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FJR Motorcycle Forums
Technical & Mechanical Problems
Oh Shit! OMG.....now what?!
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<blockquote data-quote="Constant Mesh" data-source="post: 914653" data-attributes="member: 615"><p>Maybe what I've experienced is unusual but when I remove the sparks plugs they are almost always slightly loose. I tighten them to the recommended torque but they're never very tight at removal. Don't use anti-seize and don't see the need for it.</p><p></p><p>I usually tighten new plugs twice. I'll compress the new washer to the correct torque, loosen the plug and then tighten and torque again. I'll go 16K miles or so before removing the plugs so they usually stay in place for at least 20 months.</p><p></p><p>Don't know if spark plug threads are like bolt threads but the first three threads on a bolt carry almost 3/4 of the total clamping load. The first six threads carry 98% of the load.</p><p></p><p>"There is little point in having more than six threads in anything. Nuts with National Coarse threads typically have 5 threads in them, whereas nuts with National Fine threads have about 8 threads. Nuts are usually stronger than the bolts they are on, which is to say that the bolt will usually break before the nut strips."</p><p></p><p><a href="https://www.gizmology.net/nutsbolts.htm" target="_blank">https://www.gizmology.net/nutsbolts.htm</a></p></blockquote><p></p>
[QUOTE="Constant Mesh, post: 914653, member: 615"] Maybe what I've experienced is unusual but when I remove the sparks plugs they are almost always slightly loose. I tighten them to the recommended torque but they're never very tight at removal. Don't use anti-seize and don't see the need for it. I usually tighten new plugs twice. I'll compress the new washer to the correct torque, loosen the plug and then tighten and torque again. I'll go 16K miles or so before removing the plugs so they usually stay in place for at least 20 months. Don't know if spark plug threads are like bolt threads but the first three threads on a bolt carry almost 3/4 of the total clamping load. The first six threads carry 98% of the load. "There is little point in having more than six threads in anything. Nuts with National Coarse threads typically have 5 threads in them, whereas nuts with National Fine threads have about 8 threads. Nuts are usually stronger than the bolts they are on, which is to say that the bolt will usually break before the nut strips." [URL="https://www.gizmology.net/nutsbolts.htm"]https://www.gizmology.net/nutsbolts.htm[/URL] [/QUOTE]
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FJR Motorcycle Forums
Technical & Mechanical Problems
Oh Shit! OMG.....now what?!
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