How does a stretch bolt prevent loosening?
In a bolted joint, tightening the nut actually stretches the bolt a small amount, like pulling on a stiff spring. This stretching, or tension, results in an opposing clamp force that holds the two sections of the joint together. If the bolt comes loose, this clamp force weakens.
What causes broken bolts?
As the name suggests, overstressing involves placing an unjustifiable load on bolts; this is one of the most common causes of bolt breakage. Preload, or the internal stress keeping the bolted joints intact. Service load, which is the external force of the joint material to exert separate stresses.
Do bolts back out?
“Most parts of a bolted joint will revert to shape after being released if the stress in the parts has not gone beyond their yield strengths. Some materials in the contact surface, such as paint, will most likely deform permanently,” he says.
What happens when you unscrew a belt tensioner?
The tensioner will rotate freely before it comes to a stop. When the spring-loaded arm comes to a stop, continue to turn the bolt until the bolt loosens. Once the bolt loosens from the spring-loaded arm of the tensioner, release the belt tensioner until it comes to a stop. Finish unscrewing the bolt with your fingers.
What’s the best way to loosen a tensioner?
If equipped with a tensioner screw, back off the tensioner screw. Then, push the alternator toward the other pulleys, loosening the belt. To loosen an NAI tensioner, loosen the locking nut or bolt, then back off the tensioner screw.
How do you remove a belt tensioner bracket?
Remove the other bracket bolts that hold the belt tensioner to the engine block. Use a ratchet and socket and turn the bracket bolts counterclockwise to loosen and remove the bolts from the belt tensioner bracket.
What kind of tensioner does bolting systems use?
Contact factory for details. 10 mm piston stroke The Bolting Systems MRT series manual return bolt tensioner incorporates unique quick-release bridge adaptation, and range of adapter kits provide maximum flexibility. Features a piston stroke limit, visible indicator.
What happens when a belt tensioner goes bad?
When the tensioner or tensioner pulley fails, the loss of tension can cause the belt and pulleys to make high-pitched rattling or chirping noises. If the pulley bearing completely fails, it can also cause a squealing or even a grinding noise.
If equipped with a tensioner screw, back off the tensioner screw. Then, push the alternator toward the other pulleys, loosening the belt. To loosen an NAI tensioner, loosen the locking nut or bolt, then back off the tensioner screw.
What happens when a bolt comes loose on a bolt?
This stretching, or tension, results in an opposing clamp force that holds the two sections of the joint together. If the bolt comes loose, this clamp force weakens. Loose bolts are not just an irritating nuisance.
How do you loosen a tensioner on an alternator?
To loosen an AI tensioner, such as an alternator, loosen the main mounting bolt, usually on the engine, and the locking bolt, usually on a bracket or arm. If equipped with a tensioner screw, back off the tensioner screw. Then, push the alternator toward the other pulleys, loosening the belt.