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techtalk:evo:engmech03a [2019/12/10 02:32]
hippysmack
techtalk:evo:engmech03a [2019/12/16 21:43] (current)
hippysmack [Stripped Case Threads]
Line 92: Line 92:
 |  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 =====