Quick Answer: Should Bolts Be Lubricated Before Torquing?

Should head bolts be lubricated?

As a rule, the threads and underside of the head on most standard automotive head bolts should be lubricated with motor oil before the bolts are installed.

The torque values specified by the engine manufacturer are typically based on oiled threads and fasteners – not dry fasteners..

Will anti seize cause bolts to loosen?

Always use anti seize on spark plug threads and axle shafts. Some will say anti seize causes fasteners to loosen, this is NOT the case.

What happens if you don’t torque to spec?

Insufficient torque Engines that are running, tend to vibrate. … In the case of insufficient torque, it’s the stud or the bolt itself that suffers all the impact, causing it to shear. Alternatively, the engine’s vibrations can cause the bolt or nut to come undone, displacing the tensioner.

Is it OK to use never seize on lug nuts?

But experts tell us not to use any lubricant, including anti-seize compound, on wheel studs or nuts. The tech folks at Tire Rack state: “Torque specifications are for dry threads only. The fastener threads should be free of oil, dirt, grit, corrosion, etc. It is important NOT to lubricate hardware threads or seats.

Can I use grease instead of anti seize?

You can use grease quite effectively as an anti-seize compound. It’s not as good in high temperature applications, but there aren’t any of those on a bike. However, NEVER use anti-seize compound as a lubricant. … grease reduces the friction between two surfaces and allows them to pass over each other with less effort.

Should you Lube bolts before torquing?

Almost all threads should be lubricated. We use more penetrating spray for assembly than removal. We oil every bolt, no telling how much thread friction is adding to torque with dry threads and the idea of oil is to prevent dry seize. Most torque specs are rated for the use of light oil.

How does lubrication affect torque?

Lubricants ease the amount of torque required to get the bolt properly tight, so you use your energy more efficiently. … Lubricants make disassembly much easier and prevent rust and corrosion, which can permanently weld surfaces together.

Why is it important to use the proper bolt tightening sequence when torquing bolts on an engine?

Because the joint surfaces compress, tightening one bolt in the vicinity of another will affect the preload generated by the first bolt tightened. A good tightening sequence ensures that an even preload distribution is achieved in the joint (See Dia. A).

What happens if a bolt is over torqued?

Everyone who has ever worked with fasteners has accidentally messed one up at some point. 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.

What is the difference between wet torque and dry torque?

When applying torque to a dry bolt more friction is created than applying torque to a wet bolt with oil or other automotive fluids on the threads. With less friction (wet threads), the bolt will stretch more before a torque wench will click.

Is WD 40 anti seize?

WD-40 is hardly even a lubricant. Go to a marina supply store or good auto parts store or bike shop and buy ANTI SEIZE. It goes on like a paste.

Should you use anti seize on brake caliper bolts?

If you use it on caliper slides they will seize up and become frozen in place. They make dedicated brake lubricant, use that instead. … Anti-seize only belongs on threads that once tightened will probably not be loosened again for a long time.

What happens to a bolt when torquing?

Torque is the amount of energy it takes to spin the nut up along the threads of a bolt. … So, as the nut is turned (torqued) along the threads beyond this point, the steel gets pinched together between each end of the bolt assembly causing the bolt to stretch: E-L-O-N-G-A-T-I-O-N.

How do you calculate torque specs?

To determine torque yourself, follow the formula T = K x U x D x P, where T is torque, K is 1.33, U is the coefficient of friction, D is diameter and P is preload.

Where should you not use anti seize?

Do not use anti-seize as a lubricant such as on caliper slide pins or on threads for a bushing press or any mechanical assembly that requires a lubricant. Do not use anti-seize on exposed threads because the compound can attract contaminants that may contribute to thread damage when the fastener is removed.