Fasteners

Fasteners

Torque-to-Yield Fasteners

Some fasteners on the 4 cylinder and 6 cylinder engines are "torque-to-yield" fasteners. Torque-to-yield fasteners must be replaced whenever removed and require a torque angle meter in addition to a torque wrench for proper installation. Simply put, a "torque-to-yield" fastener is designed to stretch a certain amount upon correct installation. This is why they cannot be re-used. Once stretched in position, this action cannot be repeated.

One Time Use Fasteners

Some fasteners on the 4 cylinder and 6 cylinder engines are "one time use" fasteners. One time use fasteners have been identified by engineering as fasteners that must be replaced whenever removed.

Torque Angle Description

The process to use a torque angle meter tool is as follows. First, a specific torque is applied using a torque wrench. Next, a special angle of rotation(s) is applied using a torque angle meter tool. For example, the specification of 27 Nm (20 ft-lbs) + 60° + 30° means:

1. Use a torque wrench to tighten all bolts in sequence to 27 Nm (20 ft-lbs).
2. Then, use a torque angle meter to turn all bolts in sequence an additional 60°.
3. Finally, use a torque angle meter again to turn all bolts in sequence another 30°.

Do not short-cut this sequence by tightening to specification, then turning to 90° (60° + 30°) in one step. Tightening is done in steps for proper bolt stretching and clamping to take place.