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techtalk:evo:engmech03a [2019/08/04 14:48] hippysmack [Sub Documents] |
techtalk:evo:engmech03a [2019/12/16 21:43] hippysmack [Stripped Case Threads] |
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| 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. \\ | ||
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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 ===== | ||
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| + | 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. \\ | ||
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| + | 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. \\ | ||
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| + | {{: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 ===== | ||
