socket. For example: M8 flange bolts use 10mm standard sockets; M8 hex head bolts use 12mm standard sockets.
C. The function of the socket is to transmit the torque from the wrench to the bolt or nut. When using it, put the tail of the socket on the square head of the wrench (or the square head of the extension rod, and put the tail of the extension rod on the square head of the wrench). Then insert the socket head into the corresponding bolt or nut. The wrench rotates to drive the socket, and the socket rotates to drive the bolt or nut, so as to achieve the purpose of fastening or loosening.
A. When tightening the cylinder head nut, it should be tightened gradually to the specified torque in several times, and according to the principle of crossing the middle first, then both sides, and diagonally. Uneven or unbalanced tightening of the cylinder head nuts will cause the plane of the cylinder head to warp and deform. If the nuts are tightened too much, the bolts will stretch and deform, and the body and threads will also be damaged. If the nuts are not tightened enough, it will cause Cylinder air leakage, water leakage, oil leakage, high temperature gas in the cylinder will also burn the cylinder head gasket.
B. The lock nut of the fuel injector should be tightened to the specified torque when installing the fuel injector. At the same time, tighten it repeatedly several times, do not tighten it at one time. If the lock nut of the fuel injector is tightened too much, the lock nut will be deformed, and the needle valve will easily be stuck. If it is too loose, it will cause the injector to leak. Oil, fuel injection pressure drops, poor atomization, fuel consumption increases
C. When installing the fuel injector assembly on the cylinder head of a diesel engine, pay attention that
(1) to clear the dirt such as carbon deposits in the fuel injector assembly mounting seat
(2)do not install the fuel injector assembly pressure plate backwards and
(3)the thickness of the steel pad must be proper
(4)to control the tightening torque of the pressure plate nut of the injector assembly. If the tightening torque of the pressure plate nut is too large, the valve body of the fuel injector will be deformed, resulting in the fuel injector being stuck and the diesel engine unable to work.