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General Bobcat Skidsteer Forum
Bobcat 632 - Blown Head Gasket?
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<blockquote data-quote="Jyuma1" data-source="post: 123979" data-attributes="member: 22244"><p>There is a lot more involved in achieving proper torque then what first meets the eye. Sure, the average torque wrench will have scales in imperial and metric but that is only half the story. In order to achieve proper clamping force for head bolts, there is another consideration even more critical than setting the wrench to the desired value. Friction!</p><p></p><p>Follow the manufacturers recommendations relative to lubricating (or not) the threads and the bottom of the head of the bolt. Too much friction will lead to under torque and too little friction will lead to over torque. </p><p></p><p>The higher the torque value the more friction will exist that must be overcome before the bolt can tighten to the desired clamp force (or more accurately bolt stretch). For this reason, some manufacturers recommend an initial torque value that is much lower, followed by an additional angular value for the bolt to turn. For example: a manufacturer may specify an initial torque of 40-foot pounds followed by an additional 90 or 180 or 270 degrees of rotation. They sell tools with a built-in scale showing the additional degrees of rotation but most of the time it's easy enough to eyeball an additional 90 degrees or 180 degrees etc.</p><p></p><p>The bottom line... follow the manufacturers torque procedure, don't just set the value on the torque wrench and flail away. And one more thing... many guys have developed the bad habit of sneaking up on the "click" that many torque wrenches provide when the set value has been achieved, and then they release the pressure that provided the "click" and then repeatedly apply more pressure to produce the "click" again and again and again. This procedure does nothing but wear out the torque wrench, it does not produce a more accurate torque setting.</p><p></p><p>Proper torque procedure requires a steady uninterrupted motion right up to the "click" and that's it, further rocking around the "click" is a waste of time and ultimately detrimental to the torque wrench accuracy.</p></blockquote><p></p>
[QUOTE="Jyuma1, post: 123979, member: 22244"] There is a lot more involved in achieving proper torque then what first meets the eye. Sure, the average torque wrench will have scales in imperial and metric but that is only half the story. In order to achieve proper clamping force for head bolts, there is another consideration even more critical than setting the wrench to the desired value. Friction! Follow the manufacturers recommendations relative to lubricating (or not) the threads and the bottom of the head of the bolt. Too much friction will lead to under torque and too little friction will lead to over torque. The higher the torque value the more friction will exist that must be overcome before the bolt can tighten to the desired clamp force (or more accurately bolt stretch). For this reason, some manufacturers recommend an initial torque value that is much lower, followed by an additional angular value for the bolt to turn. For example: a manufacturer may specify an initial torque of 40-foot pounds followed by an additional 90 or 180 or 270 degrees of rotation. They sell tools with a built-in scale showing the additional degrees of rotation but most of the time it's easy enough to eyeball an additional 90 degrees or 180 degrees etc. The bottom line... follow the manufacturers torque procedure, don't just set the value on the torque wrench and flail away. And one more thing... many guys have developed the bad habit of sneaking up on the "click" that many torque wrenches provide when the set value has been achieved, and then they release the pressure that provided the "click" and then repeatedly apply more pressure to produce the "click" again and again and again. This procedure does nothing but wear out the torque wrench, it does not produce a more accurate torque setting. Proper torque procedure requires a steady uninterrupted motion right up to the "click" and that's it, further rocking around the "click" is a waste of time and ultimately detrimental to the torque wrench accuracy. [/QUOTE]
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Bobcat 632 - Blown Head Gasket?
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