V10 Plug torque confusion.
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Elder User
Joined: May 2008
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V10 Plug torque confusion.
Alright, which one is it?
1999 F series service manual = 30ft.lbs.
2003 motorcraft guide = 11 ft. lbs.
Posts here = 14 ft.lbs.
Thanks,
and Hope I don't have to loosen and retorque....
1999 F series service manual = 30ft.lbs.
2003 motorcraft guide = 11 ft. lbs.
Posts here = 14 ft.lbs.
Thanks,
and Hope I don't have to loosen and retorque....
Elder User
Joined: May 2003
Posts: 858
Likes: 1
Lots of confusion on torque and anti-seize. When I did mine a week or so ago I set my wrench at 150in-lbs. When it clicked, I then did a SLIGHT tug. I used anti-seize also. I wouldn't think a 99 would survive 30ft-lbs.
Logistics Pro
Joined: Aug 2007
Posts: 3,974
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From: Millersburg, OH
I agree that 30 ft lbs is to high. I know krewat posted changes they did to the heads before going to a large thread count and one I think was to change torque (lower) at the factory during engine assembly.
I know the Haynes manual I have says 11 ft lbs (1999 - 2004 engine, 25 ft lbs 2005 +) but the workshop manual online says 71 - 106 in lbs (6 - 9 ft lbs)! That sounds way to low. I know when I did mine I went with 14 ft lbs and that just "felt right". I used anti-seize as well.
1999 F-Super Duty 250-550 Workshop Manual
I know the Haynes manual I have says 11 ft lbs (1999 - 2004 engine, 25 ft lbs 2005 +) but the workshop manual online says 71 - 106 in lbs (6 - 9 ft lbs)! That sounds way to low. I know when I did mine I went with 14 ft lbs and that just "felt right". I used anti-seize as well.
1999 F-Super Duty 250-550 Workshop Manual
FTE Leadership Emeritus
Joined: Jul 2002
Posts: 42,561
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From: Long Island USA
That service manual is WAY out there...
The spec in my 2001 manual is 11-14 ft/lbs, 14 for good measure. (14*12 = 168in/lbs)
Even the long-thread heads, still 11-14ft/lbs.
The torque is required to get a seal at the plug taper, it's not a stretch thing, or anything else.
I still don't believe the plug-fixer-guy who says 30ft/lbs... It IS a way to test your threads though...
The spec in my 2001 manual is 11-14 ft/lbs, 14 for good measure. (14*12 = 168in/lbs)
Even the long-thread heads, still 11-14ft/lbs.
The torque is required to get a seal at the plug taper, it's not a stretch thing, or anything else.
I still don't believe the plug-fixer-guy who says 30ft/lbs... It IS a way to test your threads though...
Lead Driver
Joined: Sep 2003
Posts: 5,844
Likes: 6
From: Albuquerque
So...I'm guessing you initially went with the 30ft.lbs?
Glad you came to FTE to verify...and all went well.
biz
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FTE Leadership Emeritus
Joined: Jul 2002
Posts: 42,561
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From: Long Island USA
The big thing that worries me with 30 ft/lbs is when the engine gets very hot, like from a heavy load over a long period of time, the plug could pull the threads when the head expands.
Aluminum expands more than the iron plug, if the plug is in there that tight, there's just that much more force pulling on those threads.
Aluminum expands more than the iron plug, if the plug is in there that tight, there's just that much more force pulling on those threads.
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FTE Leadership Emeritus
Joined: Jul 2002
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From: Long Island USA
Wow, I just checked my service manual - again.
In the Engine - 6.8L section, it says 71-106 in/lbs - that's only 6 to 8.83 ft/lbs!
In the Ignition section for 5.4/6.8, it says 11ft/lbs!
Well, I did it to 14ft/lbs anyway.
In the Engine - 6.8L section, it says 71-106 in/lbs - that's only 6 to 8.83 ft/lbs!
In the Ignition section for 5.4/6.8, it says 11ft/lbs!
Well, I did it to 14ft/lbs anyway.
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Elder User
Joined: May 2008
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I have the old '99 EVTM and it says 30ft.lbs. Must have been a change since then. I just did mine to 14 last night also. I had them tq'd to 30 ft.lbs. Damn EVTM, thats like the 4th thing that has been wrong on that CD so far. Guess I'll come here from now on.
