Should you oil TTY bolts?

Using engine oil, lightly oil the threads and under the heads/washers on T-T-Y bolts unless otherwise specified by the vehicle service manual. Clean, oiled threads prevent binding, allowing for accurate and consistent torquing. Be careful not to over-oil the bolts, especially if they are threading into a blind hole.

Should head bolts be oiled?

Yes. For head BOLTS you always dip them in oil.

Can you reuse a TTY bolt?

Torque-to-yield (TTY) head bolts are designed to stretch when used. Once stretched, they are not as strong as before. Consequently, they cannot provide the same amount of clamping force and may break or shear off if reused.

What grade are TTY bolts?

The TTy bolts you will get from GM (or any pedders dealer) will be of the metric grade 10 variety, and they will have blue loctite on them. So yes, if you can find the exact same size bolts in a 10.9 locally, you can use them.

How can you tell if a bolt is TTY?

How are they identified? If a bolt is TTY, the final torque spec will list an angle in degrees rather than ft. -lbs.

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Should bolts be lubricated before torquing?

So, torque isn’t the true measure of bolt tightness—it’s tension. But lubrication on the bolt threads—and a whole host of other factors—can cause fluctuation in torque readings. So once you add a lubricant of any kind to the threads, all bets are off as to whether the same torque setting will truly secure the bolt.

Is it OK to reuse head bolts?

Can I reuse head bolts? … A head bolt should not be reused if the threads are galled or badly damaged. Chasing damaged head bolt threads with a die will clean up the threads but also remove material (metal) and undermine the head bolt’s ability to torque down and hold to specs.

What happens if you overtorque a bolt?

One of the most damaging ways to do that is by over-tightening, or over torquing the fastener. This can result in stripping screws, snapping screw heads and damaging pre-tapped threading.

Can you over torque a bolt?

Yes, you can over-tighten a bolt, but doing so is unlikely. Most bolts come with instructions that the bolt’s maximum torque. The ó-inch Power Bolt, for example, has a maximum torque of 25-foot pounds.

Where are TTY bolts used?

Used by many manufacturers, especially on engines with aluminum heads and in conjunction with Multi-Layer Steel (MLS) head gaskets, T-T-Y (Torque-To-Yield) head bolts are engineered to stretch within a controlled yield zone.

Can I replace torque to yield bolts with regular bolts?

With a standard bolt, a technician could torque the bolt to its yield point, and it would return to its original form and length when removed. It has elasticity; it can stretch and then return to its original form. 1. … At this point, the bolt cannot be reused and needs replacement.

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How many times can torque to yield bolts be used?

* Never reuse a torque-to-yield bolt. Because the bolts are designed to stretch once, stretching them a second time may stretch them beyond their yield point causing the bolt to break. They are one-time use bolts, so throw the old bolts away and buy new ones.

When did GM start using TTY head bolts?

GM started using TTY (Torque To Yield) head bolts in 1996 and they should not be reused. However, you should identify the bolts before reusing them.

What’s a TTY bolt?

A torque to yield fastener (TTY) or stretch bolt is a fastener which is torqued beyond the state of elasticity and therefore undergoes plastic deformation, causing it to become permanently elongated.

Are ARP bolts TTY?

No, ARP bolts are not torque to yield (TTY). TTY fasteners, when being torqued, actually stretch because of the elastic properties of the material. This gives them the needed clamping force, but the downside it that they aren’t reusable (well, at least they shouldn’t be reused).