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Procedures and tightening of carving connections

Tightening most of threaded connections should be made with the efforts defined by requirements of Specifications, cited at the beginning of each chapter of the Guidelines (under the force of a tightening of fixture to be understood when it is applied to the tightening torque). The following tightening force will be referred to as torque fasteners. Tightening with excessive force can disrupt the integrity of the fixture, while nedotyagivanie it leads to a bad connection mating components. Bolts, screws and pins, depending on the material from which they are made and the diameter of the threaded portion, typically have well-defined allowable torques, many of which, as mentioned above, are shown in Specifications at the beginning of each chapter. Strictly adhere to the above recommendations for tightening torques applied on the car mounting. To tighten the fasteners are not mentioned in the Specifications should use the map below allowable torques. Values in the table are focused on fixture strength classes 2 and 3 (fixing a higher class permits tightening with great effort), in addition, it is understood that the delay is made of dry (with unlubricated thread) fasteners in steel or cast (not aluminum) part.

Located on the perimeter of any fasteners (such as the cylinder head bolts, oil pan, and a variety of covers), in order to avoid deformation of the details should be given and be tightened in the correct order. Order of a tightening of the fastener and the give is given in the Handbook. If the special order is not stipulated, in order to avoid the curvature component should follow the procedure below.

In the first stage all bolts or nuts must be tightened by hand. Further, each of them in turn should be to reach out for another full revolution, the transition odes one bolt / nut to another should be done in a diagonal order (cross-wise). Then, returning to the first bolt / nut, repeat the procedure in the same order, tightening fixture for another half-turn. Continue to operate in the same manner, tightening each bolt / nut this time a quarter turn in one go as long as they will not appear tightened with demanded effort. At the giving of fasteners as well should follow the above procedure, but in reverse order.