Why are there springs on exhaust bolts?

It’s there to prevent vibrations. They keep the exhaust sealed but allows the joints to flex under engine movement.

Can exhaust manifold bolts be reused?

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.

Why do exhaust bolts break?

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.

How tight should exhaust flange bolts be?

Registered. Using a long 1/2 inch swivel socket, tighten the top nut of the front cylinder head exhaust flange to 9-18 in-lbs (1-2 Nm). Tighten the bottom nut to 100-120 in-lbs (11.3-13.6 Nm). Final tighten the top nut to 100-120 in-lbs (11.3-13.6 Nm).

How tight should exhaust springs be?

According to aftermarket pipe manufacturer Starting Line Products, there should be a spacing of 0.040†to 0.050†between the center windings. This can be easily measured with a feeler gauge if you want to get a grasp of what this distance – between a 1/16 and 1/32 of an inch.

How tight should exhaust bolts 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. 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.