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techtalk:evo:engmech03a [2019/08/04 14:18] hippysmack [Using a pipe wrench to loosen the stud] |
techtalk:evo:engmech03a [2024/01/03 20:54] hippysmack |
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====== 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. \\ | ||
The two side by side bolt holes on the right side in the pic below are each drilled into the opposing holes and tapped. \\ | The two side by side bolt holes on the right side in the pic below are each drilled into the opposing holes and tapped. \\ | ||
So each hole is depending, in part, of the strength of the other. \\ | So each hole is depending, in part, of the strength of the other. \\ | ||
- | 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 https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-motor-engine/sportster-motorcycle-motor-top-end/197474-leaking-head-gasket-loose-head-bolts/page2?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 https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-motor-engine/sportster-motorcycle-motor-top-end/198541-repairing-cylinder-studs-cases/page5#post4360678)) | |
- | |{{: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. \\ | ||
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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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This made removing the stud with an 18" pipe wrench easier the next day. \\ | This made removing the stud with an 18" pipe wrench easier the next day. \\ | ||
{{:techtalk:evo:engmech:stuck_cylinder_stud_removal_by_hippysmack.jpg?direct&300|}} ((photo by Hippysmack)) | {{:techtalk:evo:engmech:stuck_cylinder_stud_removal_by_hippysmack.jpg?direct&300|}} ((photo by Hippysmack)) | ||
- | |||
===== Stud Removal ===== | ===== Stud Removal ===== | ||
==== Using stud removal tools to loosen the stud ==== | ==== Using stud removal tools to loosen the stud ==== | ||
- | |||
|{{:techtalk:evo:engmech:bent_socket_ext_while_removing_cylinder_stud_by_hippysmack.jpg?direct&300|}}|{{:techtalk:evo:engmech:broken_stud_extractor_by_hippysmack.jpg?direct&300|}}|{{:techtalk:evo:engmech:damaged_cylinder_stud_while_removing_by_hippysmack.jpg?direct&300|}}| | |{{:techtalk:evo:engmech:bent_socket_ext_while_removing_cylinder_stud_by_hippysmack.jpg?direct&300|}}|{{:techtalk:evo:engmech:broken_stud_extractor_by_hippysmack.jpg?direct&300|}}|{{:techtalk:evo:engmech:damaged_cylinder_stud_while_removing_by_hippysmack.jpg?direct&300|}}| | ||
- | |||
==== Using a pipe wrench to loosen the stud ==== | ==== Using a pipe wrench to loosen the stud ==== | ||
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You just have to find a way to make the wrench bind against the stud. \\ | You just have to find a way to make the wrench bind against the stud. \\ | ||
- | |If the wrench doesn't grip, make it bind on the stud. ((photo by Blue Scoot of the XLFORUM http://xlforum.net/forums/showthread.php?t=2074117&highlight=head+gasket&page=6)) | | + | |If the wrench doesn't grip, make it bind on the stud. ((photo by Blue Scoot of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-motor-engine/sportster-motorcycle-motor-top-end/197474-leaking-head-gasket-loose-head-bolts/page6?t=2074117&highlight=head+gasket&page=6)) | |
|{{: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). \\ | ||
- | ===== Stripped Case Threads ===== | + | | Three jam nuts used here. ((photo by A 4 liter V8 eater of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/frame-mount-evo-sportster-talk-1986-2003-models/148266-building-a-90-inch-sledge-hammer/page11#post3236162))| |
+ | |{{: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 ===== | ||
These could be repaired with Heli-coils. \\ | These could be repaired with Heli-coils. \\ | ||
But the repair must be straight with no wobble when drilling. \\ | But the repair must be straight with no wobble when drilling. \\ |