Saturday, August 4, 2012

Complete Cylinder Head Torque Specifications for Domestic and ...

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Torque  Tables                      TM        Complete Cylinder Head      Torque Specifications          for Domestic and       Imported Passenger            Cars and Light/       Medium Duty Trucks                                         VEHICLE SEALING   When you consider what can go wrong when even "minor" gaskets fail, you realize one thing: THERE ARE NO UNIMPORTANT GASKETS! Each one, no matter how small, plays a critical role in vehicle sealing. Each has to be the best. That's why you should be... 100% Fel-Pro.       Why trust Fel-Pro gaskets for ALL of your vehicle sealing needs?    The undisputed sealing technology leader    Engineered for the repair environment    Molded rubber chemistry and     manufacturing expertise    Global engineering resources    Latest technology across every     gasket repair category                                                         DRIVETRAIN                             ENGINE REPAIR  FUEL SYSTEM                                                         EXHAUST SYSTEM                                        LEAK REPAIR    COOLING SYSTEM Engine Repair Fel-Pro offers comprehensive coverage of virtually every engine repair opportunity, from complete rebuilds to the replacement of a single gasket or seal. In addition, Fel-Pro offers the best gasket material and design for each application to ensure a perfect seal the first time, every time.     Engine Repair Technologies:   PermaTorqueMLS  These head  gaskets provide the correct design  for MLS-equipped vehicles and  feature a unique aftermarket  coating that accommodates  less-than-perfect surface finishes.    PermaTorque  The industry  standard for no-retorque head  gaskets features premium coatings,  facings and combustion armors.    PermaTorqueSD  Severe-duty  head gaskets engineered for extra  strength under punishing conditions.                                             I  Understanding Torque-to-Yield  Head Bolts  T-T-Y head bolts are particularly common on engines using  aluminum heads and/or multi-layer steel head gaskets.  These bolts are engineered to stretch within a controlled  "yield zone". Once they reach this zone, they spring back to  provide a precise level of clamping force over the entire  area of the gasket.  It's important to carefully follow the manufacturer's  tightening specification. Once T-T-Y bolts are stretched  beyond their yield zone, they become useless. Typically,  T-T-Y bolts are torqued to a specified limit, then again with  an additional partial turn to reach the bolt's yield zone.  It is recommend to never reuse a T-T-Y head bolt. Chances  are too great that it has already exceeded its elasticity barrier  and won't spring back to properly seal the engine.     II Importance of Proper Torque When a head gasket is installed between the cylinder head and engine block, tightening the head bolts compresses the gasket slightly, allowing the soft facing material on the gasket to conform to the small irregularities on the head and block deck surfaces. This allows the gasket to "cold seal" so it won't leak coolant before the engine is started. The head gasket's ability to achieve a positive cold seal, as well as to maintain a long-lasting, leak-free seal depends on two things: its own ability to retain torque over time (which depends on the design of the gasket and the materials used in its construction) and the clamping force applied by the head bolts. PermaTorque head gaskets are made with top-quality materials and designed to remain resilient so they retain torque, so no retorquing is necessary. (Some competitive head gaskets alleged to be "no retorque" can lose as much as 50 to 60% of their original torque after only 100 hours of service.)  Competitive Head Gasket:     PermaTorque Head Gasket:                                                                        III
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Source: http://www.tulleeho.org/1925/complete-cylinder-head-torque-specifications-for-domestic-and-2/

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