Aerospace Cycling

All answers for Motorcycle



How To Install Motorcycle Exhaust Studs

How do I tighten my exhaust studs?

You can use a stud tool or use 2 nuts on the stud. Spin a nut onto the stud, then a second one to jam them together. Then use the “top” nut to tighten down.

How tight should exhaust manifold studs be?

What is the torque on exhaust manifold bolts? 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.

Are exhaust studs reverse thread?

It’s not reverse thread, and if you just keep tightning the nut, you will snap the stud or strip threads. Best way was already mention. Jamming two nuts on a stud, and using the inner one to back out the whole stud. Studs can be installed the same way.

Can you drive with broken exhaust manifold bolts?

Leaking exhaust would have no effect on air fuel ratio. It could slow the car down but mass air flow is still mass air flow. Broken studs won’t hurt anything.

Do I need to replace manifold studs?

In addition, we recommend replacing all of the bolts with OEM mounting bolts or studs. When you replace the manifold with a new one, it will be prone to the same warping that broke the bolt originally – so at the very least, be sure to replace all of the bolts with OEM mounting bolts or studs.

Why do exhaust bolts break?

Each duty cycle will provide tension stress on the studs or bolts that hold the manifold in place. This expansion and stretching of the manifold bolts over numerous duty cycles eventually causes too much tension on the bolt(s), stretching them beyond capacity and causing them to fail.

What do you put on exhaust bolts?

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.

Are exhaust bolts special?

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.

Do exhaust manifold studs need to be torqued?

it’s a stud, doesn’t need to be torqued down. Just tighten it to where it just bottoms out on the shoulder in the middle. then you torque down the nut and that will get everything tight. I think there was one nut where there was no way i could get a socket/torque wrench on.

Do exhaust manifold bolts need to be torqued?

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.

Do studs need to be torqued?

YOU ​MUST​USE A TORQUE WRENCH when installing the studs. Torque the stud itself between 22 & 25 ft/lbs (24 ft/lbs / 288 in/lbs / 32 Nm) into the hub. DO NOT OVER TORQUE ! This is only “hand tight” and is normal !.

What can a broken exhaust manifold bolt cause?

Exhaust Manifold Leaks Will Produce A Few, Failure Symptoms: Excessive engine noise. Decrease in power, acceleration, and fuel efficiency. Burning smell coming from the engine bay.

How hot does an exhaust manifold get?

In short, the highest temperatures that an exhaust manifold or exhaust pipe should ever reach would be approximately 850°C (1,600°F). As a guide, metals will start to turn red at 500°C and be a dark cherry red at around 635°C (1,175°F).

How often do manifold bolts break?

The passenger and driver exhaust manifold bolts let go at roughly 70,000 miles and we had them replaced by the dealership under warranty.

Can you reuse manifold studs?

You could reuse them, if you think they look good, but your chances of one breaking later have gone up now. I replace them every time, just heat the area around the studs, and melt a candle or crayon into the threads, let cool, they should come out easy, may need to heat again.

Can an exhaust manifold warp?

The exhaust manifold often warps and cracks, breaking off the studs between the cylinder head and the exhaust manifold. The noise may be most noticeable when the engine is cold.

What does an exhaust manifold leak sound like?

A leaking exhaust manifold will almost always create a ticking or tapping noise. Often, the sound is more pronounced upon startup when the engine and the manifold are both cold. The noise may diminish or disappear once the engine warms up and the manifold expands, closing off the leak.

What is the difference between screw and stud?

Screws and bolts have two forces applied on them: rotational force and linear force which would give an inaccurate torque reading. Studs have no rotational force applied, hence we can get more accurate reading.

Are screw in studs good?

Screw In Tire Studs are Great for Snow, Ice and Extra Traction. These removable screw in studs to will convert your tires to winter tires. They are a particularly good alternative when you do not have enough clearance on your equipment for tire chains. Ice studs can be removed and reused year after year.

What is difference between bolt screw and stud?

Bolts are usually defined as a threaded fastener intended to be mated with a nut, while a screw can engage either preformed or self-made internal threads. A stud is an externally threaded headless fastener.