Torque Specifications And What They Mean
Fel Pro Torque Guide
Without having the proper torque specifications, assembling an engine, or any threaded fastener as far as that goes, is just asking for failure. Most people do not 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 and really do not need them. But almost anyone who does mechanical work will have a torque wrench.
Bolts are elastic by nature, meaning that within their elastic range, they'll stretch as the load on the bolt increases. As long as the bolt is not stressed beyond its proof load the maximum load a bolt can withstand and still behave in an elastic manner , it will return to its original length once the torque is relieved. However, conventional bolts can be an issue when they are used on aluminum heads, given that the expansion rate of this type of head can stretch typical bolts past their yield point. This can be overcome by designing and offering better fasteners to address these conditions. Traditionally, a torque specification is a calculated number.
An all-new version of the popular Fel-Pro Torque Tables cylinder head torque specifications guide for engine rebuilders and underhood service professionals is now available from Federal-Mogul Corporation. The Fel-Pro Torque Tables guide has been aggressively expanded with over more engine applications than the previous guide and includes comprehensive cylinder head specifications and diagrams for domestic and global-nameplate engines up to and including the model year. Reflecting the extensively updated coverage of the Fel-Pro Master Gasket Catalog , the Torque Tables guide is an invaluable resource for any professional who services engines. Each application-based torque specification and diagram is based on research conducted by Federal-Mogul engineering teams. Fel-Pro Torque Tables presents up-to-date specifications and diagrams for each application rather than consolidating specifications for similar engine models.