Differences
This shows you the differences between two versions of the page.
| Both sides previous revision Previous revision Next revision | Previous revision Last revision Both sides next revision | ||
|
techtalk:evo:engmech03a [2019/08/04 14:18] hippysmack [Using a pipe wrench to loosen the stud] |
techtalk:evo:engmech03a [2021/07/18 06:11] hippysmack [Loose Head Bolt Studs] |
||
|---|---|---|---|
| Line 4: | Line 4: | ||
| ====== Cylinder / Head Bolt Issues and Repair ====== | ====== Cylinder / Head Bolt Issues and Repair ====== | ||
| ===== Sub Documents ===== | ===== Sub Documents ===== | ||
| - | See also [[techtalk:evo:engmech03b|Time-Sert Repair on Engine Case Cylinder / Head Stud Hole]] in the Sportsterpedia for cylinder / head stud repair. | + | See also in the Sportsterpedia: |
| - | + | * [[techtalk:evo:engmech03b|Time-Sert Repair on Engine Case Cylinder / Head Stud Hole]] | |
| + | * [[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. \\ | ||
| Line 13: | Line 13: | ||
| With the bolts loosening, it is at least suspect that the threads or the hole strength is compromised. ((Hippysmack of the XLFORUM http://xlforum.net/forums/showthread.php?t=2074117&page=2)) \\ | With the bolts loosening, it is at least suspect that the threads or the hole strength is compromised. ((Hippysmack of the XLFORUM http://xlforum.net/forums/showthread.php?t=2074117&page=2)) \\ | ||
| - | | Weakest head stud holes in the case. ((photo by Hippysmack)) | | + | | Weakest head stud holes in the case. ((photo by Hippysmack)) | Head bolt pulled out of the case. ((photo by Blue Scoot of the XLFORUM http://xlforum.net/forums/showthread.php?p=5793625)) | |
| - | |{{:techtalk:evo:engmech:weakest_cylinder_bolt_threads_by_hippysmack.jpg?direct&300|}}| | + | |{{:techtalk:evo:engmech:weakest_cylinder_bolt_threads_by_hippysmack.jpg?direct&300|}}|{{:techtalk:evo:engmech:head_bolt_pulled_out_by_blue_scoot.jpg?direct&300|}}| |
| There is a procedure in the manual for tightening the studs before installing the cylinders and heads. \\ | There is a procedure in the manual for tightening the studs before installing the cylinders and heads. \\ | ||
| Line 25: | Line 25: | ||
| 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. \\ | ||
| Line 85: | Line 85: | ||
| |{{:techtalk:evo:engmech:removing_cylinder_stud_with_pipe_wrench_by_blue_scoot.jpg?direct&300|}}| | |{{:techtalk:evo:engmech:removing_cylinder_stud_with_pipe_wrench_by_blue_scoot.jpg?direct&300|}}| | ||
| - | ==== Using Double Nuts ==== | + | ==== Using Double Nuts / Jam Nuts ==== |
| + | Install 2 nuts on the top threads and torque the two nuts to 35ft pounds or higher. \\ | ||
| + | Be aware the tall studs can stretch if it takes too much torque to break them free. \\ | ||
| + | Be sure to use rags around the bore so as to not get any debris in the engine while removing the stud(s). \\ | ||
| + | |||
| + | | 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|}}| | ||
| + | ===== 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 ===== | ||
