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Published byAdrian Gillette Modified over 10 years ago
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What is a fastener? A device to locate or hold parts
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How do you remove a stuck fastener? PLS WD-40 Penetrating Oil Apply to threads and shock or vibrate the fastener to encourage the oil to penetrate Allow time for oil to work into threads
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How do you remove a stuck fastener? Use a six point wrench or socket Try to tighten slightly, then loosen An impact can help shock the fastener loose A strong impact will often break off the bolt
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How do you remove a stuck fastener? Heat can help loosen a fastener Too much heat can damage the fastener Too much heat can weaken the surrounding metal
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When do you use a new fastener? Damaged in any way Corroded Stretched Torque to yield bolt
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What is a torque to Yield Bolt? Most commonly used for head bolts
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What replacement fastener should you use? Same Length Same Diameter Same Thread Pitch Same Plating or Material Same hardness or GRADE Same weight
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Bolt Length and Diameter
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What replacement fastener should you use? Same Length Same Diameter Same Thread Pitch Same Plating or Material Same hardness or GRADE Same weight
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What replacement fastener should you use? Same Length Same Diameter Same Thread Pitch Same Plating or Material Same hardness or GRADE Same weight
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When do fasteners have to be the same weight? Any time the nut or bolt is on a rotating part Cooling fans Drive pulleys Flywheel or clutch or torque converter Lug nuts Drive shafts
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How do fasteners lock in place? Proper torque Lock washers Cotter pins Locking tabs Self locking nuts Thread locking compounds –Red LocTite © Blue LocTite © USE the BLUE unless specified. Red will not come off!
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Do not re-use Nylon locking nuts Cotter pins Nuts in critical locations such as connecting rod nuts
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What do you put on the threads? Anti-seize compound Lubrication Lock-tight Red? Blue? BLUE All the above require clean threads
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How can you clean, repair threads? Thread chasers Tap Die Thread file
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Tap Cuts internal threads in a hole or nut Extremely brittle Work back and forth using a tap handle
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Die Cuts external threads on a rod or bolt Will easily cross thread and ruin a bolt Thread file can help straighten damaged threads on a bolt
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What is torque? Torque is a twisting force Torque is used to make sure the bolt has the proper clamping force Too much force weakens the bolt Too little force allows parts to work loose
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What is torque?
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Ft Lbs vs Inch Lbs 12 inch lbs = 1 ft lbs 120 inch lbs – 10 ft lbs
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How to insure clamping force is correct #1 Look up specific torque value #2 Insure fasteners are the proper grade, length & finish #3 Clean all thread surfaces #4 Use the proper washer and only if specified #5 Install proper length bolt in hole. #6 Run bolts through to feel for rough or tight threads #7 Lubricate bolts consistently #8 Use a torque wrench that is appropriate (not on the end of the scale)
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Beam Type (Deflecting Beam)
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Dial type Dial Indicator
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Micrometer or Click Type
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run back to lowest setting between uses
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Calibration of Torque Wrench Do not use to break loose bolts Do torque past capacity of wrench Unscrew micrometer (click type) to lowest setting between uses Have calibration checked periodically
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What is torque to yield? Tighten to a specific torque Continue to turn the fastener just enough to cause it to begin to stretch Typically specified in degrees of rotation
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Be careful when using extensions indicated to true torque value when using an extension wrench. D = (A x T) ÷ (A + B) D = indicated Dial reading on torque wrench A = Length of torque wrench B = length of extension T = torque specified by manufacturer
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