You asked: What is recommend to use on the threads of exhaust manifold bolts or studs?

If you are reusing exhaust manifold bolts (which we don’t recommend), apply a metal fortified anti-seize to your manifold bolts. If you’ve just removed the broken bolts and ready to complete the repair, chase the threads clean and use fresh OEM bolts for best results.

Why do exhaust manifolds use studs instead of bolts?

Studs provide the ability to obtain much more accurate torque values because the studs don’t twist during tightening as do bolts. Because the studs remain stationary during nut tightening, the studs stretch in one axis alone, providing much more even and accurate clamping forces.

Should you use anti seize on header bolts?

Anti seize is a good idea on header bolts in general, in my experience. Even steel in steel they tend to freeze up over time (if they don’t fall out, as they did to you). The advice to use some type of lock is also a good one.

Can you use copper grease on exhaust studs?

It is often used to help prevent seizing and corrosion at high temperatures in the automotive industry. Copper grease is effective within the temperature range of of – 40° to + 1,150° celsius making it an ideal choice for use on wheel nuts & bolts, flanges, studs and exhaust brackets to prevent seizing.

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Can you use regular bolts on exhaust manifold?

Are exhaust bolts special? Exhausts are not high stress areas so the bolts can be 8.8 or even softer. We used to use brass nuts on exhaust manifolds so the nut could be easily cut off in the unlikely event it seized. Grade 4.6, 4.8 or 5.8 should be all be fine.

Can you replace exhaust manifold studs with bolts?

Super Moderator. I agree, the bolts in place of studs and nuts would be okay. Be sure to observe the torque specs for the bolts, i.e. to be the same as the nuts on the studs. You dont want an exhaust manifold to be too tight – it interferes with the manifold expanding at a different rate than the head.

When 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.

Should you use anti-seize on o2 sensor?

Use anti-seize compound to coat on the sensor’s threads (some oxygen sensors have the anti-seize compound applied at the factory). … When there’s no torque value given for tightening the new oxygen sensor, treat it much like you would a spark plug. In other words, less is probably better here.

Do you use anti seize on exhaust studs?

If you are reusing exhaust manifold bolts (which we don’t recommend), apply a metal fortified anti-seize to your manifold bolts. If you’ve just removed the broken bolts and ready to complete the repair, chase the threads clean and use fresh OEM bolts for best results.

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Is anti seize high temp?

Protects metal parts from seizing and galling at temperatures up to 2400°F (1316°C).

How tight should exhaust manifold studs be?

Every vehicle has different levels of torque necessary to properly tighten its bolts. The standard is to use 20 to 30 foot-pounds of torque.

How do you torque exhaust manifold studs?

Use a small amount of anti-seize on the exposed threads that will be in contact with the nut. Install the exhaust manifold gasket and exhaust manifold. Install the washers and 12-point nuts and torque the nuts to 40 ft-lbs. Tighten in a sequence working from the inside to the outside as shown at right.