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techtalk:evo:engmech03a [2019/12/10 02:32] hippysmack |
techtalk:evo:engmech03a [2021/07/18 06:11] hippysmack [Loose Head Bolt Studs] |
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| See also in the Sportsterpedia: | See also in the Sportsterpedia: | ||
| * [[techtalk:evo:engmech03b|Time-Sert Repair on Engine Case Cylinder / Head Stud Hole]] | * [[techtalk:evo:engmech03b|Time-Sert Repair on Engine Case Cylinder / Head Stud Hole]] | ||
| - | * [[techtalk:ref:genmsr36#warped_or_damaged_thread_repair|Warped or Damaged Thread Repair]] | + | * [[techtalk:ref:tools023#warped_or_damaged_thread_repair|Warped or Damaged Thread Repair]] |
| ===== Loose Head Bolt Studs ===== | ===== Loose Head Bolt Studs ===== | ||
| A big concern about the studs becoming loose is the threads being stripped in the case. \\ | A big concern about the studs becoming loose is the threads being stripped in the case. \\ | ||
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| If a stud is backing out, it could have simply be from it being installed improperly to begin with. \\ | If a stud is backing out, it could have simply be from it being installed improperly to begin with. \\ | ||
| It is possible that the stud turned when the head cap nuts were removed. \\ | It is possible that the stud turned when the head cap nuts were removed. \\ | ||
| - | Heat plays a role in what happens to the studs / nuts also and can lock the cap screw tighter than the stud is to the case. | + | Heat plays a role in what happens to the studs / nuts also and can lock the cap screw tighter than the stud is to the case. \\ |
| So it is possible that the top nut was just tight to the stud before breaking loose. \\ | So it is possible that the top nut was just tight to the stud before breaking loose. \\ | ||
| First try and remove any studs that back out and check the threads in the case as well as the stud. \\ | First try and remove any studs that back out and check the threads in the case as well as the stud. \\ | ||
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| | Three jam nuts used here. ((photo by A 4 liter V8 eater of the XLFORUM http://xlforum.net/forums/showthread.php?p=4442041#post4442041))| | | Three jam nuts used here. ((photo by A 4 liter V8 eater of the XLFORUM http://xlforum.net/forums/showthread.php?p=4442041#post4442041))| | ||
| |{{:techtalk:evo:engmech:tightening_cylinder_-_head_studs_by_a_4_liter_v8_eater.png?direct&300|}}| | |{{:techtalk:evo:engmech:tightening_cylinder_-_head_studs_by_a_4_liter_v8_eater.png?direct&300|}}| | ||
| + | ===== Cleaning the Case Threads ===== | ||
| + | |||
| + | The threads on the head studs as well as in the case need to be clean and free of rust / debris and they need to be straight in order to obtain proper torque on the heads. \\ | ||
| + | |||
| + | The photos below are of before (L) and after (R) chasing the case threads with a 3/8"x16 tap. \\ | ||
| + | The dirty threads will add preload to the torque readings and can easily give false readings on the wrench which could affect head gasket performance. \\ | ||
| + | |||
| + | {{:techtalk:evo:engmech:head_bolt_threads_before_chasing_by_hippysmack.jpg?direct&300|}} ((photo by Hippysmack)) {{:techtalk:evo:engmech:head_bolt_threads_chased_by_hippysmack.jpg?direct&300|}} ((photo by Hippysmack)) \\ | ||
| + | |||
| ===== Stripped Case Threads ===== | ===== Stripped Case Threads ===== | ||
