33
joint if considered to be tightened it won't not be tightened. Nut runner system or torque spanner
will show the necessary torque but the necessary clamping torque will not be reached. At the
operation the threaded joint is influenced by the load, vibration that is why the risk ofslaking is
great. Friction coefficient can be lessened using oil, dry lubricant (hard wax), special coating for
thread.
2.8.11 Tightening torques of the threaded joints should comply with the design documents.
Maximal torques of the tightening which are not specified in the design documents should be
accepted according to OST37.001.050-73, minimal torques of the 3rd class should be accepted
according to OST37.001.031-
72: for М8 -11.76..17.65 N*m (1.2..1.8 kfg·m); for М10 -
23.53..35.30 N m (2.4..3.6 kfg·m); for М12 - 43.15…60.80 N*m (4.4..6.2 kfg·m); for М14 –
68.64...98.06 N*m (7.0...10.0 kfg·m).
2.8.12 If the group tightening of the threaded joints was not carried out process and
sequence of the tightening is performed according to the demands of the technological process of
this manual (fastening of the flywheel and the cylinder head). For the other parts tightening should
be carried out as cross-tightening beginning from above with the vertical location to avoid
drunkenness, deformation and to provide interface seal
of the joining parts.
2.8.13 Assembling the joints with force fit and press fit one should heat the external part
(gear hub of the crankshaft) to the temperature 180-200 degrees, and to cool the internal part
(valve sitting, cam bushing) in liquid nitrogen.
Attention!
Liquid nitrogen (temperature 196 degrees below zero) should be stored
Dewar flask, one should dip into the nitrogen dry parts without oil on the mandrel, because
moisture and oil cause splashing of the liquid nitrogen out of the flask that can cause skin burns.
2.8.14 Air used for the cleaning and blowing of the parts for the drive of the mechanical nut
runner should be dry and clean (to use the watersheds).
2.8.15 After the installation of the cylinder liner into the block it is necessary to check
protrusion of its clamp relatively to the joint face of the block, the dimension of protrusion should
not exceed the limits specified in the chapter Engine assembling. Measurements should be taken in
four points of the clamp perimeter.
2.8.16 Gripping of the pins of the cylinder head fasteners should be performed with the
torque 5-10 kfg*m. It is allowed to install the pins using the joint sealant NTS GOST
10277-76 mixed with the solvent 646. Water, oil entry into the holes under the pins is not allowed
because it causes destruction of the walls of the blind holes while snugging of the pins. Protrusion
of the pins above the nuts should be less than 12 mm.
2.8.17 Installing the crankshaft and crankshaft bearing caps one should comply with the
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