So, knowing the correct torque specifications, car manufactures recommend, has to be followed.
Furthermore, manufactures include those torques, in their service documentation.
The most important thing is to have, the correct torque specifications, for the engine you are working on.
It is important to note that most engine torque specifications, require you to use a 30w engine oil. Also, some specialty fasteners, require a specific lubricant. It is important to know which lube, if any, the bolt requires and to use it when tightening it.
So, most people don’t realize that a bolt or a stud, acts like a big spring to hold parts together. It has to be stretched, in order to do its job. Even though there are tools to measure bolt stretch, most people do not own them. But, almost anyone who does mechanical work, will have a torque wrench.
So, a torque wrench really only, senses friction. This is why it is so important to know what, if any, lubricant the manufacturer specifies, for each fastener. It is also important to pull on the torque wrench, slowly and evenly, without any type of jerking motions. The most important thing is to have, the correct torque specifications, for the engine you are working on.
Find The Proper Torque Specifications; And Sequence, Before Removing Torque To Yield Head Bolts
Before removing T-T-Y head bolts, always allow the engine to fully cool. Removing the bolts while the engine is hot, can cause cylinder head warpage. T-T-Y bolts should be removed, in the reverse order of the sequence, of which they are installed. The head bolts should be loosened, in steps rather than all at once. Be sure to verify the torque specifications, and torqueing sequence, before you start.
Clean, oiled threads prevent binding, allowing for accurate and consistent torqueing. Be careful not to over-oil the bolts, especially if they are, threading into a blind hole. Too much oil will hydro-lock the bolt, and give false torque readings. Finally, any bolts that pass through a water jacket, must have a sealer applied to the threads. Consequently, to prevent corrosion and leaks.
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