Torque Specifications - Knowing The Correct Torque
Torque Specifications – Knowing The Correct Torque

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Torque Specifications – Knowing The Correct Torque Is Very Important

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 a certain amount; 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, manufacturers determine the amount of torque; that is needed to stretch a bolt or stud the correct amount. Furthermore,  they include that torque specification; in their service documentation. It is important to note that most engine torque specs; require you to use a 30w engine oil. 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.

Consequently, 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; 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; to prevent corrosion and leaks.

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