Torque-to-Angle Indicator (Part Number TRQ-1) Fel-Pro® Head Bolts provide the most consistent clamping force possible.Damage to engine and cylinder heads can occur.
Previously installed Torque-to-Yield head bolts should never be reused. (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.) PermaTorque® head gaskets are made with top-quality materials and designed to remain resilient so they retain torque, so no retorquing is necessary.
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. This allows the gasket to “cold seal” so it won’t leak coolant before the engine is started. 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. Chances are too great that it has already exceeded its elasticity barrier and won’t spring back to properly seal the engine. It is recommend to never reuse a T-T-Y head bolt. 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. Once T-T-Y bolts are stretched beyond their yield zone, they become useless. It’s important to carefully follow the manufacturer’s tightening specification. Once they reach this zone, they spring back to provide a precise level of clamping force over the entire area of the gasket. These bolts are engineered to stretch within a controlled “yield zone”. T-T-Y head bolts are particularly common on engines using aluminum heads and/or multi-layer steel head gaskets. Head gaskets engineered for extra strength under punishing conditions. Standard for no-retorque head gaskets features premium coatings, facings and combustion armors. Gaskets provide the correct design for MLS-equipped vehicles and feature a unique aftermarket coating that accommodates less-than-perfect surface finishes. In addition, Fel-Pro offers the best gasket material and design for each application to ensure a perfect seal the first time, every time.
#6.5 TURBO DIESEL ENGINE HEAD TORQUE SPECS FULL#
Written by our technical experts, it covers a full range of sealing topics.įel-Pro® offers comprehensive coverage of virtually every engine repair opportunity, from complete rebuilds to the replacement of a single gasket or seal. While there, you can also sign up for email alerts for Inside Sealing, the Fel-Pro newsletter that helps you solve sealing challenges on popular domestic and import engines. It’s the place to learn and share “tricks of the trade,” find proper diagnosis and installation instructions, and enjoy easy access to parts reference. The “Fel-Pro Only” website gives countermen and technicians easy access to the latest Fel-Pro sealing information and updates, including:įind the most up-to-date torque spec listings in electronic format.į is your convenient source for advanced sealing
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