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GEN 2 (2017-2020) Ford F-150 Raptor Forums
Ford Raptor Engine Discussion and Performance Mods
Which plug should I go with Sp 550 or Sp578?
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<blockquote data-quote="costnsg" data-source="post: 1779695" data-attributes="member: 21742"><p>I am planning to change plugs on my 2017 Raptor with 95,000 miles. Manual indicates change after 100,000, so I'm about there. Unfortunately, the proper plug is a little confusing. My truck is stock, btw.</p><p></p><p>My manual supplement shows proper plug is SP-534. Online searching for ford parts and the local Ford dealer says SP594. My online searchs indicate the SP594 is a replacement for SP542 and SP578. So, is SP594 the proper plug? I haven't found SP594 mentioned on this forum.</p><p></p><p>Online and in this forum I have found advice to use 133 in-lbs to torque the plugs. I didn't find a torque value for the bolt holding the coil. </p><p></p><p>Anti-sieze is another variable, but after reading lots of back and forth about whether to use it, I am leaning toward not using. I expect the torque values are based on no lube. Lubed fasteners will definitely develop more bolt stress with the same torque versus dry, so I expect the same principles apply to a spark plug (probably screws into head a little further with lube vs without). </p><p></p><p>So, looking for confirmation to use SP594 plugs torqued to 133 in-lbs without anti-sieze. I'd also be interested in torque values for the small coil fasteners if someone has that, otherwise I'll try to be careful with them (not too tight).</p></blockquote><p></p>
[QUOTE="costnsg, post: 1779695, member: 21742"] I am planning to change plugs on my 2017 Raptor with 95,000 miles. Manual indicates change after 100,000, so I'm about there. Unfortunately, the proper plug is a little confusing. My truck is stock, btw. My manual supplement shows proper plug is SP-534. Online searching for ford parts and the local Ford dealer says SP594. My online searchs indicate the SP594 is a replacement for SP542 and SP578. So, is SP594 the proper plug? I haven't found SP594 mentioned on this forum. Online and in this forum I have found advice to use 133 in-lbs to torque the plugs. I didn't find a torque value for the bolt holding the coil. Anti-sieze is another variable, but after reading lots of back and forth about whether to use it, I am leaning toward not using. I expect the torque values are based on no lube. Lubed fasteners will definitely develop more bolt stress with the same torque versus dry, so I expect the same principles apply to a spark plug (probably screws into head a little further with lube vs without). So, looking for confirmation to use SP594 plugs torqued to 133 in-lbs without anti-sieze. I'd also be interested in torque values for the small coil fasteners if someone has that, otherwise I'll try to be careful with them (not too tight). [/QUOTE]
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GEN 2 (2017-2020) Ford F-150 Raptor Forums
Ford Raptor Engine Discussion and Performance Mods
Which plug should I go with Sp 550 or Sp578?
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