Are exhaust manifold bolts hard to remove?
Removing exhaust manifold bolts is often a lengthy, difficult and frustrating task. The nuts securing the bolts rust easily and as they are usually placed in inaccessible areas, it’s very hard to remove them.
How tight should exhaust manifold 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.
Should I Loctite my exhaust manifold bolts?
I would not use a loctite product on the exhaust manifold bolts. The small block chevy has a similar problem with it’s exhaust manifold bolts. The trick thing to do is use a locking tap washer similar to the small block chevy design on the Buick V6.
Should you put anything on exhaust manifold 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.
Should I 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.
What can be done to prevent bolts from cracking?
The only solution to preventing hydrogen embrittlement from occurring is to replace fasteners as soon as they crack due to overstressing. Another solution could be altering the bolts’ atmosphere to ensure that they are free of the anodic solvents and chemicals that cause hydrogen embrittlement.
Can a stud walk out of an exhaust manifold?
Properly installed and torqued studs with nuts are loosening themselves… The nut is staying in the position it was tightened to, but I’ve had the stud itself walk out multiple times now. It tightens in nicely and will be fine for several weeks.
What kind of stress can cause a bolt to break?
Bolts experience three types of stress: Tensile load, the most important stress, is static stress that pulls both ends of the bolt separately. If this load is overapplied to the bolt, it can cause a shift in the load-bearing capabilities and ultimately cause bolt breakage.
What causes the efficiency of bolts to decrease?
In simple terms, the bolts experience a significant amount of fatigue during their lifetime which causes their efficiency to gradually decrease. Like overstressing, fatigue can also be tied to preload and service load.