What happens when bolts are tightened?
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’s the correct way to tighten a bolt?
Then hand tighten till they are snug against the flanges . If an air wrench is used make sure the pressure is set to the minimum. When tightening, always use the correct sequential bolt order for the flange. One final time – clockwise or counter clockwise sequentially around the flange.
Can a torque wrench be used to tighten head bolts?
One of the most common misconceptions about using a torque wrench to tighten head bolts is that the torque reading on the wrench indicates how much load is on each bolt. The reading on the wrench only tells you how much twisting force is being applied on each bolt.
What should I do if my bolt keeps spinning?
If the bolt and nut are spinning together, it’s time to crack the bad nut. Get a nut splitter from your local hardware store, or you can easily buy one online, and break the nut. Be careful not to apply so much pressure that you damage your work surface.
How are cylinder head bolts tightened on a Cylin der engine?
Tightening sequence. The cylinder-head bolts (e.g. 1- 10 on a 4 cylin- der engine, illustrated above) are to be tightened in a precisely defined sequence (see manufac- turer’s instructions). Like tightening torque and tightening angle, this sequence is specified by the engine and gasket manufacturers and depends on the individual engine design.
What happens if you tighten a bolt and it spins?
So you don’t have an issue “currently” with a spinning bolt. However, your bolt isn’t spinning because you have managed to over tighten it. This too can be harmful to whatever project you are doing. When you over tighten or over-torque a bolt you could strip the bolt or even snap the screw heads.
Where do you tighten the bolts on a car engine?
Each bolt tightening procedure always begins in the middle of the engine (between cylinder 2 and cylinder 3 – see example), moving in a spiral or crosswise direction outwards along both sides until the outer bolts on cylinder 1 and cylin- der 4 have been tightened.
One of the most common misconceptions about using a torque wrench to tighten head bolts is that the torque reading on the wrench indicates how much load is on each bolt. The reading on the wrench only tells you how much twisting force is being applied on each bolt.
Tightening sequence. The cylinder-head bolts (e.g. 1- 10 on a 4 cylin- der engine, illustrated above) are to be tightened in a precisely defined sequence (see manufac- turer’s instructions). Like tightening torque and tightening angle, this sequence is specified by the engine and gasket manufacturers and depends on the individual engine design.