2What is a fastener? A device to locate or hold parts As a repair technician you will become skilled at removing, reconditioning, replacing, and installing fasteners.An important skill to learn is how to remove a stuck fastener without breaking it off.(You will get lots of practice with this as a technician)
4How do you remove a stuck fastener? An easy treatment for stuck nuts and bolts is Penetrating Oil (like WD-40).Some brands work better than others, so ask what works and experiment on your own.Spray it on the threads and shock or vibrate the fastener (hit it with a hammer) to get the oil to sink in.You must allow time for oil to work into threads.I spray and shock a stuck bolt, then go work on another job for an hour or so to let the magic happen
5Remove a stuck fastener Remove a stuck fastener? (After spraying with oil and waiting for it to soak in.)Use a six point wrench or socket
6Remove a stuck fastener Remove a stuck fastener? (After spraying with oil and waiting for it to soak in.)You might also use a breaker bar with a 6-point socketBreaker bars are longer and stronger than ratchetsNever put a pipe on a ratchet handle to get more torqueIt will damage the gears in the head of the ratchet
7Remove a stuck fastener Remove a stuck fastener? (After spraying with oil and waiting for it to soak in.)Use a six point wrench or socketTry to tighten slightly, then loosenAn impact can help shock the fastener looseA strong impact will often break off the bolt
8What about using Vice Grips to remove a stuck bolt? Vice Grips (locking pliers) damage the head of a bolt or nut and make it MUCH more difficult to remove.Use Vice Grips to hold or grip objects.They should never be used as a wrench, or a socket.
9How do you remove a stuck fastener? Heat can help loosen a fastenerToo much heat can damage the fastenerToo much heat can weaken the surrounding metalNEVER heat fasteners red hot
10When do you use a new fastener? If it is damaged in any way such as:corrosion or stretched threadsAlways replace Torque to Yield bolts
11What is a torque to Yield Bolt? Most commonly used for head boltsThey are tightened (torqued) until they just begin to stretchThis provides a very consistent clamping load and helps keep an even sealing pressure for the head gasket
23These gauges can measure the diameter, pitch and bolt length
24What replacement fastener should you use? Same LengthSame DiameterSame Thread PitchSame Plating or MaterialSame hardness or GRADESame weight
25Always use the same plating or material as the original fastener Nuts and Bolts are not all the same.They must be compatible with the other metals they contactMany have special plating to resist corrosionThe material or plating will change the general torque (or tightening) value.
34How do fasteners lock in place? Proper torque is usually the only thing that keeps a bolt or nut from vibrating looseSometimes lock washers are used, especially when a light fastening torque is desiredOver-tightening a lock washer will ruin it’s ability to holdDo not any washers unless they were used by the manufacturer
35How do fasteners lock in place? Cotter pins, locking tabs, and self locking nuts are often used.You should replace these with new ones to ensure they do not fail