What is the purpose of a bolt torque tightening procedure?
What is the purpose of a bolt torque tightening procedure?
The primary purpose of this procedure is to achieve the acceptable level of bolted flange joint integrity in the piping system & connection to equipment that have been identified & required tightening by bolt torque control. It is to be op erated & carried out for effective and safe operation.
How to tighten the main bearing cap bolts?
Tighten the main bearing and connecting rod bearing bolts. Tighten the main bearing bolts in two stages. Stage 1: 25 Nm. Stage 2: 60 degrees. Tighten the connecting rod bearing bolts in two stages. Stage 1: 35 Nm. Stage 2: 90 degrees.
What should the torque be to tighten a nut?
Ordinarily, the torque applied should not be outside of the 40-60% of minimum yield range. Tensioning – Tightening flanged joints in which an axial force is applied to the bolts causing them to stretch, at which time the nut is snugged and the load is removed. Bolt tensioning is carried out using a hydraulic stud bolt tensioner. 10 EQUIPMENT
Which is the correct torque sequence for a flange bolt?
Flange Bolt Torque Sequence. PASS 2: Torque to a maximum of 60% of the final torque value. PASS 3: Torque to the final torque value (100%). After the three basic torque passes are completed, repeat torquing the nuts at least once using the final torque in a “CRISS-CROSS” manner until no further rotation of the nut is observed. For easy handling,…
What should main bearing caps be torqued to?
Main bearing caps on 318 engines should be torqued to between 85 and 90 lb-ft., while 360 engines should be torqued to 85. The books also specify two different types (strengths) of main bearing cap bolts. They also specify a two-step torque procedure again, as well as a specific pattern to use (Image above).
What should intake manifold bolts be torqued to?
Intake manifold bolts on SBC engines should be torqued to 30 lb-ft in a two-step sequence. First time around, set your torque wrench to 20, follow the pattern, then repeat the pattern (image above) again after setting the wrench to 30. The image above shows the torque pattern to be used when reinstalling the heads on any SBC engine.
What should the torque be on a 302 engine?
If you’re putting together either a 289 or a 351, the rod bearing caps on these engines should be torqued to between 40 and 45 lb-ft. On the other hand, you’re going to need to be careful with the rod caps on the 302 engine as they are only supposed to be torqued to between 19 and 24 lb-ft.
What should the torque be on a 316 engine?
When rebuilding the 316 engine rod bolt-rod bearing cap torque should be set to between 45 and 50 lb-ft., This differs from 360 rod bolts that max out at 45. These should be done in two steps, doing both bolts/nuts to approximately 20 lb-ft first and then doing both to the final torque.
