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General Discussion
Excursions - Powerstroke
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<blockquote data-quote="zukkev" data-source="post: 1481129" data-attributes="member: 17121"><p>On the first gen (2valve heads), there are are a total of 4 threads holding the plug in---Yes, over-torqueing can be an issue, but not as bad as under-torqueing; the plug loosens up and vibrates around, beating the threads to their death, ultimately the plug ends up blowing out....requiring thread repair. These plugs were not a 2 piece design as stated earlier...The plug itself is almost never at fault in these... And it's not a niche market---anybody can buy a version of the repair kit for these...some work better than others though...And no, Ford has not come up with a better design; a replacement cylinder head will STILL only have 4 threads holding in the plug...</p><p>The later 3V heads got more meat around the threads of the plug, BUT these are the 2 piece plug design that almost always leave the lower portion in the head...The reason??? The lower section of the plug is in a chamber that has little clearance, carbon packs in around the plug bottom, and when you try to screw it out, the carbon locks the lower half into the head, ultimately separating the plug right at the base of the thread...Ford's latest plug design is STILL 2 piece...The ONLY manufacturer I have found to have a 1 piece design is CHAMPION, and their lower section is slightly smaller than motorcraft's leaving a little more distance between the plug and the bore.... and I have run them in the 3v heads with no issues...</p></blockquote><p></p>
[QUOTE="zukkev, post: 1481129, member: 17121"] On the first gen (2valve heads), there are are a total of 4 threads holding the plug in---Yes, over-torqueing can be an issue, but not as bad as under-torqueing; the plug loosens up and vibrates around, beating the threads to their death, ultimately the plug ends up blowing out....requiring thread repair. These plugs were not a 2 piece design as stated earlier...The plug itself is almost never at fault in these... And it's not a niche market---anybody can buy a version of the repair kit for these...some work better than others though...And no, Ford has not come up with a better design; a replacement cylinder head will STILL only have 4 threads holding in the plug... The later 3V heads got more meat around the threads of the plug, BUT these are the 2 piece plug design that almost always leave the lower portion in the head...The reason??? The lower section of the plug is in a chamber that has little clearance, carbon packs in around the plug bottom, and when you try to screw it out, the carbon locks the lower half into the head, ultimately separating the plug right at the base of the thread...Ford's latest plug design is STILL 2 piece...The ONLY manufacturer I have found to have a 1 piece design is CHAMPION, and their lower section is slightly smaller than motorcraft's leaving a little more distance between the plug and the bore.... and I have run them in the 3v heads with no issues... [/QUOTE]
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