How much torque does an exhaust manifold need?

How much torque does an exhaust manifold need?

The standard is to use 20 to 30 foot-pounds of torque. Older engines often fall on the lighter side of the equation, so use 15 to 20 foot-pounds of torque if your engine is 15 years old or older. Some manifolds house different sensors and plugs, such as a check valve or exhaust plug.

Do you need to torque exhaust manifold bolts?

Technically, it’s only necessary to tighten the manifold fasteners correctly. Some experienced mechanics can do that without a torque wrench. Many THINK they can do it without one, but are deceiving themselves.

Can torque-to-yield bolts be reused?

These bolts cannot and should not be reused due to the stress caused to the bolt during its first installation. It is important to be aware that these bolts will not have the same clamping strength if attempted to be used a second time. Torque-to-yield bolts may break if reused or become loose over time.

How do you know if a bolt is torque to yield?

You can identify a torque-to-yield or stretch-style fastener by the narrow shank just below the washer face and before the thread run. A bolt of this design is intended to be installed in the plastic range and cannot be reused after being tightened once.

Are all head bolts torque to yield?

They provide more consistent clamping loads, across the entire head-to-block mating surface. When a shop manual indicates that a bolt is to be discarded and new ones used; they are almost always torque to yield bolts.

Are ARP head bolts torque to yield?

ARP head bolts are made of a high tensile strength steel. So you would need to put twice as much torque on the bolt to actually get it to yield. ARP head bolts are made of a high tensile strength steel. They have an Fy of something like 180,000 psi where your typical steel building is only made of 50,000 psi steel.

Should you Lube bolts before torquing?

It depends on the application. When doing internal engine component torque (i.e.- connecting rod bolts), it’s common/advised to use an oil to lube threads.

Is it OK to grease bolts?

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.

What happens to a torqued bolt if the threads are not properly lubricated?

If that lubricant isn’t applied generously/properly, the dry parts of the fastener will increase your Nut Factor and result in different bolt loads on each of your fasteners.